├── .github ├── CODEOWNERS ├── ISSUE_TEMPLATE.md ├── PULL_REQUEST_TEMPLATE.md └── workflows │ └── main.yml ├── .gitignore ├── .vscode ├── launch.json └── tasks.json ├── CONTRIBUTING.md ├── Finished ├── Delegates │ ├── AnonymousDelegates │ │ ├── AnonymousDelegates.csproj │ │ └── Program.cs │ ├── BasicDelegates │ │ ├── BasicDelegates.csproj │ │ └── Program.cs │ ├── Composable │ │ ├── Composable.csproj │ │ └── Program.cs │ ├── Composable2 │ │ ├── Composable2.csproj │ │ └── Program.cs │ └── DelegatesSolution │ │ ├── DelegatesSolution.csproj │ │ ├── Program.cs │ │ └── Shipping.cs ├── Events │ ├── BasicEvents │ │ ├── BasicEvents.csproj │ │ └── Program.cs │ ├── ChainedEvents │ │ ├── ChainedEvents.csproj │ │ └── Program.cs │ └── EventsSolution │ │ ├── EventsSolution.csproj │ │ └── Program.cs └── Lambdas │ ├── BasicLambdas │ ├── BasicLambdas.csproj │ └── Program.cs │ ├── LambdaDelegates │ ├── LambdaDelegates.csproj │ └── Program.cs │ └── LambdasSolution │ ├── LambdasSolution.csproj │ └── Program.cs ├── LICENSE ├── NOTICE ├── README.md └── Start ├── Delegates ├── AnonymousDelegates │ ├── AnonymousDelegates.csproj │ └── Program.cs ├── BasicDelegates │ ├── BasicDelegates.csproj │ └── Program.cs ├── Composable │ ├── Composable.csproj │ └── Program.cs ├── Composable2 │ ├── Composable2.csproj │ └── Program.cs └── DelegatesSolution │ ├── DelegatesSolution.csproj │ └── Program.cs ├── Events ├── BasicEvents │ ├── BasicEvents.csproj │ └── Program.cs ├── ChainedEvents │ ├── ChainedEvents.csproj │ └── Program.cs └── EventsSolution │ ├── EventsSolution.csproj │ └── Program.cs └── Lambdas ├── BasicLambdas ├── BasicLambdas.csproj └── Program.cs ├── LambdaDelegates ├── LambdaDelegates.csproj └── Program.cs └── LambdasSolution ├── LambdasSolution.csproj └── Program.cs /.github/CODEOWNERS: -------------------------------------------------------------------------------- 1 | # Codeowners for these exercise files: 2 | # * (asterisk) deotes "all files and folders" 3 | # Example: * @producer @instructor 4 | -------------------------------------------------------------------------------- /.github/ISSUE_TEMPLATE.md: -------------------------------------------------------------------------------- 1 | 7 | 8 | ## Issue Overview 9 | 10 | 11 | ## Describe your environment 12 | 13 | 14 | ## Steps to Reproduce 15 | 16 | 1. 17 | 2. 18 | 3. 19 | 4. 20 | 21 | ## Expected Behavior 22 | 23 | 24 | ## Current Behavior 25 | 26 | 27 | ## Possible Solution 28 | 29 | 30 | ## Screenshots / Video 31 | 32 | 33 | ## Related Issues 34 | 35 | -------------------------------------------------------------------------------- /.github/PULL_REQUEST_TEMPLATE.md: -------------------------------------------------------------------------------- 1 | 2 | -------------------------------------------------------------------------------- /.github/workflows/main.yml: -------------------------------------------------------------------------------- 1 | name: Copy To Branches 2 | on: 3 | workflow_dispatch: 4 | jobs: 5 | copy-to-branches: 6 | runs-on: ubuntu-latest 7 | steps: 8 | - uses: actions/checkout@v2 9 | with: 10 | fetch-depth: 0 11 | - name: Copy To Branches Action 12 | uses: planetoftheweb/copy-to-branches@v1 13 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | .DS_Store 2 | node_modules 3 | .tmp 4 | npm-debug.log 5 | bin/ 6 | obj/ 7 | -------------------------------------------------------------------------------- /.vscode/launch.json: -------------------------------------------------------------------------------- 1 | { 2 | "version": "0.2.0", 3 | "configurations": [ 4 | { 5 | // Use IntelliSense to find out which attributes exist for C# debugging 6 | // Use hover for the description of the existing attributes 7 | // For further information visit https://github.com/OmniSharp/omnisharp-vscode/blob/master/debugger-launchjson.md 8 | "name": ".NET Core Launch (console)", 9 | "type": "coreclr", 10 | "request": "launch", 11 | "preLaunchTask": "build", 12 | // If you have changed target frameworks, make sure to update the program path. 13 | "program": "${workspaceFolder}/Finished/Delegates/BasicDelegates/bin/Debug/net5.0/BasicDelegates.dll", 14 | "args": [], 15 | "cwd": "${workspaceFolder}/Finished/Delegates/BasicDelegates", 16 | // For more information about the 'console' field, see https://aka.ms/VSCode-CS-LaunchJson-Console 17 | "console": "internalConsole", 18 | "stopAtEntry": false 19 | }, 20 | { 21 | "name": ".NET Core Attach", 22 | "type": "coreclr", 23 | "request": "attach" 24 | } 25 | ] 26 | } -------------------------------------------------------------------------------- /.vscode/tasks.json: -------------------------------------------------------------------------------- 1 | { 2 | "version": "2.0.0", 3 | "tasks": [ 4 | { 5 | "label": "build", 6 | "command": "dotnet", 7 | "type": "process", 8 | "args": [ 9 | "build", 10 | "${workspaceFolder}/Finished/Delegates/BasicDelegates/BasicDelegates.csproj", 11 | "/property:GenerateFullPaths=true", 12 | "/consoleloggerparameters:NoSummary" 13 | ], 14 | "problemMatcher": "$msCompile" 15 | }, 16 | { 17 | "label": "publish", 18 | "command": "dotnet", 19 | "type": "process", 20 | "args": [ 21 | "publish", 22 | "${workspaceFolder}/Finished/Delegates/BasicDelegates/BasicDelegates.csproj", 23 | "/property:GenerateFullPaths=true", 24 | "/consoleloggerparameters:NoSummary" 25 | ], 26 | "problemMatcher": "$msCompile" 27 | }, 28 | { 29 | "label": "watch", 30 | "command": "dotnet", 31 | "type": "process", 32 | "args": [ 33 | "watch", 34 | "run", 35 | "${workspaceFolder}/Finished/Delegates/BasicDelegates/BasicDelegates.csproj", 36 | "/property:GenerateFullPaths=true", 37 | "/consoleloggerparameters:NoSummary" 38 | ], 39 | "problemMatcher": "$msCompile" 40 | } 41 | ] 42 | } -------------------------------------------------------------------------------- /CONTRIBUTING.md: -------------------------------------------------------------------------------- 1 | 2 | Contribution Agreement 3 | ====================== 4 | 5 | This repository does not accept pull requests (PRs). All pull requests will be closed. 6 | 7 | However, if any contributions (through pull requests, issues, feedback or otherwise) are provided, as a contributor, you represent that the code you submit is your original work or that of your employer (in which case you represent you have the right to bind your employer). By submitting code (or otherwise providing feedback), you (and, if applicable, your employer) are licensing the submitted code (and/or feedback) to LinkedIn and the open source community subject to the BSD 2-Clause license. 8 | -------------------------------------------------------------------------------- /Finished/Delegates/AnonymousDelegates/AnonymousDelegates.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | net5.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /Finished/Delegates/AnonymousDelegates/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace AnonymousDelegates 4 | { 5 | public delegate string MyDelegate(int arg1, int arg2); 6 | 7 | class Program 8 | { 9 | static void Main(string[] args) 10 | { 11 | // Implement an anonymous delegate 12 | MyDelegate f = delegate (int arg1, int arg2) 13 | { 14 | return (arg1 + arg2).ToString(); 15 | }; 16 | Console.WriteLine("The number is: " + f(10, 20)); 17 | } 18 | } 19 | } 20 | -------------------------------------------------------------------------------- /Finished/Delegates/BasicDelegates/BasicDelegates.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | net5.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /Finished/Delegates/BasicDelegates/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace BasicDelegates 4 | { 5 | // declare the delegate type 6 | public delegate string MyDelegate(int arg1, int arg2); 7 | 8 | class MyClass 9 | { 10 | // Delegates can be bound to instance members as well as 11 | // static class functions 12 | public string instanceMethod1(int arg1, int arg2) 13 | { 14 | return ((arg1 + arg2) * arg1).ToString(); 15 | } 16 | } 17 | 18 | class Program 19 | { 20 | // TODO: Create functions to serve as delegate implementations 21 | static string func1(int a, int b) 22 | { 23 | return (a + b).ToString(); 24 | } 25 | static string func2(int a, int b) 26 | { 27 | return (a * b).ToString(); 28 | } 29 | 30 | static void Main(string[] args) 31 | { 32 | MyDelegate f = func1; 33 | Console.WriteLine("The number is: " + f(10, 20)); 34 | f = func2; 35 | Console.WriteLine("The number is: " + f(10, 20)); 36 | 37 | MyClass mc = new MyClass(); 38 | f = mc.instanceMethod1; 39 | Console.WriteLine("The number is: " + f(10, 20)); 40 | } 41 | } 42 | } 43 | -------------------------------------------------------------------------------- /Finished/Delegates/Composable/Composable.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | net5.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /Finished/Delegates/Composable/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace Composable 4 | { 5 | // declare the delegate type 6 | public delegate void MyDelegate(int arg1, int arg2); 7 | 8 | class Program 9 | { 10 | static void func1(int arg1, int arg2) 11 | { 12 | string result = (arg1 + arg2).ToString(); 13 | Console.WriteLine("The number from func1 is: " + result); 14 | } 15 | static void func2(int arg1, int arg2) 16 | { 17 | string result = (arg1 * arg2).ToString(); 18 | Console.WriteLine("The number from func2 is: " + result); 19 | } 20 | static void Main(string[] args) 21 | { 22 | MyDelegate f1 = func1; 23 | MyDelegate f2 = func2; 24 | // Create a composed delegate from f1 and f2 25 | MyDelegate f1f2 = f1 + f2; 26 | 27 | int a=10; 28 | int b=20; 29 | 30 | // call each delegate and then the chain 31 | Console.WriteLine("Calling the first delegate"); 32 | f1(a, b); 33 | Console.WriteLine("Calling the second delegate"); 34 | f2(a, b); 35 | // Call the composed delegate 36 | Console.WriteLine("\nCalling the chained delegates"); 37 | f1f2(a, b); 38 | 39 | // subtract off one of the delegates 40 | Console.WriteLine("\nCalling the unchained delegates"); 41 | f1f2 -= f1; 42 | f1f2(b, b); 43 | } 44 | } 45 | } 46 | -------------------------------------------------------------------------------- /Finished/Delegates/Composable2/Composable2.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | net5.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /Finished/Delegates/Composable2/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace Composable2 4 | { 5 | // declare the delegate type 6 | public delegate void MyDelegate(int arg1, ref int arg2); 7 | 8 | class Program 9 | { 10 | static void func1(int arg1, ref int arg2) 11 | { 12 | string result = (arg1 + arg2).ToString(); 13 | arg2 += 20; 14 | Console.WriteLine("The number is: " + result); 15 | } 16 | static void func2(int arg1, ref int arg2) 17 | { 18 | string result = (arg1 * arg2).ToString(); 19 | Console.WriteLine("The number is: " + result); 20 | } 21 | static void Main(string[] args) 22 | { 23 | MyDelegate f1 = func1; 24 | MyDelegate f2 = func2; 25 | // Create a composed delegate from f1 and f2 26 | MyDelegate f1f2 = f1 + f2; 27 | 28 | int a=10; 29 | int b=20; 30 | 31 | // call each delegate and then the chain 32 | Console.WriteLine("Calling the first delegate"); 33 | f1(a, ref b); 34 | Console.WriteLine("Calling the second delegate"); 35 | f2(a, ref b); 36 | // Call the composed delegate 37 | Console.WriteLine("\nCalling the chained delegates"); 38 | f1f2(a, ref b); 39 | } 40 | } 41 | } 42 | -------------------------------------------------------------------------------- /Finished/Delegates/DelegatesSolution/DelegatesSolution.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | net5.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /Finished/Delegates/DelegatesSolution/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace DelegatesSolution 4 | { 5 | class Program 6 | { 7 | static void Main(string[] args) 8 | { 9 | ShippingFeesDelegate theDel; 10 | ShippingDestination theDest; 11 | 12 | string theZone; 13 | do 14 | { 15 | // get the destination zone 16 | Console.WriteLine("What is the destination zone?"); 17 | theZone = Console.ReadLine(); 18 | 19 | // if the user wrote "exit" then terminate the program, 20 | // otherwise continue 21 | if (!theZone.Equals("exit")) 22 | { 23 | // given the zone, retrieve the associated shipping info 24 | theDest = ShippingDestination.getDestinationInfo(theZone); 25 | 26 | // if there's no associated info, then the user entered 27 | // an invalid zone, otherwise continue 28 | if (theDest != null) 29 | { 30 | // ask for the price and convert the string to a decimal number 31 | Console.WriteLine("What is the item price?"); 32 | string thePriceStr = Console.ReadLine(); 33 | decimal itemPrice = decimal.Parse(thePriceStr); 34 | 35 | // Each ShippingDestination object has a function called calcFees, 36 | // use that as the delegate for calculating the fee 37 | theDel = theDest.calcFees; 38 | 39 | // For high-risk zones, we tack on the delegate that adds more 40 | if (theDest.m_isHighRisk) 41 | { 42 | theDel += delegate (decimal thePrice, ref decimal itemFee) 43 | { 44 | itemFee += 25.0m; 45 | }; 46 | } 47 | 48 | // now all that is left to do is call the delegate and output 49 | // the shipping fee to the Console 50 | decimal theFee = 0.0m; 51 | theDel(itemPrice, ref theFee); 52 | Console.WriteLine("The shipping fees are: {0}", theFee); 53 | } 54 | else 55 | { 56 | Console.WriteLine("Hmm, you seem to have entered an uknown destination. Try again or 'exit'"); 57 | } 58 | } 59 | } while (theZone != "exit"); 60 | } 61 | } 62 | } 63 | -------------------------------------------------------------------------------- /Finished/Delegates/DelegatesSolution/Shipping.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.Collections.Generic; 3 | using System.Linq; 4 | using System.Text; 5 | using System.Threading.Tasks; 6 | 7 | namespace DelegatesSolution 8 | { 9 | // declare the delegate type used to calculate the fees 10 | public delegate void ShippingFeesDelegate(decimal thePrice, ref decimal fee); 11 | 12 | // This is a base class that is used as a foundation 13 | // for each of the destination zones 14 | abstract class ShippingDestination 15 | { 16 | public bool m_isHighRisk; 17 | public virtual void calcFees(decimal price, ref decimal fee) { } 18 | 19 | // This static method returns an actual ShippingDestination object 20 | // given the name of the destination, or null if none exists 21 | public static ShippingDestination getDestinationInfo(string dest) 22 | { 23 | if (dest.Equals("zone1")) 24 | { 25 | return new Dest_Zone1(); 26 | } 27 | if (dest.Equals("zone2")) 28 | { 29 | return new Dest_Zone2(); 30 | } 31 | if (dest.Equals("zone3")) 32 | { 33 | return new Dest_Zone3(); 34 | } 35 | if (dest.Equals("zone4")) 36 | { 37 | return new Dest_Zone4(); 38 | } 39 | return null; 40 | } 41 | } 42 | 43 | // Now we define implementation classes for each of the real shipping 44 | // destinations. We can add as many as we like as the need arises 45 | 46 | class Dest_Zone1 : ShippingDestination 47 | { 48 | public Dest_Zone1() 49 | { 50 | this.m_isHighRisk = false; 51 | } 52 | public override void calcFees(decimal price, ref decimal fee) 53 | { 54 | fee = price * 0.25m; 55 | } 56 | } 57 | 58 | class Dest_Zone2 : ShippingDestination 59 | { 60 | public Dest_Zone2() 61 | { 62 | this.m_isHighRisk = true; 63 | } 64 | public override void calcFees(decimal price, ref decimal fee) 65 | { 66 | fee = price * 0.12m; 67 | } 68 | } 69 | 70 | class Dest_Zone3 : ShippingDestination 71 | { 72 | public Dest_Zone3() 73 | { 74 | this.m_isHighRisk = false; 75 | } 76 | public override void calcFees(decimal price, ref decimal fee) 77 | { 78 | fee = price * 0.08m; 79 | } 80 | } 81 | 82 | class Dest_Zone4 : ShippingDestination 83 | { 84 | public Dest_Zone4() 85 | { 86 | this.m_isHighRisk = true; 87 | } 88 | public override void calcFees(decimal price, ref decimal fee) 89 | { 90 | fee = price * 0.04m; 91 | } 92 | } 93 | } -------------------------------------------------------------------------------- /Finished/Events/BasicEvents/BasicEvents.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | net5.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /Finished/Events/BasicEvents/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace BasicEvents 4 | { 5 | // define the delegate for the event handler 6 | public delegate void myEventHandler(string value); 7 | 8 | class EventPublisher 9 | { 10 | private string theVal; 11 | 12 | // declare the event 13 | public event myEventHandler valueChanged; 14 | 15 | public string Val 16 | { 17 | set { 18 | this.theVal = value; 19 | // when the value changes, fire the event 20 | this.valueChanged(theVal); 21 | } 22 | } 23 | } 24 | 25 | class Program 26 | { 27 | static void Main(string[] args) 28 | { 29 | // use a named function as an event handler 30 | EventPublisher obj = new EventPublisher(); 31 | obj.valueChanged += new myEventHandler(obj_valueChanged); 32 | 33 | // use an anonymous delegate as an event handler 34 | obj.valueChanged += delegate (string val) { 35 | Console.WriteLine("The value changed to {0}", val); 36 | }; 37 | 38 | string str; 39 | do { 40 | Console.WriteLine("Enter a value: "); 41 | str = Console.ReadLine(); 42 | if (!str.Equals("exit")) { 43 | obj.Val = str; 44 | } 45 | } while (!str.Equals("exit")); 46 | Console.WriteLine("Goodbye!"); 47 | } 48 | 49 | // This function will be called when the value changes in the EventPublisher class 50 | static void obj_valueChanged(string value) 51 | { 52 | Console.WriteLine("The value changed to {0}", value); 53 | } 54 | } 55 | } 56 | -------------------------------------------------------------------------------- /Finished/Events/ChainedEvents/ChainedEvents.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | net5.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /Finished/Events/ChainedEvents/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace ChainedEvents 4 | { 5 | // define the delegate for the event handler 6 | public delegate void myEventHandler(string value); 7 | 8 | class EventPublisher 9 | { 10 | private string theVal; 11 | // declare the event handler 12 | public event myEventHandler valueChanged; 13 | public event EventHandler objChanged; 14 | 15 | public string Val 16 | { 17 | set { 18 | this.theVal = value; 19 | // when the value changes, fire the event 20 | this.valueChanged(theVal); 21 | this.objChanged(this, new ObjChangeEventArgs() { propChanged = "Val" }); 22 | } 23 | } 24 | } 25 | 26 | class ObjChangeEventArgs : EventArgs 27 | { 28 | public string propChanged; 29 | } 30 | 31 | class Program 32 | { 33 | static void Main(string[] args) 34 | { 35 | // create the test class 36 | EventPublisher obj = new EventPublisher(); 37 | // Connect multiple event handlers 38 | obj.valueChanged += new myEventHandler(changeListener1); 39 | obj.valueChanged += new myEventHandler(changeListener2); 40 | 41 | // Use an anonymous delegate as the event handler 42 | obj.valueChanged += delegate (string s) { 43 | Console.WriteLine("This came from the anonymous handler!"); 44 | }; 45 | 46 | obj.objChanged += delegate (object sender, ObjChangeEventArgs e) { 47 | Console.WriteLine("{0} had the '{1}' property changed", sender.GetType(), e.propChanged); 48 | }; 49 | 50 | string str; 51 | do { 52 | Console.WriteLine("Enter a value: "); 53 | str = Console.ReadLine(); 54 | if (!str.Equals("exit")) { 55 | obj.Val = str; 56 | } 57 | } while (!str.Equals("exit")); 58 | Console.WriteLine("Goodbye!"); 59 | } 60 | 61 | static void changeListener1(string value) 62 | { 63 | Console.WriteLine("The value changed to {0}", value); 64 | } 65 | static void changeListener2(string value) 66 | { 67 | Console.WriteLine("I also listen to the event, and got {0}", value); 68 | } 69 | } 70 | } -------------------------------------------------------------------------------- /Finished/Events/EventsSolution/EventsSolution.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | net5.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /Finished/Events/EventsSolution/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace EventsSolution 4 | { 5 | public delegate void BalanceEventHandler(decimal theValue); 6 | 7 | class PiggyBank 8 | { 9 | private decimal m_bankBalance; 10 | public event BalanceEventHandler balanceChanged; 11 | 12 | public decimal theBalance 13 | { 14 | set 15 | { 16 | m_bankBalance = value; 17 | balanceChanged(value); 18 | } 19 | get 20 | { 21 | return m_bankBalance; 22 | } 23 | } 24 | } 25 | 26 | class BalanceLogger 27 | { 28 | public void balanceLog(decimal amount) 29 | { 30 | Console.WriteLine("The balance amount is {0}", amount); 31 | } 32 | } 33 | 34 | class BalanceWatcher 35 | { 36 | public void balanceWatch(decimal amount) 37 | { 38 | if (amount > 500.0m) 39 | Console.WriteLine("You reached your savings goal! You have {0}", amount); 40 | } 41 | } 42 | 43 | class Program 44 | { 45 | static void Main(string[] args) 46 | { 47 | PiggyBank pb = new PiggyBank(); 48 | BalanceLogger bl = new BalanceLogger(); 49 | BalanceWatcher bw = new BalanceWatcher(); 50 | 51 | pb.balanceChanged += bl.balanceLog; 52 | pb.balanceChanged += bw.balanceWatch; 53 | 54 | string theStr; 55 | do 56 | { 57 | Console.WriteLine("How much to deposit?"); 58 | 59 | theStr = Console.ReadLine(); 60 | if (!theStr.Equals("exit")) 61 | { 62 | decimal newVal = decimal.Parse(theStr); 63 | 64 | pb.theBalance += newVal; 65 | } 66 | } while (!theStr.Equals("exit")); 67 | } 68 | } 69 | } 70 | -------------------------------------------------------------------------------- /Finished/Lambdas/BasicLambdas/BasicLambdas.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | net5.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /Finished/Lambdas/BasicLambdas/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace BasicLambdas 4 | { 5 | // define a few delegate types 6 | public delegate int MyDelegate(int x); 7 | public delegate void MyDelegate2(int x, string prefix); 8 | public delegate bool ExprDelegate(int x); 9 | 10 | class Program 11 | { 12 | static void Main(string[] args) 13 | { 14 | // Create a basic delegate that squares a number 15 | MyDelegate d1 = (x) => x * x; 16 | Console.WriteLine("The result of d1 is: {0}", d1(5)); 17 | 18 | // Dynamically change the delegate to something else 19 | d1 = (x) => x * 10; 20 | Console.WriteLine("The result of d1 is: {0}", d1(5)); 21 | 22 | // Create a delegate that takes multiple arguments 23 | MyDelegate2 d2 = (x, y) => 24 | { 25 | Console.WriteLine("The two-arg lambda: {1}, {0}", x * 10, y); 26 | }; 27 | d2(25, "Some string"); 28 | 29 | // Define an expression delegate 30 | ExprDelegate d3 = (x) => x > 10; 31 | Console.WriteLine("Calling d3 with 5: {0}", d3(5)); 32 | Console.WriteLine("Calling d3 with 15: {0}", d3(15)); 33 | } 34 | } 35 | } -------------------------------------------------------------------------------- /Finished/Lambdas/LambdaDelegates/LambdaDelegates.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | net5.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /Finished/Lambdas/LambdaDelegates/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace LambdaDelegates 4 | { 5 | // define a delegate 6 | public delegate void myEventHandler(string value); 7 | 8 | class MyClass 9 | { 10 | private string theVal; 11 | public event myEventHandler valueChanged; 12 | 13 | public string Val 14 | { 15 | set 16 | { 17 | this.theVal = value; 18 | // when the value changes, fire the event 19 | this.valueChanged(theVal); 20 | } 21 | } 22 | } 23 | 24 | class Program 25 | { 26 | static void Main(string[] args) 27 | { 28 | MyClass obj = new MyClass(); 29 | 30 | // Use a Lambda expression to define an event handler 31 | // Note that this is a statement lambda, due to use of { } 32 | obj.valueChanged += (x) => 33 | { 34 | Console.WriteLine("The value changed to {0}", x); 35 | }; 36 | 37 | string str; 38 | do 39 | { 40 | str = Console.ReadLine(); 41 | if (!str.Equals("exit")) 42 | { 43 | obj.Val = str; 44 | } 45 | } while (!str.Equals("exit")); 46 | 47 | Console.WriteLine("Goodbye!"); 48 | } 49 | } 50 | } 51 | -------------------------------------------------------------------------------- /Finished/Lambdas/LambdasSolution/LambdasSolution.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | net5.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /Finished/Lambdas/LambdasSolution/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace LambdasSolution 4 | { 5 | public delegate void BalanceEventHandler(decimal theValue); 6 | 7 | class PiggyBank 8 | { 9 | private decimal m_bankBalance; 10 | public event BalanceEventHandler balanceChanged; 11 | 12 | public decimal theBalance 13 | { 14 | set 15 | { 16 | m_bankBalance = value; 17 | balanceChanged(value); 18 | } 19 | get 20 | { 21 | return m_bankBalance; 22 | } 23 | } 24 | } 25 | 26 | class Program 27 | { 28 | static void Main(string[] args) 29 | { 30 | PiggyBank pb = new PiggyBank(); 31 | 32 | pb.balanceChanged += (amount) => Console.WriteLine("The balance amount is {0}", amount); 33 | pb.balanceChanged += (amount) => { if (amount > 500.0m) Console.WriteLine("You reached your savings goal! You have {0}", amount); }; 34 | 35 | string theStr; 36 | do 37 | { 38 | Console.WriteLine("How much to deposit?"); 39 | 40 | theStr = Console.ReadLine(); 41 | if (!theStr.Equals("exit")) 42 | { 43 | decimal newVal = decimal.Parse(theStr); 44 | 45 | pb.theBalance += newVal; 46 | } 47 | } while (!theStr.Equals("exit")); 48 | } 49 | } 50 | } -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | LinkedIn Learning Exercise Files License Agreement 2 | ================================================== 3 | 4 | This License Agreement (the "Agreement") is a binding legal agreement 5 | between you (as an individual or entity, as applicable) and LinkedIn 6 | Corporation (“LinkedIn”). By downloading or using the LinkedIn Learning 7 | exercise files in this repository (“Licensed Materials”), you agree to 8 | be bound by the terms of this Agreement. 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Please review the applicable licenses of the 12 | additional dependencies. 13 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # C#: Delegates, Events, and Lambdas 2 | This is the repository for the LinkedIn Learning course C#: Delegates, Events, and Lambdas. The full course is available from [LinkedIn Learning][lil-course-url]. 3 | 4 | ![C#: Delegates, Events, and Lambdas][lil-thumbnail-url] 5 | 6 | C# provides different function types to fit a variety of real-world development scenarios. In this course, Joe Marini explores three important features of C#: Delegates, events, and lambdas. First, Joe shows how delegates are used to provide interchangeable functions during the lifetime of a program, which makes it easy to modify the functionality of an app on the fly. He then covers events, which are used to handle messages from both within and outside the program and can be turned on and off dynamically. Finally, he shows how lambdas provide a concise, efficient way of writing simple expressions without having all the associated syntax of a full function. These features help keep C# code readable, efficient, and maintainable, so join Joe to learn how to adapt this flexible set of programming tools to your own C# programming needs. 7 | 8 | ## Instructions 9 | This repository has the starting and finished example code for the C# Delegates, Events, and Lambdas course. Use the starting point code to follow along with the course and build towards the finished examples. Use the finished examples to learn more about how each of the various features of C# work. 10 | 11 | ## Installing 12 | 1. To use these exercise files, you must have the following installed: 13 | - A text editor or IDE, such as Visual Studio, Visual Studio Code, Atom, etc 14 | - The .NET SDK, version 5 15 | 2. Clone this repository into your local machine using the terminal (Mac), CMD (Windows), or a GUI tool like SourceTree. 16 | 17 | 18 | ### Instructor 19 | 20 | Joe Marini 21 | 22 | Senior Director of Product and Engineering 23 | 24 | 25 | 26 | Check out my other courses on [LinkedIn Learning](https://www.linkedin.com/learning/instructors/joe-marini). 27 | 28 | [lil-course-url]: https://www.linkedin.com/learning/c-sharp-delegates-events-and-lambdas-14503458 29 | [lil-thumbnail-url]: https://cdn.lynda.com/course/3006906/3006906-1642535780479-16x9.jpg 30 | 31 | 32 | 33 | 34 | 35 | 36 | [0]: # (Replace these placeholder URLs with actual course URLs) 37 | 38 | [lil-course-url]: https://www.linkedin.com/learning/ 39 | [lil-thumbnail-url]: http:// 40 | 41 | -------------------------------------------------------------------------------- /Start/Delegates/AnonymousDelegates/AnonymousDelegates.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | net5.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /Start/Delegates/AnonymousDelegates/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace AnonymousDelegates 4 | { 5 | public delegate string MyDelegate(int arg1, int arg2); 6 | 7 | class Program 8 | { 9 | static void Main(string[] args) 10 | { 11 | // TODO: Implement an anonymous delegate 12 | 13 | } 14 | } 15 | } 16 | -------------------------------------------------------------------------------- /Start/Delegates/BasicDelegates/BasicDelegates.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | net5.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /Start/Delegates/BasicDelegates/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace BasicDelegates 4 | { 5 | // TODO: declare the delegate type 6 | 7 | 8 | class MyClass 9 | { 10 | // Delegates can be bound to instance members as well as 11 | // static class functions 12 | public string instanceMethod1(int arg1, int arg2) 13 | { 14 | return ((arg1 + arg2) * arg1).ToString(); 15 | } 16 | } 17 | 18 | class Program 19 | { 20 | // TODO: Create functions to serve as delegate implementations 21 | 22 | 23 | static void Main(string[] args) 24 | { 25 | // TODO: exercise each delegate function 26 | 27 | 28 | // TODO: Use an instance function of a class as a delegate 29 | 30 | 31 | } 32 | } 33 | } 34 | -------------------------------------------------------------------------------- /Start/Delegates/Composable/Composable.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | net5.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /Start/Delegates/Composable/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace Composable 4 | { 5 | // declare the delegate type 6 | public delegate void MyDelegate(int arg1, int arg2); 7 | 8 | class Program 9 | { 10 | static void func1(int arg1, int arg2) 11 | { 12 | string result = (arg1 + arg2).ToString(); 13 | Console.WriteLine("The number from func1 is: " + result); 14 | } 15 | static void func2(int arg1, int arg2) 16 | { 17 | string result = (arg1 * arg2).ToString(); 18 | Console.WriteLine("The number from func2 is: " + result); 19 | } 20 | static void Main(string[] args) 21 | { 22 | MyDelegate f1 = func1; 23 | MyDelegate f2 = func2; 24 | // Create a composed delegate from f1 and f2 25 | 26 | int a=10; 27 | int b=20; 28 | 29 | // call each delegate and then the chain 30 | Console.WriteLine("Calling the first delegate"); 31 | f1(a, b); 32 | Console.WriteLine("Calling the second delegate"); 33 | f2(a, b); 34 | // TODO: Call the composed delegate 35 | Console.WriteLine("\nCalling the chained delegates"); 36 | 37 | 38 | // TODO: subtract off one of the delegates 39 | Console.WriteLine("\nCalling the unchained delegates"); 40 | 41 | } 42 | } 43 | } 44 | -------------------------------------------------------------------------------- /Start/Delegates/Composable2/Composable2.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | net5.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /Start/Delegates/Composable2/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace Composable2 4 | { 5 | // declare the delegate type 6 | public delegate void MyDelegate(int arg1, int arg2); 7 | 8 | class Program 9 | { 10 | static void func1(int arg1, int arg2) 11 | { 12 | string result = (arg1 + arg2).ToString(); 13 | Console.WriteLine("The number is: " + result); 14 | } 15 | static void func2(int arg1, int arg2) 16 | { 17 | string result = (arg1 * arg2).ToString(); 18 | Console.WriteLine("The number is: " + result); 19 | } 20 | static void Main(string[] args) 21 | { 22 | MyDelegate f1 = func1; 23 | MyDelegate f2 = func2; 24 | // Create a composed delegate from f1 and f2 25 | MyDelegate f1f2 = f1 + f2; 26 | 27 | int a=10; 28 | int b=20; 29 | 30 | // call each delegate and then the chain 31 | Console.WriteLine("Calling the first delegate"); 32 | f1(a, b); 33 | Console.WriteLine("Calling the second delegate"); 34 | f2(a, b); 35 | // Call the composed delegate 36 | Console.WriteLine("\nCalling the chained delegates"); 37 | f1f2(a, b); 38 | 39 | } 40 | } 41 | } 42 | -------------------------------------------------------------------------------- /Start/Delegates/DelegatesSolution/DelegatesSolution.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | net5.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /Start/Delegates/DelegatesSolution/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace DelegatesSolution 4 | { 5 | class Program 6 | { 7 | static void Main(string[] args) 8 | { 9 | } 10 | } 11 | } 12 | -------------------------------------------------------------------------------- /Start/Events/BasicEvents/BasicEvents.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | net5.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /Start/Events/BasicEvents/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace BasicEvents 4 | { 5 | // define the delegate for the event handler 6 | public delegate void myEventHandler(string value); 7 | 8 | class EventPublisher 9 | { 10 | private string theVal; 11 | 12 | // TODO: declare the event 13 | 14 | public string Val 15 | { 16 | set { 17 | this.theVal = value; 18 | // TODO: when the value changes, fire the event 19 | 20 | } 21 | } 22 | } 23 | 24 | class Program 25 | { 26 | static void Main(string[] args) 27 | { 28 | // TODO: use a named function as an event handler 29 | EventPublisher obj = new EventPublisher(); 30 | 31 | // TODO: use an anonymous delegate as an event handler 32 | 33 | 34 | string str; 35 | do { 36 | Console.WriteLine("Enter a value: "); 37 | str = Console.ReadLine(); 38 | if (!str.Equals("exit")) { 39 | obj.Val = str; 40 | } 41 | } while (!str.Equals("exit")); 42 | Console.WriteLine("Goodbye!"); 43 | } 44 | 45 | // This function will be called when the value changes in the EventPublisher class 46 | static void obj_valueChanged(string value) 47 | { 48 | Console.WriteLine("The value changed to {0}", value); 49 | } 50 | } 51 | } 52 | -------------------------------------------------------------------------------- /Start/Events/ChainedEvents/ChainedEvents.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | net5.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /Start/Events/ChainedEvents/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace ChainedEvents 4 | { 5 | // define the delegate for the event handler 6 | public delegate void myEventHandler(string value); 7 | 8 | class EventPublisher 9 | { 10 | private string theVal; 11 | // declare the event handler 12 | public event myEventHandler valueChanged; 13 | // TODO4: Use the EventArgs class 14 | 15 | 16 | public string Val 17 | { 18 | set { 19 | this.theVal = value; 20 | // when the value changes, fire the event 21 | this.valueChanged(theVal); 22 | // TODO5: Use the custom event handler 23 | 24 | } 25 | } 26 | } 27 | 28 | // TODO3: Create a subclass of EventArgs for our use 29 | 30 | class Program 31 | { 32 | static void Main(string[] args) 33 | { 34 | // create the test class 35 | EventPublisher obj = new EventPublisher(); 36 | // TODO1: Connect multiple event handlers 37 | 38 | 39 | // TODO2: Use an anonymous delegate as the event handler 40 | 41 | 42 | // TODO6: Listen for the custom event we defined with EventArgs 43 | 44 | 45 | string str; 46 | do { 47 | Console.WriteLine("Enter a value: "); 48 | str = Console.ReadLine(); 49 | if (!str.Equals("exit")) { 50 | obj.Val = str; 51 | } 52 | } while (!str.Equals("exit")); 53 | Console.WriteLine("Goodbye!"); 54 | } 55 | 56 | static void changeListener1(string value) 57 | { 58 | Console.WriteLine("The value changed to {0}", value); 59 | } 60 | static void changeListener2(string value) 61 | { 62 | Console.WriteLine("I also listen to the event, and got {0}", value); 63 | } 64 | } 65 | } -------------------------------------------------------------------------------- /Start/Events/EventsSolution/EventsSolution.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | net5.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /Start/Events/EventsSolution/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace EventsSolution 4 | { 5 | class Program 6 | { 7 | static void Main(string[] args) 8 | { 9 | } 10 | } 11 | } 12 | -------------------------------------------------------------------------------- /Start/Lambdas/BasicLambdas/BasicLambdas.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | net5.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /Start/Lambdas/BasicLambdas/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace BasicLambdas 4 | { 5 | // define a few delegate types 6 | public delegate int MyDelegate(int x); 7 | public delegate void MyDelegate2(int x, string prefix); 8 | public delegate bool ExprDelegate(int x); 9 | 10 | class Program 11 | { 12 | static void Main(string[] args) 13 | { 14 | // TODO: Create a basic delegate that squares a number 15 | 16 | // TODO: Dynamically change the delegate to something else 17 | 18 | // TODO: Create a delegate that takes multiple arguments 19 | 20 | // TODO: Define an expression delegate 21 | 22 | } 23 | } 24 | } -------------------------------------------------------------------------------- /Start/Lambdas/LambdaDelegates/LambdaDelegates.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | net5.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /Start/Lambdas/LambdaDelegates/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace LambdaDelegates 4 | { 5 | // define a delegate 6 | public delegate void myEventHandler(string value); 7 | 8 | class MyClass 9 | { 10 | private string theVal; 11 | public event myEventHandler valueChanged; 12 | 13 | public string Val 14 | { 15 | set 16 | { 17 | this.theVal = value; 18 | // when the value changes, fire the event 19 | this.valueChanged(theVal); 20 | } 21 | } 22 | } 23 | 24 | class Program 25 | { 26 | static void Main(string[] args) 27 | { 28 | MyClass obj = new MyClass(); 29 | 30 | // TODO: Use a Lambda expression to define an event handler 31 | // Note that this is a statement lambda, due to use of { } 32 | 33 | 34 | string str; 35 | do { 36 | str = Console.ReadLine(); 37 | if (!str.Equals("exit")) 38 | { 39 | obj.Val = str; 40 | } 41 | } while (!str.Equals("exit")); 42 | 43 | Console.WriteLine("Goodbye!"); 44 | } 45 | } 46 | } 47 | -------------------------------------------------------------------------------- /Start/Lambdas/LambdasSolution/LambdasSolution.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | net5.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /Start/Lambdas/LambdasSolution/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | // Use this file to create your solution to the Lambdas challenge 4 | 5 | namespace LambdasSolution 6 | { 7 | public delegate void BalanceEventHandler(decimal theValue); 8 | 9 | class Program 10 | { 11 | static void Main(string[] args) 12 | { 13 | } 14 | } 15 | } --------------------------------------------------------------------------------