├── .gitattributes
├── .gitignore
├── ByteArrayToInt32Converter
├── ByteArrayToInt32Converter.sln
└── ConvertToInt32FromByteArray
│ ├── App.config
│ ├── ConvertToInt32FromByteArray.csproj
│ ├── Program.cs
│ └── Properties
│ └── AssemblyInfo.cs
└── README.md
/.gitattributes:
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/.gitignore:
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195 |
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252 | *.sln.iml
253 |
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/ByteArrayToInt32Converter/ByteArrayToInt32Converter.sln:
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1 |
2 | Microsoft Visual Studio Solution File, Format Version 12.00
3 | # Visual Studio 14
4 | VisualStudioVersion = 14.0.25420.1
5 | MinimumVisualStudioVersion = 10.0.40219.1
6 | Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ConvertToInt32FromByteArray", "ConvertToInt32FromByteArray\ConvertToInt32FromByteArray.csproj", "{A219C995-64D3-4DFD-892C-C7D3185FE4B9}"
7 | EndProject
8 | Global
9 | GlobalSection(SolutionConfigurationPlatforms) = preSolution
10 | Debug|Any CPU = Debug|Any CPU
11 | Release|Any CPU = Release|Any CPU
12 | EndGlobalSection
13 | GlobalSection(ProjectConfigurationPlatforms) = postSolution
14 | {A219C995-64D3-4DFD-892C-C7D3185FE4B9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
15 | {A219C995-64D3-4DFD-892C-C7D3185FE4B9}.Debug|Any CPU.Build.0 = Debug|Any CPU
16 | {A219C995-64D3-4DFD-892C-C7D3185FE4B9}.Release|Any CPU.ActiveCfg = Release|Any CPU
17 | {A219C995-64D3-4DFD-892C-C7D3185FE4B9}.Release|Any CPU.Build.0 = Release|Any CPU
18 | EndGlobalSection
19 | GlobalSection(SolutionProperties) = preSolution
20 | HideSolutionNode = FALSE
21 | EndGlobalSection
22 | EndGlobal
23 |
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/ByteArrayToInt32Converter/ConvertToInt32FromByteArray/App.config:
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2 |
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5 |
6 |
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/ByteArrayToInt32Converter/ConvertToInt32FromByteArray/ConvertToInt32FromByteArray.csproj:
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1 |
2 |
3 |
4 |
5 | Debug
6 | AnyCPU
7 | {A219C995-64D3-4DFD-892C-C7D3185FE4B9}
8 | Exe
9 | Properties
10 | ConvertToInt32FromByteArray
11 | ConvertToInt32FromByteArray
12 | v4.6.1
13 | 512
14 | true
15 |
16 |
17 | AnyCPU
18 | true
19 | full
20 | false
21 | bin\Debug\
22 | DEBUG;TRACE
23 | prompt
24 | 4
25 |
26 |
27 | AnyCPU
28 | pdbonly
29 | true
30 | bin\Release\
31 | TRACE
32 | prompt
33 | 4
34 |
35 |
36 |
37 |
38 |
39 |
40 |
41 |
42 |
43 |
44 |
45 |
46 |
47 |
48 |
49 |
50 |
51 |
52 |
53 |
60 |
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/ByteArrayToInt32Converter/ConvertToInt32FromByteArray/Program.cs:
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1 | using System;
2 | using System.Diagnostics;
3 | using System.Linq;
4 |
5 | namespace ConvertToInt32FromByteArray
6 | {
7 | class Program
8 | {
9 | static void Main(string[] args)
10 | {
11 | var bytes = new byte[] { 24, 12, 255, 1 };
12 |
13 | var a1 = 0;
14 | var a2 = 0;
15 | var a3 = 0;
16 | var n = 1000000;
17 | var sw1 = Stopwatch.StartNew();
18 | for (int i = 0; i < n; i++)
19 | {
20 | a1 = BitConverter.ToInt32(bytes, 0);
21 | }
22 | Console.WriteLine($"BitConverter from System.Diagnostics used {sw1.ElapsedMilliseconds} msc for {n} iterations\n");
23 |
24 | var sw2 = Stopwatch.StartNew();
25 | for (int i = 0; i < n; i++)
26 | {
27 | a2 = ConvertByteArrayToInt32(bytes);
28 | }
29 | Console.WriteLine($"My ConvertByteArrayToInt32 converter used {sw1.ElapsedMilliseconds} msc for {n} iterations\n");
30 |
31 | var sw3 = Stopwatch.StartNew();
32 | for (int i = 0; i < n; i++)
33 | {
34 | a3 = FromByteToInt1(24, 12, 255, 1);
35 | }
36 | Console.WriteLine($"Tigran's FromByteToInt1 converter used {sw1.ElapsedMilliseconds} msc for {n} iterations\n");
37 |
38 |
39 | Console.ReadKey();
40 | }
41 |
42 | public static int ConvertByteArrayToInt32(byte[] bytes)
43 | {
44 | var binary = bytes.Reverse().Select(x => Convert.ToString(x, 2).PadLeft(8, '0')).SelectMany(x => x).ToArray();
45 |
46 | var result = 0;
47 | for (int i = 0; i < binary.Length; i++)
48 | if (binary[binary.Length - i - 1] == '1') result += (int)Math.Pow(2, i);
49 |
50 | return result;
51 | }
52 | public static int FromByteToInt1(byte a, byte b, byte c, byte d)
53 | {
54 | string s = Convert.ToString(d, 2).PadLeft(8, '0') + Convert.ToString(c, 2).PadLeft(8, '0') + Convert.ToString(b, 2).PadLeft(8, '0') + Convert.ToString(a, 2).PadLeft(8, '0');
55 | var decim = 0;
56 | for (int i = 0; i < s.Length; i++)
57 | {
58 | if (s[s.Length - i - 1] == '0') continue;
59 | decim += (int)Math.Pow(2, i);
60 | }
61 | return decim;
62 | }
63 | }
64 | }
65 |
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/ByteArrayToInt32Converter/ConvertToInt32FromByteArray/Properties/AssemblyInfo.cs:
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1 | using System.Reflection;
2 | using System.Runtime.CompilerServices;
3 | using System.Runtime.InteropServices;
4 |
5 | // General Information about an assembly is controlled through the following
6 | // set of attributes. Change these attribute values to modify the information
7 | // associated with an assembly.
8 | [assembly: AssemblyTitle("ConvertToInt32FromByteArray")]
9 | [assembly: AssemblyDescription("")]
10 | [assembly: AssemblyConfiguration("")]
11 | [assembly: AssemblyCompany("")]
12 | [assembly: AssemblyProduct("ConvertToInt32FromByteArray")]
13 | [assembly: AssemblyCopyright("Copyright © 2017")]
14 | [assembly: AssemblyTrademark("")]
15 | [assembly: AssemblyCulture("")]
16 |
17 | // Setting ComVisible to false makes the types in this assembly not visible
18 | // to COM components. If you need to access a type in this assembly from
19 | // COM, set the ComVisible attribute to true on that type.
20 | [assembly: ComVisible(false)]
21 |
22 | // The following GUID is for the ID of the typelib if this project is exposed to COM
23 | [assembly: Guid("a219c995-64d3-4dfd-892c-c7d3185fe4b9")]
24 |
25 | // Version information for an assembly consists of the following four values:
26 | //
27 | // Major Version
28 | // Minor Version
29 | // Build Number
30 | // Revision
31 | //
32 | // You can specify all the values or you can default the Build and Revision Numbers
33 | // by using the '*' as shown below:
34 | // [assembly: AssemblyVersion("1.0.*")]
35 | [assembly: AssemblyVersion("1.0.0.0")]
36 | [assembly: AssemblyFileVersion("1.0.0.0")]
37 |
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/README.md:
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1 | # Byte-array-to-Int32-converter
2 | Convert byte array to Int32 on C# 6.0
3 |
4 | This method takes a byte array and converts it to an Int32.
5 | Here is the body of the method:
6 |
7 | ```javascript
8 | public static int ConvertByteArrayToInt32(byte[] bytes)
9 | {
10 | var binary = bytes.Reverse().Select(x => Convert.ToString(x, 2).PadLeft(8, '0')).SelectMany(x => x).ToArray();
11 |
12 | var result = 0;
13 | for (int i = 0; i < binary.Length; i++)
14 | if (binary[binary.Length - i - 1] == '1') result += (int)Math.Pow(2, i);
15 |
16 | return result;
17 | }
18 | ```
19 |
20 | After measuring the performances of `BitConverter` from `System.Diagnostics`, my custom converter and @tigranv 's `FromByteToInt1`, the outcome reveals that you **don't need to reinvent the wheel**. Everything you need exists already in the language, you just need to find its place. :+1:
21 |
22 |
23 |
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