├── CSharp_8_Async_Streams_Demo
├── AsyncStreams
│ ├── App.config
│ ├── Definitions.cs
│ ├── Program.cs
│ ├── Properties
│ │ └── AssemblyInfo.cs
│ ├── Streams.cs
│ └── AsyncStreams.csproj
└── AsyncStreamsDemo.sln
├── README.md
└── .gitignore
/CSharp_8_Async_Streams_Demo/AsyncStreams/App.config:
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1 |
2 |
3 |
4 |
5 |
6 |
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/CSharp_8_Async_Streams_Demo/AsyncStreams/Definitions.cs:
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1 | using System.Threading.Tasks;
2 |
3 | namespace AsyncStreams
4 | {
5 | public interface IAsyncDisposable
6 | {
7 | Task DiskposeAsync();
8 | }
9 |
10 | public interface IAsyncEnumerable
11 | {
12 | IAsyncEnumerator GetAsyncEnumerator();
13 | }
14 |
15 | public interface IAsyncEnumerator
16 | {
17 | Task WaitForNextAsync();
18 | T TryGetNext(out bool success);
19 | }
20 | }
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/README.md:
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1 | # CSharp_8_Async_Streams_Demo
2 | C# 8 Demo for the new proposed feature Async Streams
3 |
4 |
5 | Article: https://www.infoq.com/articles/cs8-async-streams
6 |
7 | To be able to test this feature, then you you have to build the roslyn branch: https://github.com/dotnet/roslyn/tree/features/async-streams
8 |
9 | Build the Async Streams Branch
10 | Start the VNext VS
11 | Open and run the project in the VNext VS
12 | Alternatively, you can use sharplab.io
13 |
14 | more info:
15 | https://github.com/dotnet/csharplang/blob/master/proposals/async-streams.md
16 |
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/CSharp_8_Async_Streams_Demo/AsyncStreams/Program.cs:
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1 | using System;
2 | using System.IO;
3 | using System.Threading.Tasks;
4 |
5 | namespace AsyncStreams
6 | {
7 | public class Program
8 | {
9 | private static (Stream stream, long checkSum) CreateStream()
10 | {
11 | long checksum = 0L;
12 |
13 | byte[] bytes = new byte[20000];
14 |
15 | for (int i = 0; i < bytes.Length; i++)
16 | {
17 | byte value = (byte)(i % byte.MaxValue);
18 | bytes[i] = value;
19 |
20 | unchecked { checksum += value; }
21 | }
22 |
23 | MemoryStream stream = new MemoryStream(bytes);
24 | return (stream, checksum);
25 | }
26 |
27 | private static async Task Main(string[] args)
28 | {
29 | (Stream stream, long checksum) = CreateStream();
30 |
31 | long c = 0L;
32 |
33 | foreach await (byte b in stream.AsEnumerable())
34 | {
35 | unchecked { c += b; }
36 | }
37 |
38 | if (c == checksum)
39 | {
40 | Console.WriteLine("Checksums match!");
41 | }
42 | }
43 | }
44 | }
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/CSharp_8_Async_Streams_Demo/AsyncStreamsDemo.sln:
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1 |
2 | Microsoft Visual Studio Solution File, Format Version 12.00
3 | # Visual Studio 15
4 | VisualStudioVersion = 15.0.27703.1
5 | MinimumVisualStudioVersion = 10.0.40219.1
6 | Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AsyncStreams", "AsyncStreams\AsyncStreams.csproj", "{073CAEFD-1E71-4638-A5AF-27E8CF80B1FD}"
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 | {073CAEFD-1E71-4638-A5AF-27E8CF80B1FD}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
15 | {073CAEFD-1E71-4638-A5AF-27E8CF80B1FD}.Debug|Any CPU.Build.0 = Debug|Any CPU
16 | {073CAEFD-1E71-4638-A5AF-27E8CF80B1FD}.Release|Any CPU.ActiveCfg = Release|Any CPU
17 | {073CAEFD-1E71-4638-A5AF-27E8CF80B1FD}.Release|Any CPU.Build.0 = Release|Any CPU
18 | EndGlobalSection
19 | GlobalSection(SolutionProperties) = preSolution
20 | HideSolutionNode = FALSE
21 | EndGlobalSection
22 | GlobalSection(ExtensibilityGlobals) = postSolution
23 | SolutionGuid = {DF312D44-F3D1-4407-A4C7-050DFA52AE1B}
24 | EndGlobalSection
25 | EndGlobal
26 |
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/CSharp_8_Async_Streams_Demo/AsyncStreams/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("AsyncStreams")]
9 | [assembly: AssemblyDescription("")]
10 | [assembly: AssemblyConfiguration("")]
11 | [assembly: AssemblyCompany("")]
12 | [assembly: AssemblyProduct("AsyncStreams")]
13 | [assembly: AssemblyCopyright("Copyright © 2018")]
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("073caefd-1e71-4638-a5af-27e8cf80b1fd")]
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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/CSharp_8_Async_Streams_Demo/AsyncStreams/Streams.cs:
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1 | using System;
2 | using System.IO;
3 | using System.Threading.Tasks;
4 |
5 | namespace AsyncStreams
6 | {
7 | public class StreamEnumerator : IAsyncEnumerator
8 | {
9 | private readonly Stream _stream;
10 | private readonly byte[] _buffer;
11 | private int _bytesRead;
12 | private int _bufferIndex;
13 | private const int BufferSize = 8000;
14 |
15 | public StreamEnumerator(Stream stream)
16 | {
17 | _stream = stream ?? throw new ArgumentNullException(nameof(stream));
18 | _buffer = new byte[BufferSize];
19 | _bytesRead = -1;
20 | }
21 |
22 | public async Task WaitForNextAsync()
23 | {
24 | await Task.Delay(1000);
25 |
26 | _bytesRead = await _stream.ReadAsync(_buffer, 0, BufferSize);
27 | _bufferIndex = 0;
28 |
29 | if (_bytesRead == 0)
30 | {
31 | Console.WriteLine();
32 | Console.WriteLine("Enumeration complete!");
33 | return false;
34 | }
35 |
36 | Console.WriteLine($"Read {_bytesRead: 0,0} bytes");
37 |
38 | return true;
39 | }
40 |
41 | public byte TryGetNext(out bool success)
42 | {
43 | if (_bufferIndex == _bytesRead)
44 | {
45 | success = false;
46 | return 0;
47 | }
48 |
49 | byte result = _buffer[_bufferIndex];
50 | _bufferIndex++;
51 |
52 | success = true;
53 | return result;
54 | }
55 |
56 | public Task DisposeAsync()
57 | {
58 | _stream.Dispose();
59 | Console.WriteLine("Stream disposed!");
60 | return Task.CompletedTask;
61 | }
62 | }
63 |
64 | public class EnumerableStream : IAsyncEnumerable
65 | {
66 | private readonly Stream _stream;
67 |
68 | public EnumerableStream(Stream stream) => _stream = stream ?? throw new ArgumentNullException(nameof(stream));
69 |
70 | public IAsyncEnumerator GetAsyncEnumerator() => new StreamEnumerator(_stream);
71 | }
72 |
73 | public static class StreamExtensions
74 | {
75 | public static IAsyncEnumerable AsEnumerable(this Stream stream) => new EnumerableStream(stream);
76 | }
77 | }
78 |
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/CSharp_8_Async_Streams_Demo/AsyncStreams/AsyncStreams.csproj:
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1 |
2 |
3 |
4 |
5 | Debug
6 | AnyCPU
7 | {073CAEFD-1E71-4638-A5AF-27E8CF80B1FD}
8 | Exe
9 | AsyncStreams
10 | AsyncStreams
11 | v4.7.2
12 | 512
13 | true
14 | true
15 | publish\
16 | true
17 | Disk
18 | false
19 | Foreground
20 | 7
21 | Days
22 | false
23 | false
24 | true
25 | 0
26 | 1.0.0.%2a
27 | false
28 | false
29 | true
30 |
31 |
32 | AnyCPU
33 | false
34 | none
35 | false
36 | bin\Debug\
37 | DEBUG;TRACE
38 | none
39 | 4
40 | Off
41 | false
42 | 7.3
43 |
44 |
45 | AnyCPU
46 | pdbonly
47 | true
48 | bin\Release\
49 | TRACE
50 | prompt
51 | 4
52 |
53 |
54 |
55 |
56 |
57 |
58 |
59 |
60 |
61 |
62 |
63 |
64 | False
65 | Microsoft .NET Framework 4.7.2 %28x86 and x64%29
66 | true
67 |
68 |
69 | False
70 | .NET Framework 3.5 SP1
71 | false
72 |
73 |
74 |
75 |
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/.gitignore:
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