twMVC#46 一探 C# 11 與 .NET 7 的神奇
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The document announces a weekly gathering focusing on C# 11 and .NET 7 hosted by Bill Chung. It outlines topics such as new features in .NET 7, .NET MAUI enhancements, ASP.NET Core migrations, and performance improvements, along with example usage for the new features. The document promotes skill learning through practical application rather than theoretical history, emphasizing real-world insights from industry practitioners.
![https://mvc.tw
WebSockets over HTTP/2
class ClientWebSocket : WebSocket
{ // EXISTING
public Task ConnectAsync(Uri uri, CancellationToken cancellationToken);
// NEW
public Task ConnectAsync(Uri uri, HttpMessageInvoker invoker, CancellationToken cancellationToken);
}
class ClientWebSocketOptions
{
// NEW
public System.Version HttpVersion
{
get { throw null; }
[System.Runtime.Versioning.UnsupportedOSPlatformAttribute("browser")]
set { }
};
public System.Net.Http.HttpVersionPolicy HttpVersionPolicy
{
get { throw null; }
[System.Runtime.Versioning.UnsupportedOSPlatformAttribute("browser")]
set { }
};
}](https://image.slidesharecdn.com/twmvc46csharper11dotnet7-221119150549-28b66d92/85/twMVC-46-C-11-NET-7-19-320.jpg)
![https://mvc.tw
List Patterns
▪ 清單比對模式，可以比較集合或陣列內容
int[] array = { 1,9,8,7,6,5,3};
var result = array switch
{
[1, .. var s, 3] => string.Join("-", s),
[1, 2] => "A",
[2, 5] => "B",
[1, _] => "C",
[..] => "D"
};](https://image.slidesharecdn.com/twmvc46csharper11dotnet7-221119150549-28b66d92/85/twMVC-46-C-11-NET-7-29-320.jpg)
![https://mvc.tw
[ServiceFilter(typeof(ResponseLoggerFilter))]
[ServiceFilter<ResponseLoggerFilter>]
Possible future](https://image.slidesharecdn.com/twmvc46csharper11dotnet7-221119150549-28b66d92/85/twMVC-46-C-11-NET-7-31-320.jpg)
![https://mvc.tw
Extended nameof scope
▪ nameof 敘述可用於 method 與其 parameters 的 attribute 上
[Description(nameof(Main))]
static void Main([Description(nameof(args))]string[] args)](https://image.slidesharecdn.com/twmvc46csharper11dotnet7-221119150549-28b66d92/85/twMVC-46-C-11-NET-7-36-320.jpg)
![https://mvc.tw
Required members
▪ 強迫在建立執行體時，成員必須初始化
public class Person
{
[SetsRequiredMembers]
public Person(string firstName, string lastName) =>
(FirstName, LastName) = (firstName, lastName);
public required string FirstName { get; init; }
public required string LastName { get; init; }
}](https://image.slidesharecdn.com/twmvc46csharper11dotnet7-221119150549-28b66d92/85/twMVC-46-C-11-NET-7-38-320.jpg)
twMVC#46 一探 C# 11 與 .NET 7 的神奇
- 1. https://mvc.tw 歡迎參加我們的每週四固定聚會 1 全村的希望 一探 C# 11 與 .NET 7 的神奇 講者：Bill Chung
- 2. https://mvc.tw about me ▪ Bill Chung ▪ 專長是說故事 ▪ 海角點部落 https://dotblogs.com.tw/billchung ▪ github https://github.com/billchungiii
- 4. https://mvc.tw Agenda 4 ▪ .NET MAUI ▪ ASP.NET Core Migrations ▪ Cloud Native ▪ Performance ▪ WebSockets over HTTP/2 ▪ New APIs # .NET 7
- 5. https://mvc.tw .NET 7 Agenda 5 ▪ String ▪ List patterns ▪ Generic attribute ▪ Generic math support ▪ Auto-default struct ▪ Extended nameof scope ▪ File-Scoped types ▪ Required members #
- 7. https://mvc.tw .NET MAUI ▪ 新增支援 Tizen ▪ 更多的控制項 ▪ 更好的效能
- 9. https://mvc.tw ASP.NET Core Migrations 9 Migrate ASP.NET to ASP.NET Core 瀏覽 https://aka.ms/AspNetCoreMigration 安裝 Microsoft Project Migrations (Experimental)
- 10. Migration steps
- 11. https://mvc.tw External traffic ASP.NET Business logic External traffic ASP.NET Core ASP.NET Business logic YARP proxy
- 13. https://mvc.tw External traffic ASP.NET Core Business logic Adapters External traffic ASP.NET Core Business logic
- 15. https://mvc.tw Cloud Native ▪ gRPC JSON transcoding for .NET ▪ Built-in container support for the .NET SDK ▪ Azure v4 support .NET 7
- 16. https://mvc.tw gRPC JSON transcoding for .NET ▪ Microsoft.AspNetCore.Grpc.JsonTranscoding syntax = "proto3"; import "google/api/annotations.proto"; package greet; service Greeter { rpc SayHello (HelloRequest) returns (HelloReply) { option (google.api.http) = { get: "/v1/greeter/{name}" }; } }
- 17. https://mvc.tw built-in container support for the .NET SDK ▪ support Linux container ▪ just dotnet publish
- 18. https://mvc.tw Performance ▪ JIT ▪ GC ▪ Native AOT ▪ Mono ▪ Reflection ▪ Interop ▪ Threading ▪ Primitive Types and Numerics ▪ Arrays, Strings, and Spans ▪ Regex ▪ Collections ▪ Regex ▪ LINQ ▪ File I/O ▪ Compression ▪ Networking ▪ JSON ▪ XML ▪ Cryptography ▪ Diagnostics ▪ Exceptions ▪ Registry ▪ Analyzers
- 19. https://mvc.tw WebSockets over HTTP/2 class ClientWebSocket : WebSocket { // EXISTING public Task ConnectAsync(Uri uri, CancellationToken cancellationToken); // NEW public Task ConnectAsync(Uri uri, HttpMessageInvoker invoker, CancellationToken cancellationToken); } class ClientWebSocketOptions { // NEW public System.Version HttpVersion { get { throw null; } [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("browser")] set { } }; public System.Net.Http.HttpVersionPolicy HttpVersionPolicy { get { throw null; } [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("browser")] set { } }; }
- 20. https://mvc.tw class HttpMethod : IEquatable<HttpMethod> { // EXISTING // internal static HttpMethod Connect { get { throw null; } } // NEW public static HttpMethod Connect { get { throw null; } } } class HttpRequestHeaders : HttpHeaders { public string? Protocol { get { } set { } }; }
- 21. https://mvc.tw Usage ClientWebSocket ws = new(); ws.Options.HttpVersionPolicy = HttpVersionPolicy.RequestVersionOrHigher; ws.Options.HttpVersion = HttpVersion.Version20; ws.ConnectAsync(uri, new HttpMessageInvoker(handler), cancellationToken); HttpRequestMessage request = new(HttpMethod.Connect, server.Address); request.Headers.Protocol = "websocket";
- 22. https://mvc.tw APIs ▪ INumberBase<T> … ▪ Added new Tar APIs ▪ Adding Microseconds and Nanoseconds to TimeStamp, DateTime, DateTimeOffset, and TimeOnly
- 23. https://mvc.tw INumberBase<T> public interface INumberBase<TSelf> : IAdditionOperators<TSelf, TSelf, TSelf>, IAdditiveIdentity<TSelf, TSelf>, IDecrementOperators<TSelf>, IDivisionOperators<TSelf, TSelf, TSelf>, IEquatable<TSelf>, IEqualityOperators<TSelf, TSelf, bool>, IIncrementOperators<TSelf>, IMultiplicativeIdentity<TSelf, TSelf>, IMultiplyOperators<TSelf, TSelf, TSelf>, ISpanFormattable, ISpanParsable<TSelf>, ISubtractionOperators<TSelf, TSelf, TSelf>, IUnaryPlusOperators<TSelf, TSelf>, IUnaryNegationOperators<TSelf, TSelf> where TSelf : INumberBase<TSelf>?
- 24. https://mvc.tw 24 .C# 11 new features
- 25. https://mvc.tw 25 String Raw string literals UTF-8 string literals Pattern match Span<char> or ReadOnlySpan<char> on a constant string
- 26. https://mvc.tw Raw string literals ▪ 新的字串常值表示方式，使用三個雙引號 (成對) var s = "以前你要這麼寫 "雙引號"."; var s1 = """現在你可以這麼寫 "雙引號".""";
- 27. https://mvc.tw UTF-8 string literals string s1 = "魯夫"; var b1 = Encoding.Unicode.GetBytes(s1); ReadOnlySpan<byte> b2 = "魯夫"u8; Console.WriteLine(string.Join("-", b1)); Console.WriteLine(string.Join("-", b2.ToArray ())); var b3 = "魯夫"u8.ToArray();
- 28. https://mvc.tw Pattern match Span ▪ 允許 Span<char> 和 ReadOnlySpan<char> 與字串常值比對 static bool Is123(ReadOnlySpan<char> s) { return s is "123"; } static bool IsABC(Span<char> s) { return s switch { "ABC" => true, _ => false }; }
- 29. https://mvc.tw List Patterns ▪ 清單比對模式，可以比較集合或陣列內容 int[] array = { 1,9,8,7,6,5,3}; var result = array switch { [1, .. var s, 3] => string.Join("-", s), [1, 2] => "A", [2, 5] => "B", [1, _] => "C", [..] => "D" };
- 30. https://mvc.tw Generic Attribute public class TypeAttribute : Attribute { public TypeAttribute(Type t) => ParamType = t; public Type ParamType { get; } } public class TypeAttribute<T> : Attribute { }
- 32. https://mvc.tw Generic math support static virtual members in interfaces checked operator
- 33. https://mvc.tw static virtual members in interfaces public interface IMyAreaAddOperator<T> where T : IMyAreaAddOperator<T> { static abstract int operator + (T source ,T other); } public class MyRectangle : IMyAreaAddOperator<MyRectangle> { public int Width { get; set; } public int Height { get; set; } public int Area { get => Width * Height; } public static int operator +(MyRectangle source, MyRectangle other) { return source.Area + other.Area; } }
- 34. https://mvc.tw Generic math public class Rectangle : IAdditionOperators<Rectangle, Rectangle, int> { public int Width { get; set; } public int Height { get; set; } public int Area { get => Width * Height; } public static int operator +(Rectangle left, Rectangle right) { return left.Area + right.Area; } public static int operator checked+(Rectangle left, Rectangle right) { return left.Area + right.Area; } }
- 35. https://mvc.tw Auto-default struct public readonly struct Measurement { public Measurement(double value) { Value = value ;} public Measurement(double value, string description) { Value = value; Description = description; } public Measurement(string description) { // 會補上 //this.<Value>k__BackingField = 0.0; //this.<Description>k__BackingField = "Ordinary measurement"; Description = description; } public double Value { get; init; } public string Description { get; init; } = "Ordinary measurement"; public override string ToString() => $"{Value} ({Description})"; }
- 36. https://mvc.tw Extended nameof scope ▪ nameof 敘述可用於 method 與其 parameters 的 attribute 上 [Description(nameof(Main))] static void Main([Description(nameof(args))]string[] args)
- 37. https://mvc.tw File-scoped types ▪ 存取修飾，限制在同一個檔案內使用的型別 file class Class1 { public int a; } file class Class2 { public Class1? c; }
- 38. https://mvc.tw Required members ▪ 強迫在建立執行體時，成員必須初始化 public class Person { [SetsRequiredMembers] public Person(string firstName, string lastName) => (FirstName, LastName) = (firstName, lastName); public required string FirstName { get; init; } public required string LastName { get; init; } }
- 41. 41 天瓏資訊圖書