自從微軟擁抱開源以後， .NET 與 C# 的版本有如潮水般一波一波無情的打在開發者身上，更新如此的快到底有沒有我們需要的功能？專案進度就在燒要如何掌握新特性？ 不要怕！全村的希望 Bill Chung 來了，這場將快速帶你了解新版本改善了哪些效能，增強了多少開發效率，支援什麼更先進的語言特性。現在，就讓我們跟者全村的希望一起幽雅的品嘗 C# 11 與 .NET 7 為我們帶來的新世界。

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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

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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

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Agenda
3
#
.NET
7

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Agenda
4
▪ .NET MAUI
▪ ASP.NET Core Migrations
▪ Cloud Native
▪ Performance
▪ WebSockets over HTTP/2
▪ New APIs
#
.NET
7

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.NET
7
Agenda
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▪ String
▪ List patterns
▪ Generic attribute
▪ Generic math support
▪ Auto-default struct
▪ Extended nameof scope
▪ File-Scoped types
▪ Required members
#

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.NET 7 new features

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.NET MAUI
▪ 新增支援 Tizen
▪ 更多的控制項
▪ 更好的效能

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ASP.NET Core Migrations
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Migrate ASP.NET to ASP.NET Core
瀏覽
https://aka.ms/AspNetCoreMigration
安裝
Microsoft Project Migrations (Experimental)

10. Migration steps

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External
traffic
ASP.NET Business logic
External
traffic
ASP.NET Core
ASP.NET
Business logic
YARP proxy

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External
traffic
ASP.NET Core
ASP.NET
Business logic
Adapters
YARP proxy

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External
traffic
ASP.NET Core Business logic
Adapters
External
traffic
ASP.NET Core Business logic

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Installation

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Cloud Native
▪ gRPC JSON transcoding for .NET
▪ Built-in container support for the .NET SDK
▪ Azure v4 support .NET 7

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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}"
};
}
}

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built-in container support for the .NET SDK
▪ support Linux container
▪ just dotnet publish

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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

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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 { }
};
}

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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 { } };
}

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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";

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APIs
▪ INumberBase<T> …
▪ Added new Tar APIs
▪ Adding Microseconds and Nanoseconds to TimeStamp,
DateTime, DateTimeOffset, and TimeOnly

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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>?

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.C# 11 new features

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String
Raw string literals
UTF-8 string literals
Pattern match Span<char> or
ReadOnlySpan<char> on a constant
string

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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".""";

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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();

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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 };
}

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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"
};

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Generic Attribute
public class TypeAttribute : Attribute
{
public TypeAttribute(Type t) => ParamType = t;
public Type ParamType { get; }
}
public class TypeAttribute<T> : Attribute { }

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[ServiceFilter(typeof(ResponseLoggerFilter))]
[ServiceFilter<ResponseLoggerFilter>]
Possible future

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Generic math support
static virtual members in interfaces
checked operator

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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;
}
}

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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;
}
}

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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})";
}

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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)

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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;
}

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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; }
}

39. Blog 是記錄知識的最佳平台
39
https://dotblogs.com.tw

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SkillTree 為了確保內容與實務不會脫節，我們都是聘請企業顧問等級
並且目前依然在職場的業界講師，我們不把時間浪費在述說歷史與沿革，
我們並不是教您考取證照，而是教您如何上場殺敵，拳拳到肉的內容才
是您花錢想要聽到的，而這也剛好是我們擅長的。
https://skilltree.my

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