FR CSharp Keyword where generic type constraint - LIHACHTETAN/ClassicUO-Bad-Newbie-CSharp-Scripts-IDE GitHub Wiki
Українська · Русский · English · Deutsch · Français · Italiano · Español · 繁體中文 · 日本語 · 한국어
Spécifie les exigences des paramètres de type : classe de base, interface, classe/struct, new(), notnull, non géré et autres combinaisons autorisées.
Enregistrez cet exemple séparément dans Example.cs. Exécutez-le indépendamment des autres exemples de cette page.
Example.cs:
// PROJECT-EXAMPLE
T Create<T>() where T : new() => new T();
System.Console.WriteLine(Create<Item>().Name);
class Item { public string Name => "Ore"; }Résultat:
Ore
where T : constraint1, constraint2using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;
public static class Program
{
public static async Task Main(string[] args)
{
Counter counter = Factory.Create<Counter>();
Console.WriteLine(counter.Value);
}
}
public class Counter { public int Value => 7; }
public static class Factory { public static T Create<T>() where T : class, new() => new T(); }using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;
public static class Program
{
public static async Task Main(string[] args)
{
Console.WriteLine(Values.Sum<Number>());
}
}
public interface IValue { int Value { get; } }
public readonly struct Number : IValue { public int Value => 5; }
public static class Values { public static int Sum<T>() where T : struct, IValue { T value = new(); return value.Value; } }Source officielle : Microsoft Apprendre.