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C#: record
聲明一個類型,該類型具有按值、格式和支援產生的比較。記錄類別-參考;記錄結構體-值type。
簡單範例 (Example.cs)
請將此範例另存為 Example.cs,並與本頁其他範例分開執行。
Example.cs:
// PROJECT-EXAMPLE
var first = new Item("ore");
var second = new Item("ore");
System.Console.WriteLine(first == second);
record Item(string Name);
結果:
True
句法
record Person(string Name); / readonly record struct Point(int X, int Y);
例1:基本形式
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)
{
Person first = new("Archer");
Person second = new("Archer");
Console.WriteLine(first == second);
}
}
public record Person(string Name);
例2:另一種實用形式
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)
{
Point start = new(2, 3);
Point next = start with { X = 8 };
Console.WriteLine($"{start} -> {next}");
}
}
public readonly record struct Point(int X, int Y);
官方來源:Microsoft學習。