ZH TW CSharp Keyword get

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C#: get

使用手冊C# · 實用指南

讀取屬性或索引器的值；可以進行計算。

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
System.Console.WriteLine(new Item().Count);
class Item { public int Count { get { return 3; } } }

結果:

3

句法

get => expression; / get { return expression; }

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)
    {
        Meter value = new();
        value.Amount = -2;
        Console.WriteLine(value.Amount);
    }
}
public class Meter { private int amount; public int Amount { get => amount; set => amount = Math.Max(0, value); } }

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)
    {
        Storage storage = new();
        storage[0] = "ore";
        Console.WriteLine(storage[0]);
    }
}
public class Storage { private readonly string[] values = new string[2]; public string this[int index] { get => values[index]; set => values[index] = value; } }

官方來源：Microsoft學習。