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Codex edited this page Oct 11, 2026 · 2 revisions

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指針操作

使用手冊C# · 實用指南

& 取得位址,* 為指標命名,-> 存取指標目標的成員。需要不安全和記憶體壽命合規性。

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
unsafe
{
    int value = 3;
    int* pointer = &value;
    *pointer = 7;
    System.Console.WriteLine(value);
}

請在專案中啟用 <AllowUnsafeBlocks>true</AllowUnsafeBlocks>。指標僅在所示範圍內有效。

結果:

7

句法

Type* pointer = &value; / *pointer / pointer->Member

範例1

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)
    {
        unsafe { int value = 3; int* pointer = &value; *pointer = 9; Console.WriteLine(value); }
    }
}

範例2

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)
    {
        unsafe { Point value = new() { X = 2 }; Point* pointer = &value; pointer->X += 5; Console.WriteLine(value.X); }
    }
}
public struct Point { public int X; }

官方來源:Microsoft學習。

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