Marshal 是一個用來處理非託管記憶體的方法集合。主要有以下功能：
- 分配非託管記憶體
- 複製非託管記憶體區塊
- 將託管類型轉換成非託管類型
- 其它與非託管程式碼互動的方法
範例 1：在非託管記憶體寫入 1~20
using System.Runtime.InteropServices;
using System.Text;
namespace Playground
{
internal class Program
{
private static void Main()
{
var sb = new StringBuilder();
// Request memory block for 20 bytes
nint hglobal = Marshal.AllocHGlobal(20);
try
{
// Write 1~20 to the memory
for (int i = 0; i < 20; i++)
{
Marshal.WriteByte(hglobal, i, (byte)(i + 1));
}
// Print the memory to the console
for (int i = 0; i < 20; i++)
{
sb.Append(Marshal.ReadByte(hglobal, i));
sb.Append(' ');
}
Console.WriteLine(sb.ToString());
Console.ReadLine();
}
finally
{
Marshal.FreeHGlobal(hglobal);
}
}
}
}範例 2：來回轉換 string 與 IntPtr(nint)
using System.Runtime.InteropServices;
namespace Playground
{
internal class Program
{
private static void Main()
{
nint hglobal = Marshal.StringToHGlobalUni("Hello World!!");
try
{
string? text = Marshal.PtrToStringUni(hglobal);
Console.WriteLine(text != null ? text.ToString() : "NULL");
Console.ReadLine();
}
finally
{
Marshal.FreeHGlobal(hglobal);
}
}
}
}