C# 内存分配与释放示例

原文地址：https://msdn.microsoft.com/zh-cn/library/ms146631.aspx

using System;
using System.Runtime.InteropServices;
 
class Example
{
 
    static void Main()
    {
        // Create a managed array.
        byte[] managedArray = { 1, 2, 3, 4 };
 
        // Initialize unmanaged memory to hold the array.
        int size = Marshal.SizeOf(managedArray[0]) * managedArray.Length;
 
        IntPtr pnt = Marshal.AllocHGlobal(size);
 
        try
        {
            // Copy the array to unmanaged memory.
            Marshal.Copy(managedArray, 0, pnt, managedArray.Length);
 
            // Copy the unmanaged array back to another managed array.
 
            byte[] managedArray2 = new byte[managedArray.Length];
 
            Marshal.Copy(pnt, managedArray2, 0, managedArray.Length);
 
            Console.WriteLine("The array was copied to unmanaged memory and back.");
 
        }
        finally
        {
            // Free the unmanaged memory.
            Marshal.FreeHGlobal(pnt);
        }
 
 
 
    }
 
}