C# 申请非托管内存

方式一：使用 stackalloc 关键字

int* block = stackalloc int[100];  

注：以下代码导致编译器错误。 

int* block;  
// The following assignment statement causes compiler errors. You  
// can use stackalloc only when declaring and initializing a local   
// variable.  
block = stackalloc int[100];  

类

IntPtr hglobal = Marshal.AllocHGlobal(100);
Marshal.FreeHGlobal(hglobal);