Csharp/CSharp Tutorial/unsafe/IntPtr

Fixing Managed Data in Memory

using System;
   
public class MyClass
{
    public unsafe static void Main()
    {
        int ArrayIndex;
        int [] IntegerArray;
   
        IntegerArray = new int [5];
        fixed(int * IntegerPointer = IntegerArray)
        {
            for(ArrayIndex = 0; ArrayIndex < 5; ArrayIndex++)
                IntegerPointer[ArrayIndex] = ArrayIndex;
        }
        for(ArrayIndex = 0; ArrayIndex < 5; ArrayIndex++)
            Console.WriteLine(IntegerArray[ArrayIndex]);
    }
}

IntPtr.Zero

using System;
using System.Runtime.InteropServices;
public class MainClass
{
  [STAThread]
  static void Main(string[] args)
  {
    IntPtr ptr = IntPtr.Zero;
    ptr = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(int)));
    Marshal.FreeHGlobal(ptr);
  }
}