Add Method

IntPtr.Add Method (IntPtr, Int32)

.NET Framework (current version)
 

Adds an offset to the value of a pointer.

Namespace:   System
Assembly:  mscorlib (in mscorlib.dll)

public static IntPtr Add(
	IntPtr pointer,
	int offset
)

Parameters

pointer
Type: System.IntPtr

The pointer to add the offset to.

offset
Type: System.Int32

The offset to add.

Return Value

Type: System.IntPtr

A new pointer that reflects the addition of offset to pointer.

The Add method does not throw an exception if the result is too large to represent as a pointer on the specified platform. Instead, the addition operation is performed in an unchecked context.

Languages that do not support operator overloading or custom operators can use this method to add an offset to the value of a pointer.

The following example instantiates an IntPtr object that points to the beginning of a ten-element array, and then calls the Add method to iterate the elements in the array.

using System;
using System.Runtime.InteropServices;

public class Example
{
   public static void Main()
   {
      int[] arr = { 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 };
      unsafe {
         fixed(int* parr = arr) {
            IntPtr ptr = new IntPtr(parr);
            // Get the size of an array element.
            int size = sizeof(int);
            for (int ctr = 0; ctr < arr.Length; ctr++)
            {
               IntPtr newPtr = IntPtr.Add(ptr, ctr * size);
               Console.Write("{0}   ", Marshal.ReadInt32(newPtr));
            }
         }      
      }
   }
}
// The example displays the following output:
//       2   4   6   8   10   12   14   16   18   20

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1
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