IntPtr.Add(IntPtr, Int32) Method

Definition

Adds an offset to a signed integer.

public static IntPtr Add (IntPtr pointer, int offset);

Parameters

pointer
IntPtr

The signed integer to add the offset to.

offset
Int32

The offset to add.

Returns

IntPtr

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

Examples

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

Remarks

The Add method does not throw an exception if the result is too large to represent as a signed integer in the executing process. 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.

Applies to

製品 バージョン
.NET Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9
.NET Framework 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 2.0, 2.1
UWP 10.0

See also