Array.SetValue Method (Object, Int32)

July 28, 2014

Sets a value to the element at the specified position in the one-dimensional Array. The index is specified as a 32-bit integer.

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

public void SetValue(
	Object value,
	int index
)

Parameters

value
Type: System.Object
The new value for the specified element.
index
Type: System.Int32
A 32-bit integer that represents the position of the Array element to set.

ExceptionCondition
ArgumentException

The current Array does not have exactly one dimension.

InvalidCastException

value cannot be cast to the element type of the current Array.

IndexOutOfRangeException

index is outside the range of valid indexes for the current Array.

The GetLowerBound and GetUpperBound methods can determine whether the value of index is out of bounds.

For more information about conversions, see Convert.

This method is an O(1) operation.

NoteNote:

If SetValue is used to assign null to an element of an array of value types, all fields of the element are initialized to zero. The value of the element is not a null reference, and cannot be found by searching for a null reference.

Version Notes

Windows Phone

 If you pass an invalid value to Array.SetValue(System.Object,System.Int32), the method throws InvalidCaseException instead of ArgumentException.

The following code example demonstrates how to set and get a specific value in a one-dimensional or multidimensional array.


using System;

public class Example
{

   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {

      // Creates and initializes a one-dimensional array.
      String[] myArr1 = new String[5];

      // Sets the element at index 3.
      myArr1.SetValue("three", 3);
      outputBlock.Text += String.Format("[3]:   {0}", myArr1.GetValue(3)) + "\n";


      // Creates and initializes a two-dimensional array.
      String[,] myArr2 = new String[5, 5];

      // Sets the element at index 1,3.
      myArr2.SetValue("one-three", 1, 3);
      outputBlock.Text += String.Format("[1,3]:   {0}", myArr2.GetValue(1, 3)) + "\n";


      // Creates and initializes a three-dimensional array.
      String[, ,] myArr3 = new String[5, 5, 5];

      // Sets the element at index 1,2,3.
      myArr3.SetValue("one-two-three", 1, 2, 3);
      outputBlock.Text += String.Format("[1,2,3]:   {0}", myArr3.GetValue(1, 2, 3)) + "\n";


      // Creates and initializes a seven-dimensional array.
      String[, , , , , ,] myArr7 = new String[5, 5, 5, 5, 5, 5, 5];

      // Sets the element at index 1,2,3,0,1,2,3.
      int[] myIndices = new int[7] { 1, 2, 3, 0, 1, 2, 3 };
      myArr7.SetValue("one-two-three-zero-one-two-three", myIndices);
      outputBlock.Text += String.Format("[1,2,3,0,1,2,3]:   {0}", myArr7.GetValue(myIndices)) + "\n";

   }

}


/* 
This code produces the following output.

[3]:   three
[1,3]:   one-three
[1,2,3]:   one-two-three
[1,2,3,0,1,2,3]:   one-two-three-zero-one-two-three

*/



Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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