Artigo
11/18/2011

Array.SetValue Method (Object, Int32)

Microsoft Silverlight will reach end of support after October 2021. Learn more.

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)

Syntax

'Declaration
<SecuritySafeCriticalAttribute> _
Public Sub SetValue ( _
    value As Object, _
    index As Integer _
)

[SecuritySafeCriticalAttribute]
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.

Exceptions

Exception	Condition
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.

Remarks

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.

Note:
If SetValue is used to assign nulla null reference (Nothing in Visual Basic) 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.

Platform Notes

Silverlight for Windows Phone

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

Examples

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


Public Class Example

   Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)

      ' Creates and initializes a one-dimensional array.
      Dim myArr1(4) As [String]

      ' Sets the element at index 3.
      myArr1.SetValue("three", 3)
      outputBlock.Text += String.Format("[3]:   {0}", myArr1.GetValue(3)) & vbCrLf


      ' Creates and initializes a two-dimensional array.
      Dim myArr2(5, 5) As [String]

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


      ' Creates and initializes a three-dimensional array.
      Dim myArr3(5, 5, 5) As [String]

      ' 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)) & vbCrLf


      ' Creates and initializes a seven-dimensional array.
      Dim myArr7(5, 5, 5, 5, 5, 5, 5) As [String]

      ' Sets the element at index 1,2,3,0,1,2,3.
      Dim myIndices() As Integer = {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)) & vbCrLf

   End Sub 'Main 

End Class 'SamplesArray


'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

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

*/

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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