Partager via


String.Concat Method (Object, Object, Object)

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

Updated: October 2010

Concatenates the String representations of three specified objects.

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

Syntax

'Declaration
Public Shared Function Concat ( _
    arg0 As Object, _
    arg1 As Object, _
    arg2 As Object _
) As String
public static string Concat(
    Object arg0,
    Object arg1,
    Object arg2
)

Parameters

Return Value

Type: System.String
The concatenated string representations of the values of arg0, arg1, and arg2.

Remarks

The method concatenates arg0, arg1, and arg2 by calling the parameterless ToString method of each object; it does not add any delimiters.

String.Empty is used in place of any null argument.

Examples

The following code example demonstrates the Concat method.

 _

Class Example

   Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
      Dim i As Integer = -123
      Dim o As [Object] = i
      Dim objs() As [Object] = {-123, -456, -789}

      outputBlock.Text += String.Format("Concatenate 1, 2, and 3 objects:") & vbCrLf
      outputBlock.Text += String.Format("1) {0}", [String].Concat(o)) & vbCrLf
      outputBlock.Text += String.Format("2) {0}", [String].Concat(o, o)) & vbCrLf
      outputBlock.Text += String.Format("3) {0}", [String].Concat(o, o, o)) & vbCrLf

      outputBlock.Text &= vbCrLf & "Concatenate 4 objects and a variable length parameter list:" & vbCrLf
      outputBlock.Text += String.Format("4) {0}", [String].Concat(o, o, o, o, o)) & vbCrLf

      outputBlock.Text &= vbCrLf & "Concatenate a 3 element object array:" & vbCrLf
      outputBlock.Text += String.Format("5) {0}", [String].Concat(objs)) & vbCrLf
   End Sub 'Main
End Class 'stringConcat5
'
'This example produces the following output:
'Concatenate 1, 2, and 3 objects:
'1) -123
'2) -123-123
'3) -123-123-123
'
'Concatenate 4 objects and a variable length parameter list:
'4) -123-123-123-123-123
'
'Concatenate a 3 element object array:
'5) -123-456-789
'
using System;

class Example
{
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      int i = -123;
      Object o = i;
      Object[] objs = new Object[] { -123, -456, -789 };

      outputBlock.Text += String.Format("Concatenate 1, 2, and 3 objects:") + "\n";
      outputBlock.Text += String.Format("1) {0}", String.Concat(o)) + "\n";
      outputBlock.Text += String.Format("2) {0}", String.Concat(o, o)) + "\n";
      outputBlock.Text += String.Format("3) {0}", String.Concat(o, o, o)) + "\n";

      outputBlock.Text += "\nConcatenate 4 objects and a variable length parameter list:" + "\n";
      outputBlock.Text += String.Format("4) {0}", String.Concat(o, o, o, o, o)) + "\n";

      outputBlock.Text += "\nConcatenate a 3 element object array:" + "\n";
      outputBlock.Text += String.Format("5) {0}", String.Concat(objs)) + "\n";
   }
}
/*
This example produces the following output:
Concatenate 1, 2, and 3 objects:
1) -123
2) -123-123
3) -123-123-123

Concatenate 4 objects and a variable length parameter list:
4) -123-123-123-123-123

Concatenate a 3 element object array:
5) -123-456-789
*/

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.

Change History

Date

History

Reason

October 2010

Revised the Remarks section.

Customer feedback.