String.Join Method (String, array<String[])
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Updated: January 2011
Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
Public Shared Function Join ( _
separator As String, _
ParamArray value As String() _
) As String
public static string Join(
string separator,
params string[] value
)
Parameters
- separator
Type: System.String
The string to use as a separator.
- value
Type: array<System.String[]
An array that contains the elements to concatenate.
Return Value
Type: System.String
A string that consists of the elements in value delimited by the separator string. If value is an empty array, the method returns String.Empty.
Exceptions
| Exception | Condition |
|---|---|
| ArgumentNullException | value is nulla null reference (Nothing in Visual Basic). |
Remarks
For example if separator is ", " and the elements of value are "apple", "orange", "grape", and "pear", Join(separator, value) returns "apple, orange, grape, pear".
If separator is nulla null reference (Nothing in Visual Basic), an empty string (Empty) is used instead. If any element in value is nulla null reference (Nothing in Visual Basic), an empty string is used instead.
Examples
The following example demonstrates the Join method.
Public Class Example
Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
outputBlock.Text += String.Format(MakeLine(0, 5, ", ")) & vbCrLf
outputBlock.Text += String.Format(MakeLine(1, 6, " ")) & vbCrLf
outputBlock.Text += String.Format(MakeLine(9, 9, ": ")) & vbCrLf
outputBlock.Text += String.Format(MakeLine(4, 7, "< ")) & vbCrLf
End Sub 'Main
Private Shared Function MakeLine(ByVal initVal As Integer, ByVal multVal As Integer, ByVal sep As String) As String
Dim sArr(10) As String
Dim i As Integer
For i = initVal To (initVal + 10) - 1
sArr((i - initVal)) = [String].Format("{0,-3}", i * multVal)
Next i
Return [String].Join(sep, sArr)
End Function 'MakeLine
End Class 'JoinTest
using System;
public class Example
{
public static void Demo(System.Windows.Controls.TextBlock outputBlock)
{
outputBlock.Text += String.Format(MakeLine(0, 5, ", ")) + "\n";
outputBlock.Text += String.Format(MakeLine(1, 6, " ")) + "\n";
outputBlock.Text += String.Format(MakeLine(9, 9, ": ")) + "\n";
outputBlock.Text += String.Format(MakeLine(4, 7, "< ")) + "\n";
}
private static string MakeLine(int initVal, int multVal, string sep)
{
string[] sArr = new string[10];
for (int i = initVal; i < initVal + 10; i++)
sArr[i - initVal] = String.Format("{0,-3}", i * multVal);
return String.Join(sep, sArr);
}
}
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 |
|---|---|---|
January 2011 |
Noted that an empty string is substituted for any null element in the array. |
Customer feedback. |