String.Join Method (String, String())
Concatenates all the elements of a string array, using the specified separator between each element.
Assembly: mscorlib (in mscorlib.dll)
Public Shared Function Join ( separator As String, ParamArray value As String() ) As String
Parameters
- separator
-
Type:
System.String
The string to use as a separator. separator is included in the returned string only if value has more than one element.
- value
-
Type:
System.String()
An array that contains the elements to concatenate.
Return Value
Type: System.StringA string that consists of the elements in value delimited by the separator string. If value is an empty array, the method returns String.Empty.
| Exception | Condition |
|---|---|
| ArgumentNullException | value is null. |
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 null, an empty string (String.Empty) is used instead. If any element in value is null, an empty string is used instead.
The following example demonstrates the Join method.
Imports System Public Class JoinTest Public Shared Sub Main() Console.WriteLine(MakeLine(0, 5, ", ")) Console.WriteLine(MakeLine(1, 6, " ")) Console.WriteLine(MakeLine(9, 9, ": ")) Console.WriteLine(MakeLine(4, 7, "< ")) End Sub 'Main Private Shared Function MakeLine(initVal As Integer, multVal As Integer, 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 ' The example displays the following output: ' 0 , 5 , 10 , 15 , 20 , 25 , 30 , 35 , 40 , 45 ' 6 12 18 24 30 36 42 48 54 60 ' 81 : 90 : 99 : 108: 117: 126: 135: 144: 153: 162 ' 28 < 35 < 42 < 49 < 56 < 63 < 70 < 77 < 84 < 91
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1