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)
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.
using System; public class JoinTest { public static void Main() { Console.WriteLine(MakeLine(0, 5, ", ")); Console.WriteLine(MakeLine(1, 6, " ")); Console.WriteLine(MakeLine(9, 9, ": ")); Console.WriteLine(MakeLine(4, 7, "< ")); } 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); } } // 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
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
