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String.Join Method (String, String[])

Silverlight

Updated: January 2011

Concatenates a specified separator String between each element of a specified String array, yielding a single concatenated string.

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

Syntax

public static string Join(
	string separator,
	params string[] value
)

Parameters

separator: Type: System.String
The string to use as a separator.

value: Type: 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 null.

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 null, an empty string (Empty) is used instead. If any element in value is null, an empty string is used instead.

Examples

The following example demonstrates the Join method.


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);
   }
}