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String::Join Method (String, array<String>, Int32, Int32)

Concatenates the specified elements of a string array, using the specified separator between each element.

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

static String^ Join(
	String^ separator, 
	array<String^>^ value, 
	int startIndex, 
	int count


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.

Type: array<System::String>

An array that contains the elements to concatenate.

Type: System::Int32

The first element in value to use.

Type: System::Int32

The number of elements of value to use.

Return Value

Type: System::String
A string that consists of the strings in value delimited by the separator string.
String::Empty if count is zero, value has no elements, or separator and all the elements of value are String::Empty.


value is nullptr.


startIndex or count is less than 0.


startIndex plus count is greater than the number of elements in value.


Out of memory.

For example, if separator is ", " and the elements of value are "apple", "orange", "grape", and "pear", Join(separator, value, 1, 2) returns "orange, grape".

If separator is nullptr, an empty string (String::Empty) is used instead. If any element in value is nullptr, an empty string is used instead.

The following example concatenates two elements from an array of names of fruit.

// Sample for String::Join(String, String[], int int) 
using namespace System;
int main()
   array<String^>^val = {"apple","orange","grape","pear"};
   String^ sep = ", ";
   String^ result;
   Console::WriteLine( "sep = '{0}'", sep );
   Console::WriteLine( "val[] = {{'{0}' '{1}' '{2}' '{3}'}}", val[ 0 ], val[ 1 ], val[ 2 ], val[ 3 ] );
   result = String::Join( sep, val, 1, 2 );
   Console::WriteLine( "String::Join(sep, val, 1, 2) = '{0}'", result );

This example produces the following results:
sep = ', '
val[] = {'apple' 'orange' 'grape' 'pear'}
String::Join(sep, val, 1, 2) = 'orange, grape'

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Portable Class Library

Supported in: Portable Class Library
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