String.Join Method (String, 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 member Join : 
        separator:string * 
        value:string[] * 
        startIndex:int * 
        count:int -> 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.

startIndex
Type: System.Int32

The first element in value to use.

count
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.
-or-
String.Empty if count is zero, value has no elements, or separator and all the elements of value are String.Empty.

ExceptionCondition
ArgumentNullException

value is a null reference (Nothing in Visual Basic).

ArgumentOutOfRangeException

startIndex or count is less than 0.

-or-

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

OutOfMemoryException

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 a null reference (Nothing in Visual Basic), an empty string (String.Empty) is used instead. If any element in value is a null reference (Nothing in Visual Basic), an empty string is used instead.

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

No code example is currently available or this language may not be supported.

.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

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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