ArraySegment(Of T) Structure
Delimits a section of a one-dimensional array.
Assembly: mscorlib (in mscorlib.dll)
ArraySegment(Of T) is a wrapper around an array that delimits a range of elements in that array. Multiple ArraySegment(Of T) instances can refer to the same original array and can overlap.
The Array property returns the entire original array, not a copy of the array; therefore, changes made to the array returned by the Array property are made to the original array.
The original array must be one-dimensional and must have zero-based indexing.
The following code example passes an ArraySegment(Of T) structure to a method.
Imports System Public Class SamplesArray Public Shared Sub Main() ' Create and initialize a new string array. Dim myArr As String() = {"The", "quick", "brown", "fox", "jumps", "over", "the", "lazy", "dog"} ' Display the initial contents of the array. Console.WriteLine("The original array initially contains:") PrintIndexAndValues(myArr) ' Define an array segment that contains the entire array. Dim myArrSegAll As New ArraySegment(Of String)(myArr) ' Display the contents of the ArraySegment. Console.WriteLine("The first array segment (with all the array's elements) contains:") PrintIndexAndValues(myArrSegAll) ' Define an array segment that contains the middle five values of the array. Dim myArrSegMid As New ArraySegment(Of String)(myArr, 2, 5) ' Display the contents of the ArraySegment. Console.WriteLine("The second array segment (with the middle five elements) contains:") PrintIndexAndValues(myArrSegMid) ' Modify the fourth element of the first array segment myArrSegAll. myArrSegAll.Array(3) = "LION" ' Display the contents of the second array segment myArrSegMid. ' Note that the value of its second element also changed. Console.WriteLine("After the first array segment is modified, the second array segment now contains:") PrintIndexAndValues(myArrSegMid) End Sub 'Main Public Shared Sub PrintIndexAndValues(arrSeg As ArraySegment(Of String)) Dim i As Integer For i = arrSeg.Offset To (arrSeg.Offset + arrSeg.Count - 1) Console.WriteLine(" [{0}] : {1}", i, arrSeg.Array(i)) Next i Console.WriteLine() End Sub 'PrintIndexAndValues Public Shared Sub PrintIndexAndValues(myArr as String()) Dim i As Integer For i = 0 To (myArr.Length - 1) Console.WriteLine(" [{0}] : {1}", i, myArr(i)) Next i Console.WriteLine() End Sub 'PrintIndexAndValues End Class 'SamplesArray 'This code produces the following output. ' 'The original array initially contains: ' [0] : The ' [1] : quick ' [2] : brown ' [3] : fox ' [4] : jumps ' [5] : over ' [6] : the ' [7] : lazy ' [8] : dog ' 'The first array segment (with all the array's elements) contains: ' [0] : The ' [1] : quick ' [2] : brown ' [3] : fox ' [4] : jumps ' [5] : over ' [6] : the ' [7] : lazy ' [8] : dog ' 'The second array segment (with the middle five elements) contains: ' [2] : brown ' [3] : fox ' [4] : jumps ' [5] : over ' [6] : the ' 'After the first array segment is modified, the second array segment now contains: ' [2] : brown ' [3] : LION ' [4] : jumps ' [5] : over ' [6] : the
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The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.