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HttpListenerPrefixCollection.Contains Method

Returns a Boolean value that indicates whether the specified prefix is contained in the collection.

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

Public Function Contains ( _
	uriPrefix As String _
) As Boolean


Type: System.String
A String that contains the Uniform Resource Identifier (URI) prefix to test.

Return Value

Type: System.Boolean
true if this collection contains the prefix specified by uriPrefix; otherwise, false.


ICollection(Of T).Contains(T)


uriPrefix is Nothing.

The specified prefix must exactly match an existing value.

The following code example checks to see whether a user-specified prefix is contained in the prefix collection of an HttpListener.

Public Shared Function CheckForPrefix(ByVal listener As HttpListener, ByVal prefix As String) As Boolean
    ' Get the prefixes that the Web server is listening to.
    Dim prefixes As HttpListenerPrefixCollection = listener.Prefixes
    If prefixes.Count = 0 OrElse prefix Is Nothing Then
        Return False
    End If
    Return prefixes.Contains(prefix)
End Function

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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