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VirtualPathProvider.FileExists Method

Gets a value that indicates whether a file exists in the virtual file system.

Namespace:  System.Web.Hosting
Assembly:  System.Web (in System.Web.dll)

'Declaration
Public Overridable Function FileExists ( _
	virtualPath As String _
) As Boolean

Parameters

virtualPath
Type: System.String

The path to the virtual file.

Return Value

Type: System.Boolean
true if the file exists in the virtual file system; otherwise, false.

Override the FileExists method to indicate to the compilation system that the resource represented by virtualPath exists in the virtual file system provided by this VirtualPathProvider instance.

The following code example is an implementation of the FileExists method in a custom VirtualPathProvider class. For the full code required to run the example, see the Example section of the VirtualPathProvider class overview topic.

Public Overrides Function FileExists(ByVal virtualPath As String) As Boolean 
  If (IsPathVirtual(virtualPath)) Then 
    Dim file As SampleVirtualFile
    file = CType(GetFile(virtualPath), SampleVirtualFile)
    Return file.Exists
  Else 
    Return Previous.FileExists(virtualPath)
  End If 
End Function

.NET Framework

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

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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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