VirtualPathProvider.FileExists Method (System.Web.Hosting)

FileExists Method

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This page is specific to

Microsoft Visual Studio 2010/.NET Framework 4

Other versions are also available for the following:

.NET Framework Class Library

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)

Syntax

Visual Basic

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

public virtual bool FileExists(
    string virtualPath
)

Visual C++

public:
virtual bool FileExists(
    String^ virtualPath
)

abstract FileExists : 
        virtualPath:string -> bool 
override FileExists : 
        virtualPath:string -> bool

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.

Remarks

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.

Examples

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.

Visual Basic

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

public override bool FileExists(string virtualPath)
{
  if (IsPathVirtual(virtualPath))
  {
    SampleVirtualFile file = (SampleVirtualFile)GetFile(virtualPath);
    return file.Exists;
  }
  else
    return Previous.FileExists(virtualPath);
}

Version Information

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

Platforms

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.

Reference

VirtualPathProvider Class

System.Web.Hosting Namespace