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VirtualDirectory Class

Represents a directory object in a virtual file or resource space.

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

public abstract class VirtualDirectory extends VirtualFileBase

The VirtualDirectory class is the base class for objects that represent directories in a virtual file system. Typically, you would implement a descendent of the VirtualDirectory class for each VirtualPathProvider class descendent in your Web application.

Notes to Inheritors:

When you inherit from the VirtualDirectory class, you must override the Children, Directories, and Files properties to return an object implementing the IEnumerable interface.

If your virtual-directory structure contains moderate to large numbers of virtual resources, you should take care to minimize the system resources consumed when enumerating the virtual directory by calling the Children, Directories, or Files properties.

The following code example is a VirtualDirectory class implementation that returns virtual directory information stored in a DataSet object. This code works with the code examples for the VirtualPathProvider and VirtualFile classes to provide virtual resources from a data store that is loaded into a DataSet object. For the complete instructions for compiling and running the example, see the Example section of the VirtualPathProvider class overview.

This example has two parts, the VirtualDirectory class implementation and the XML data file used to populate the DataSet object.

The first code example is an implementation of the VirtualDirectory class. In the constructor it uses a method on a custom VirtualPathProvider object to return a DataSet object. It then searches the DataSet object to retrieve the directory information associated with the virtual path provided.

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

The second example is the XML data file used to populate the DataSet object returned by the custom VirtualPathProvider object. This XML data is used to demonstrate using the VirtualPathProvider, VirtualFile, and VirtualDirectory classes to retrieve data from external data, and is not intended to represent a production-quality data store.

<?xml version="1.0" encoding="utf-8" ?>
  <resource type="dir" 
    path="/vrDir" 
    parentPath="" 
    content="">
    <resource type="file" 
      path="/vrDir/Level1FileA.vrf"
      parentPath="/vrDir" 
      content="This is the content of file Level1FileA." >
    </resource>
    <resource type="file" 
      path="/vrDir/Level1FileB.vrf"
      parentPath="/vrDir" 
      content="This is the content of file Level1FileB.">
    </resource>
    <resource type="dir" 
      path="/vrDir/Level2DirA" 
      parentPath="/vrDir" 
      content="">
        <resource type="file" 
          path="/vrDir/Level2DirA/Level2FileA.vrf" 
          parentPath="/vrDir/Level2DirA" 
          content="This is the content of file Level2FileA." >
        </resource>
        <resource type="file" 
          path="/vrDir/Level2DirA/Level2FileB.vrf"
          parentPath="/vrDir/Level2DirA" 
          content="This is the content of file Level2FileB.">
        </resource>
    </resource>
    <resource type="dir" 
      path="/vrDir/Level2DirB" 
      parentPath="/vrDir" 
      content="">
      <resource type="file" 
        path="/vrDir/Level2DirB/Level2FileA.vrf" 
        parentPath="/vrDir/Level2DirB" 
        content="This is the content of file Level2FileA." >
      </resource>
      <resource type="file" 
        path="/vrDir/Level2DirB/Level2FileB.vrf"
        parentPath="/vrDir/Level2DirB" 
        content="This is the content of file Level2FileB.">
       </resource>
    </resource>
  </resource>

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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.

.NET Framework

Supported in: 3.5, 3.0, 2.0

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