HierarchicalDataSourceControl.GetHierarchicalView Method (String)
Gets the view helper object for the IHierarchicalDataSource interface for the specified path.
Assembly: System.Web (in System.Web.dll)
Protected MustOverride Function GetHierarchicalView ( viewPath As String ) As HierarchicalDataSourceView
Parameters
- viewPath
-
Type:
System.String
The hierarchical path of the view to retrieve.
Return Value
Type: System.Web.UI.HierarchicalDataSourceViewA HierarchicalDataSourceView that represents a single view of the data at the hierarchical level identified by the viewPath parameter.
This GetHierarchicalView method provides the default implementation for the HierarchicalDataSourceControl class, which simply returns null. Classes that derive from the HierarchicalDataSourceControl class override this method and provide an implementation to return a strongly typed view that derives from HierarchicalDataSourceView.
The following code example demonstrates how to override the GetHierarchicalView method in a class that extends the HierarchicalDataSourceControl class to return a strongly typed HierarchicalDataSourceView object. This code example is part of a larger example provided for the HierarchicalDataSourceControl class.
Imports System Imports System.Collections Imports System.IO Imports System.Runtime.InteropServices Imports System.Security.Permissions Imports System.Web Imports System.Web.UI Imports System.Web.UI.WebControls Namespace Samples.AspNet Public Class FileSystemDataSource Inherits HierarchicalDataSourceControl Public Sub New() End Sub Private view As FileSystemDataSourceView = Nothing Protected Overrides Function GetHierarchicalView( _ ByVal viewPath As String) As HierarchicalDataSourceView view = New FileSystemDataSourceView(viewPath) Return view End Function End Class
Available since 2.0