This documentation is archived and is not being maintained.

SiteMapProvider.RootProvider Property

Gets the root SiteMapProvider object in the current provider hierarchy.

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

public virtual SiteMapProvider RootProvider { get; }

Property Value

Type: System.Web.SiteMapProvider
An SiteMapProvider that is the top-level site map provider in the provider hierarchy that the current provider belongs to.

ExceptionCondition
ProviderException

There is a circular reference to the current site map provider.

All classes that implement the SiteMapProvider class can support the concept of a site map provider hierarchy. Any hierarchical relationships between providers are maintained outside the scope of a SiteMapProviderCollection collection by the providers themselves. For an example of a functional provider hierarchy, see XmlSiteMapProvider.

The following code example demonstrates how to implement the RootProvider property in a class that implements the abstract SiteMapProvider class. The SimpleTextSiteMapProvider uses simple logic to determine whether the current provider is part of a provider hierarchy. If the provider is part of a hierarchy, it uses the RootProvider property for the parent provider as its own. If the provider is not part of a hierarchy, the provider is its own root provider.

This code example is part of a larger example provided for the SiteMapProvider class.

// Implement the ParentProvider property. 
public override SiteMapProvider ParentProvider
{
  get
  {
    return parentSiteMapProvider;
  }
  set
  {
    parentSiteMapProvider = value;
  }
}

// Implement the RootProvider property. 
public override SiteMapProvider RootProvider
{
  get
  {
    // If the current instance belongs to a provider hierarchy, it 
    // cannot be the RootProvider. Rely on the ParentProvider. 
    if (this.ParentProvider != null)
    {
      return ParentProvider.RootProvider;
    }
    // If the current instance does not have a ParentProvider, it is 
    // not a child in a hierarchy, and can be the RootProvider. 
    else
    {
      return this;
    }
  }
}

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
Show: