SiteMapProvider.ParentProvider 屬性

定義

命名空間:

System.Web

組件:

System.Web.dll

取得或設定目前提供者的父代 SiteMapProvider 物件。

public:
 virtual property System::Web::SiteMapProvider ^ ParentProvider { System::Web::SiteMapProvider ^ get(); void set(System::Web::SiteMapProvider ^ value); };

public virtual System.Web.SiteMapProvider ParentProvider { get; set; }

member this.ParentProvider : System.Web.SiteMapProvider with get, set

Public Overridable Property ParentProvider As SiteMapProvider

屬性值

SiteMapProvider

目前 SiteMapProvider 的父提供者。

範例

下列程式碼範例示範如何在 ParentProvider 實作抽象 SiteMapProvider 類的類別中實作 屬性。

此程式碼範例是提供給 類別之較大範例的 SiteMapProvider 一部分。

// 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;
    }
  }
}

' Implement the ParentProvider property.
Public Overrides Property ParentProvider() As SiteMapProvider
  Get
    Return parentSiteMapProvider
  End Get
  Set(ByVal value As SiteMapProvider)
    parentSiteMapProvider = Value
  End Set
End Property

' Implement the RootProvider property.
Public Overrides ReadOnly Property RootProvider() As SiteMapProvider
  Get
    ' If the current instance belongs to a provider hierarchy, it
    ' cannot be the RootProvider. Rely on the ParentProvider.
    If Not (Me.ParentProvider Is Nothing) Then
      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 Me
    End If
  End Get
End Property

備註

所有實作抽象 SiteMapProvider 類的類別都可以支援網站地圖提供者階層的概念。 提供者之間的任何階層式關聯性，都是在提供者本身的集合範圍內 SiteMapProviderCollection 維護。 如需功能提供者階層的範例，請參閱 XmlSiteMapProvider 。

另請參閱

• RootProvider