IHierarchyData.GetChildren Метод

Определение

Возвращает объект перечисления, представляющий все дочерние узлы текущего иерархического узла.Gets an enumeration object that represents all the child nodes of the current hierarchical node.

public:
 System::Web::UI::IHierarchicalEnumerable ^ GetChildren();
public System.Web.UI.IHierarchicalEnumerable GetChildren ();
abstract member GetChildren : unit -> System.Web.UI.IHierarchicalEnumerable
Public Function GetChildren () As IHierarchicalEnumerable

Возвраты

Коллекция IHierarchicalEnumerable дочерних узелов текущего иерархического узла.An IHierarchicalEnumerable collection of child nodes of the current hierarchical node.

Примеры

В следующем примере кода показано, как проверить HasChildren свойство, чтобы определить, имеет ли текущий узел иерархических данных дочерние узлы, и получить их GetChildren с помощью метода.The following code example demonstrates how to check the HasChildren property to determine whether the current hierarchical data node has child nodes, and retrieve them using the GetChildren method. Этот пример кода является частью большого примера, IHierarchyData предоставляемого для интерфейса.This code example is part of a larger example provided for the IHierarchyData interface.

// Print out the current data node, then iterate through its
// children and do the same.
private void PrintFullChildNodeInfo(IHierarchyData node)
{
    string whitespace = "     ";
    string br = "<BR>";

    Response.Write(node.ToString() + br);
    Response.Write(whitespace + node.Path + br);

    // Check for specific types and perform extended functions.
    if (node.Type == "SiteMapNode")
    {
        // Because SiteMapNode implements the IHierarchyData interface,
        // the IHierarchyData object can be cast directly as a SiteMapNode,
        // rather than accessing the Item property for the object that
        // the Type property identifies.
        SiteMapNode siteNode = node.Item as SiteMapNode;
        Response.Write(whitespace + siteNode.Url + br);
        Response.Write(whitespace + siteNode.Description + br);
    }
    else if (node.Type == "SomeBusinessObject")
    {
        // If the IHierarchyData instance is a wrapper class on a business
        // object of some kind, you can retrieve the business object by using
        // the IHierarchyData.Item property.
        //          SomeBusinessObject busObj = node.Item as SomeBusinessObject;
    }

    if (node.HasChildren)
    {
        IEnumerator children = ((IHierarchicalEnumerable)node.GetChildren()).GetEnumerator();

        while (children.MoveNext())
        {
            // Print out SiteMapNode Titles recursively.
            IHierarchyData hierarchicalNode = node.GetChildren().GetHierarchyData(children.Current);
            PrintFullChildNodeInfo(hierarchicalNode);
        }
    }
}
' Print out the current data node, then iterate through its
' children and do the same.

Private Sub PrintFullChildNodeInfo(ByVal node As IHierarchyData)
    Dim whitespace As String = "&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;"
    Dim br As String = "<BR>"

    Response.Write(Convert.ToString(node) & br)
    Response.Write(whitespace & node.Path & br)

    ' Check for specific types and perform extended functions.
    If node.Type = "SiteMapNode" Then
        ' Because SiteMapNode implements the IHierarchyData interface,
        ' the IHierarchyData object can be cast directly as a SiteMapNode,
        ' rather than accessing the Item property for the object that
        ' the Type property identifies.
        Dim siteNode As SiteMapNode = CType(node.Item, SiteMapNode)
        Response.Write(whitespace & siteNode.Url & br)
        Response.Write(whitespace & siteNode.Description & br)

    ElseIf node.Type = "SomeBusinessObject Then" Then
        ' If the IHierarchyData instance is a wrapper class on a business
        ' object of some kind, you can retrieve the business object by using
        ' the IHierarchyData.Item property.
        '          SomeBusinessObject busObj = node.Item as SomeBusinessObject;
    End If

    If node.HasChildren Then
        Dim children As IEnumerator = CType(node.GetChildren().GetEnumerator(), IHierarchicalEnumerable)
        While children.MoveNext()
            ' Print out SiteMapNode Titles recursively.
            Dim hierarchicalNode As IHierarchyData = node.GetChildren().GetHierarchyData(children.Current)
            PrintFullChildNodeInfo(hierarchicalNode)
        End While
    End If
End Sub

Комментарии

Можно использовать HasChildren свойство, чтобы определить, IHierarchyData имеет ли узел дочерние узлы.You can use the HasChildren property to determine whether the IHierarchyData node has child nodes.

Применяется к

Дополнительно