IHierarchyData.GetChildren 方法

定义

命名空间:

System.Web.UI

程序集:

System.Web.dll

获取一个枚举对象，该对象表示当前分层节点的所有子节点。

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

返回

IHierarchicalEnumerable

当前分层节点的子节点的 IHierarchicalEnumerable 集合。

示例

下面的代码示例演示如何检查 HasChildren 属性以确定当前分层数据节点是否具有子节点，并使用该方法检索它们 GetChildren 。 此代码示例是为接口提供的大型示例的 IHierarchyData 一部分。

// 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 = "     "
    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

注解

可以使用该 HasChildren 属性来确定节点是否 IHierarchyData 具有子节点。

另请参阅

• HasChildren