TreeNode.Depth 属性
定义
重要
一些信息与预发行产品相关,相应产品在发行之前可能会进行重大修改。 对于此处提供的信息,Microsoft 不作任何明示或暗示的担保。
获取节点的深度。
public:
property int Depth { int get(); };
[System.ComponentModel.Browsable(false)]
public int Depth { get; }
[<System.ComponentModel.Browsable(false)>]
member this.Depth : int
Public ReadOnly Property Depth As Integer
属性值
节点的深度。
- 属性
示例
下面的代码示例演示如何使用 Depth 属性来确定节点的深度。 它将深度为 1 的所有节点初始化为所选状态。 若要使此示例正常工作,必须将以下示例 XML 数据复制到名为 Newsgroup.xml 的文件。
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
void Data_Bound(Object sender, TreeNodeEventArgs e)
{
// Check the depth of a node as it is being bound to data.
// Initialize the Checked property to true if the depth is 1.
if(e.Node.Depth == 1)
{
e.Node.Checked = true;
}
else
{
e.Node.Checked = false;
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>TreeNode Checked Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>TreeNode Checked Example</h3>
<asp:TreeView id="NewsgroupTreeView"
DataSourceID="NewsgroupXmlDataSource"
OnTreeNodeDataBound="Data_Bound"
ShowCheckBoxes="All"
ExpandDepth="2"
runat="server">
<DataBindings>
<asp:TreeNodeBinding DataMember="category" TextField="Name"/>
<asp:TreeNodeBinding DataMember="group" TextField="Name"/>
</DataBindings>
</asp:TreeView>
<asp:XmlDataSource id="NewsgroupXmlDataSource"
DataFile="Newsgroup.xml"
runat="server">
</asp:XmlDataSource>
</form>
</body>
</html>
<%@ Page Language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Sub Data_Bound(ByVal sender As Object, ByVal e As TreeNodeEventArgs)
' Check the depth of a node as it is being bound to data.
' Initialize the Checked property to true if the depth is 1.
If e.Node.Depth = 1 Then
e.Node.Checked = True
Else
e.Node.Checked = False
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>TreeNode Checked Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>TreeNode Checked Example</h3>
<asp:TreeView id="NewsgroupTreeView"
DataSourceID="NewsgroupXmlDataSource"
OnTreeNodeDataBound="Data_Bound"
ShowCheckBoxes="All"
ExpandDepth="2"
runat="server">
<DataBindings>
<asp:TreeNodeBinding DataMember="category" TextField="Name"/>
<asp:TreeNodeBinding DataMember="group" TextField="Name"/>
</DataBindings>
</asp:TreeView>
<asp:XmlDataSource id="NewsgroupXmlDataSource"
DataFile="Newsgroup.xml"
runat="server">
</asp:XmlDataSource>
</form>
</body>
</html>
以下代码是上一个示例的示例 XML 数据。
<category name="news.microsoft.com">
<group name="microsoft.public.dotnet.framework.aspnet"/>
<group name="microsoft.public.dotnet.framework.aspnet.mobile"/>
<group name="microsoft.public.dotnet.framework.aspnet.webservices"/>
</category>
注解
Depth使用 属性确定节点的深度。 深度表示节点和根节点之间的层次结构级别数。 例如,根节点的深度为零。 根节点的子节点的深度为 1,依类而行。