TreeView.FindNode(String) 方法
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。
public:
System::Web::UI::WebControls::TreeNode ^ FindNode(System::String ^ valuePath);public System.Web.UI.WebControls.TreeNode FindNode (string valuePath);member this.FindNode : string -> System.Web.UI.WebControls.TreeNodePublic Function FindNode (valuePath As String) As TreeNode参数
- valuePath
- String
节点的值路径。
返回
指定值路径处的 TreeNode。
示例
下面的代码示例演示如何使用 FindNode 方法从 TreeView 控件中检索节点。
重要
此示例具有一个接受用户输入的文本框，这是一个潜在的安全威胁。 默认情况下，ASP.NET 网页验证用户输入是否不包含脚本或 HTML 元素。 有关详细信息，请参阅脚本侵入概述。
<%@ 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 Button_Click(Object sender, EventArgs e)
{
// Find the node specified by the user.
TreeNode node = LinksTreeView.FindNode(Server.HtmlEncode(ValuePathText.Text));
if (node != null)
{
// Indicate that the node was found.
Message.Text = "The specified node (" + node.ValuePath + ") was found.";
}
else
{
// Indicate that the node is not in the TreeView control.
Message.Text = "The specified node (" + ValuePathText.Text + ") is not in this TreeView control.";
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>TreeView FindNode Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>TreeView FindNode Example</h3>
<asp:TreeView id="LinksTreeView"
PathSeparator="/"
Font-Names= "Arial"
ForeColor="Blue"
runat="server">
<LevelStyles>
<asp:TreeNodeStyle ChildNodesPadding="10"
Font-Bold="true"
Font-Size="12pt"
ForeColor="DarkGreen"/>
<asp:TreeNodeStyle ChildNodesPadding="5"
Font-Bold="true"
Font-Size="10pt"/>
<asp:TreeNodeStyle ChildNodesPadding="5"
Font-UnderLine="true"
Font-Size="10pt"/>
<asp:TreeNodeStyle ChildNodesPadding="10"
Font-Size="8pt"/>
</LevelStyles>
<Nodes>
<asp:TreeNode Text="Table of Contents"
SelectAction="None">
<asp:TreeNode Text="Chapter One" Value="Chapter One">
<asp:TreeNode Text="Section 1.0" Value="Section 1.0">
<asp:TreeNode Text="Topic 1.0.1" Value="Topic 1.0.1"/>
<asp:TreeNode Text="Topic 1.0.2" Value="Topic 1.0.2"/>
<asp:TreeNode Text="Topic 1.0.3" Value="Topic 1.0.3"/>
</asp:TreeNode>
<asp:TreeNode Text="Section 1.1">
<asp:TreeNode Text="Topic 1.1.1" Value="Topic 1.1.1"/>
<asp:TreeNode Text="Topic 1.1.2" Value="Topic 1.1.2"/>
<asp:TreeNode Text="Topic 1.1.3" Value="Topic 1.1.3"/>
<asp:TreeNode Text="Topic 1.1.4" Value="Topic 1.1.4"/>
</asp:TreeNode>
</asp:TreeNode>
<asp:TreeNode Text="Chapter Two" Value="Chapter Two">
<asp:TreeNode Text="Section 2.0" Value="Section 2.0">
<asp:TreeNode Text="Topic 2.0.1" Value="Topic 2.0.1"/>
<asp:TreeNode Text="Topic 2.0.2" Value="Topic 2.0.2"/>
</asp:TreeNode>
</asp:TreeNode>
</asp:TreeNode>
<asp:TreeNode Text="Appendix A" />
<asp:TreeNode Text="Appendix B" />
<asp:TreeNode Text="Appendix C" />
</Nodes>
</asp:TreeView>
<hr/>
<br/><br/>
Enter the value path of the node to locate. <br/>
Use a forward slash (/) to delimit each node value.<br/>
<asp:TextBox id="ValuePathText"
Text="Table of Contents/Chapter One/Section 1.0"
Width="50%"
runat="server"/>
<br/><br/>
<asp:Button id="Submit"
Text="Find Node"
OnClick="Button_Click"
runat="server"/>
<br/><br/>
<asp:Label id="Message" runat="server"/>
</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 Button_Click(ByVal sender As Object, ByVal e As EventArgs)
' Find the node specified by the user.
Dim node As TreeNode = LinksTreeView.FindNode(Server.HtmlEncode(ValuePathText.Text))
If Not node Is Nothing Then
' Indicate that the node was found.
Message.Text = "The specified node (" & node.ValuePath & ") was found."
Else
' Indicate that the node is not in the TreeView control.
Message.Text = "The specified node (" & ValuePathText.Text & ") is not in this TreeView control."
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>TreeView FindNode Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>TreeView FindNode Example</h3>
<asp:TreeView id="LinksTreeView"
PathSeparator="/"
Font-Names= "Arial"
ForeColor="Blue"
runat="server">
<LevelStyles>
<asp:TreeNodeStyle ChildNodesPadding="10"
Font-Bold="true"
Font-Size="12pt"
ForeColor="DarkGreen"/>
<asp:TreeNodeStyle ChildNodesPadding="5"
Font-Bold="true"
Font-Size="10pt"/>
<asp:TreeNodeStyle ChildNodesPadding="5"
Font-UnderLine="true"
Font-Size="10pt"/>
<asp:TreeNodeStyle ChildNodesPadding="10"
Font-Size="8pt"/>
</LevelStyles>
<Nodes>
<asp:TreeNode Text="Table of Contents"
SelectAction="None">
<asp:TreeNode Text="Chapter One" Value="Chapter One">
<asp:TreeNode Text="Section 1.0" Value="Section 1.0">
<asp:TreeNode Text="Topic 1.0.1" Value="Topic 1.0.1"/>
<asp:TreeNode Text="Topic 1.0.2" Value="Topic 1.0.2"/>
<asp:TreeNode Text="Topic 1.0.3" Value="Topic 1.0.3"/>
</asp:TreeNode>
<asp:TreeNode Text="Section 1.1">
<asp:TreeNode Text="Topic 1.1.1" Value="Topic 1.1.1"/>
<asp:TreeNode Text="Topic 1.1.2" Value="Topic 1.1.2"/>
<asp:TreeNode Text="Topic 1.1.3" Value="Topic 1.1.3"/>
<asp:TreeNode Text="Topic 1.1.4" Value="Topic 1.1.4"/>
</asp:TreeNode>
</asp:TreeNode>
<asp:TreeNode Text="Chapter Two" Value="Chapter Two">
<asp:TreeNode Text="Section 2.0" Value="Section 2.0">
<asp:TreeNode Text="Topic 2.0.1" Value="Topic 2.0.1"/>
<asp:TreeNode Text="Topic 2.0.2" Value="Topic 2.0.2"/>
</asp:TreeNode>
</asp:TreeNode>
</asp:TreeNode>
<asp:TreeNode Text="Appendix A" />
<asp:TreeNode Text="Appendix B" />
<asp:TreeNode Text="Appendix C" />
</Nodes>
</asp:TreeView>
<hr/>
<br/><br/>
Enter the value path of the node to locate. <br/>
Use a forward slash (/) to delimit each node value.<br/>
<asp:TextBox id="ValuePathText"
Text="Table of Contents/Chapter One/Section 1.0"
Width="50%"
runat="server"/>
<br/><br/>
<asp:Button id="Submit"
Text="Find Node"
OnClick="Button_Click"
runat="server"/>
<br/><br/>
<asp:Label id="Message" runat="server"/>
</form>
</body>
</html>
注解
FindNode使用 方法从指定值路径处的 TreeView 控件获取节点。 值路径包含以分隔符分隔的节点值列表，这些节点值构成从根节点到当前节点的路径。 每个节点将其值路径存储在 属性中 ValuePath 。 属性 PathSeparator 指定用于分隔节点值的分隔符字符。
