TreeView.PathSeparator Property
Definition
Important
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Gets or sets the character that is used to delimit the node values that are specified by the ValuePath property.
public:
property char PathSeparator { char get(); void set(char value); };public char PathSeparator { get; set; }member this.PathSeparator : char with get, setPublic Property PathSeparator As CharProperty Value
The character used to delimit the node values specified in the ValuePath property. The default is a slash mark (/).
Examples
The following code example demonstrates how to use the PathSeparator property to specify the delimiter character for the ValuePath property of a node. This value is then used to parse the ValuePath property for the individual values.
<%@ 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 Index_Changed(Object sender, EventArgs e)
{
// Set the PathSeparator character based on the user's selection.
// Notice that the value must be converted to a Char data type.
BookTreeView.PathSeparator = Convert.ToChar(List.SelectedItem.Text);
// Display the ValuePath values for the second-level nodes.
Message.Text = "The ValuePath values for the second-level nodes are:<br />";
foreach(TreeNode node in BookTreeView.Nodes[0].ChildNodes)
{
// Create the delimiter array with the PathSeparator value for the Split method.
Char[] DelimiterArray = new Char[1];
DelimiterArray[0] = BookTreeView.PathSeparator;
// Parse the ValuePath value using the delimiter array.
String[] NodeValues = node.ValuePath.Split(DelimiterArray);
// Display the node values.
for(int i=0; i<NodeValues.Length; i++)
{
if(i != NodeValues.Length - 1)
{
// Append the delimiter character.
Message.Text += NodeValues[i] + BookTreeView.PathSeparator.ToString();
}
else
{
// Do not append the delimiter character.
Message.Text += NodeValues[i];
}
}
// Append a line break for the next node.
Message.Text += "<br />";
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>TreeView PathSeparator Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>TreeView PathSeparator Example</h3>
<asp:TreeView id="BookTreeView"
ExpandDepth="-1"
PathSeparator="/"
runat="server">
<Nodes>
<asp:TreeNode Value="Chapter 1"
Text="Chapter 1">
<asp:TreeNode Value="Section 1"
Text="Section 1">
<asp:TreeNode Value="Paragraph 1"
Text="Paragraph 1">
</asp:TreeNode>
</asp:TreeNode>
<asp:TreeNode Value="Section 2"
Text="Section 2">
</asp:TreeNode>
</asp:TreeNode>
</Nodes>
</asp:TreeView>
<br />
<asp:Label id="Message" runat="server"/>
<hr />
Select a path separator value:<br />
<asp:DropDownList ID="List"
AutoPostBack="true"
OnSelectedIndexChanged="Index_Changed"
runat="server">
<asp:ListItem Selected="true">/</asp:ListItem>
<asp:ListItem>\</asp:ListItem>
<asp:ListItem>|</asp:ListItem>
<asp:ListItem>,</asp:ListItem>
<asp:ListItem>;</asp:ListItem>
</asp:DropDownList>
</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 Index_Changed(ByVal sender As Object, ByVal e As EventArgs)
' Set the PathSeparator character based on the user's selection.
' Notice that the value must be converted to a Char data type.
BookTreeView.PathSeparator = Convert.ToChar(List.SelectedItem.Text)
' Display the ValuePath values for the second-level nodes.
Message.Text = "The ValuePath values for the second-level nodes are:<br />"
Dim node As TreeNode
For Each node In BookTreeView.Nodes(0).ChildNodes
' Create the delimiter array with the PathSeparator value for the Split method.
Dim DelimiterArray(1) As Char
DelimiterArray(0) = BookTreeView.PathSeparator
' Parse the ValuePath value using the delimiter array.
Dim NodeValues() As String = node.ValuePath.Split(DelimiterArray)
' Display the node values.
Dim i As Integer
For i = 0 To NodeValues.Length - 1
If i <> NodeValues.Length - 1 Then
' Append the delimiter character.
Message.Text &= NodeValues(i) & BookTreeView.PathSeparator.ToString()
Else
' Do not append the delimiter character.
Message.Text &= NodeValues(i)
End If
Next
' Append a line break for the next node.
Message.Text &= "<br />"
Next
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>TreeView PathSeparator Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>TreeView PathSeparator Example</h3>
<asp:TreeView id="BookTreeView"
ExpandDepth="-1"
PathSeparator="/"
runat="server">
<Nodes>
<asp:TreeNode Value="Chapter 1"
Text="Chapter 1">
<asp:TreeNode Value="Section 1"
Text="Section 1">
<asp:TreeNode Value="Paragraph 1"
Text="Paragraph 1">
</asp:TreeNode>
</asp:TreeNode>
<asp:TreeNode Value="Section 2"
Text="Section 2">
</asp:TreeNode>
</asp:TreeNode>
</Nodes>
</asp:TreeView>
<br />
<asp:Label id="Message" runat="server"/>
<hr />
Select a path separator value:<br />
<asp:DropDownList ID="List"
AutoPostBack="true"
OnSelectedIndexChanged="Index_Changed"
runat="server">
<asp:ListItem Selected="true">/</asp:ListItem>
<asp:ListItem>\</asp:ListItem>
<asp:ListItem>|</asp:ListItem>
<asp:ListItem>,</asp:ListItem>
<asp:ListItem>;</asp:ListItem>
</asp:DropDownList>
</form>
</body>
</html>
Remarks
The ValuePath property contains a delimiter-separated list of node values that form a path from the root node to the current node. Use the PathSeparator property to specify the delimiter character that is used to separate the node values. This value is commonly used when parsing the list for the individual values.
Depending on the text that is displayed in the TreeView control, the delimiter character might need to be changed to prevent any conflicts. For example, if you set the delimiter character to a comma, the displayed text should not contain any commas; otherwise, the ValuePath property cannot be parsed accurately.
The value of this property is stored in view state.
