TreeView.ShowLines Property

Reference

Definition

Namespace:: System.Web.UI.WebControls

Assembly:: System.Web.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Gets or sets a value indicating whether lines connecting child nodes to parent nodes are displayed.

public:
 property bool ShowLines { bool get(); void set(bool value); };

public bool ShowLines { get; set; }

member this.ShowLines : bool with get, set

Public Property ShowLines As Boolean

Property Value

Boolean

true to display lines connecting nodes; otherwise, false. The default is false.

Examples

The following code example demonstrates how to use the ShowLines property to display lines connecting nodes in the TreeView control. Be sure to use the Line Designer tool to create a set of line images and place them in a folder named LineImages within the directory for the sample application.


<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>TreeView LineImagesFolderUrl Example</title>
</head>
<body>
    <form id="form1" runat="server">
    
      <h3>TreeView LineImagesFolderUrl Example</h3>
      
      <asp:TreeView id="LinksTreeView"
        LineImagesFolder="~\LineImages"
        ShowLines="true" 
        runat="server">
         
        <Nodes>
        
          <asp:TreeNode Text="Table of Contents"
             SelectAction="None">
             
            <asp:TreeNode Text="Chapter One">
            
              <asp:TreeNode Text="Section 1.0">
              
                <asp:TreeNode Text="Topic 1.0.1"/>
                <asp:TreeNode Text="Topic 1.0.2"/>
                <asp:TreeNode Text="Topic 1.0.3"/>
              
              </asp:TreeNode>
              
              <asp:TreeNode Text="Section 1.1">
              
                <asp:TreeNode Text="Topic 1.1.1"/>
                <asp:TreeNode Text="Topic 1.1.2"/>
                <asp:TreeNode Text="Topic 1.1.3"/>
                <asp:TreeNode Text="Topic 1.1.4"/>
              
              </asp:TreeNode>
            
            </asp:TreeNode>
            
            <asp:TreeNode Text="Chapter Two">
            
              <asp:TreeNode Text="Section 2.0">
              
                <asp:TreeNode Text="Topic 2.0.1"/>
                <asp:TreeNode Text="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>

    </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">
<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>TreeView LineImagesFolderUrl Example</title>
</head>
<body>
    <form id="form1" runat="server">
    
      <h3>TreeView LineImagesFolderUrl Example</h3>
      
      <asp:TreeView id="LinksTreeView"
        LineImagesFolder="~\LineImages"
        ShowLines="true" 
        runat="server">
         
        <Nodes>
        
          <asp:TreeNode Text="Table of Contents"
             SelectAction="None">
             
            <asp:TreeNode Text="Chapter One">
            
              <asp:TreeNode Text="Section 1.0">
              
                <asp:TreeNode Text="Topic 1.0.1"/>
                <asp:TreeNode Text="Topic 1.0.2"/>
                <asp:TreeNode Text="Topic 1.0.3"/>
              
              </asp:TreeNode>
              
              <asp:TreeNode Text="Section 1.1">
              
                <asp:TreeNode Text="Topic 1.1.1"/>
                <asp:TreeNode Text="Topic 1.1.2"/>
                <asp:TreeNode Text="Topic 1.1.3"/>
                <asp:TreeNode Text="Topic 1.1.4"/>
              
              </asp:TreeNode>
            
            </asp:TreeNode>
            
            <asp:TreeNode Text="Chapter Two">
            
              <asp:TreeNode Text="Section 2.0">
              
                <asp:TreeNode Text="Topic 2.0.1"/>
                <asp:TreeNode Text="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>

    </form>
  </body>
</html>

Remarks

Use the ShowLines property to specify whether the lines that are connecting child nodes to parent nodes are displayed. When this property is set to true, the TreeView control searches the Web-accessible folder that is specified by the LineImagesFolder property for the line images.

Note

If the LineImagesFolder property is not set, the TreeView control will use the built-in, default images (20 x 20 pixels).

The value of this property is stored in view state.

Applies to

共用方式為