Treeview在C＃中不工作asp.net

我试图从我的根目录中的一个文件夹（称为文件夹）构建文件和文件夹的树视图。Treeview在C＃中不工作asp.net

我的C＃代码：

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Web; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
using System.IO; 

public class Default2: Seisan.DefaultTemplate 
{ 
protected void Page_Load(object sender, EventArgs e){ 
    if (!this.IsPostBack){ 
     DirectoryInfo rootInfo = new DirectoryInfo(Server.MapPath("~/Folders/")); 
     this.PopulateTreeView(rootInfo, null); 
    } 
} 

private void PopulateTreeView(DirectoryInfo dirInfo, TreeNode treeNode) 
{ 
foreach (DirectoryInfo directory in dirInfo.GetDirectories()) 
{ 
    TreeNode directoryNode = new TreeNode(directory.Name, directory.FullName); 

    if (treeNode == null) 
    { 
     TreeView.Nodes.Add(directoryNode); 
    } 
    else 
    { 
     treeNode.ChildNodes.Add(directoryNode); 
    } 

    //Get all files in the Directory. 
    foreach (FileInfo file in directory.GetFiles()) 
    { 
     TreeNode fileNode = new TreeNode(file.Name, file.FullName, "_blank", (new Uri(Server.MapPath("~/"))).MakeRelativeUri(new Uri(file.FullName)).ToString()); 
     directoryNode.ChildNodes.Add(fileNode); 
    } 

    PopulateTreeView(directory, directoryNode); 
    } 
}

和我的树视图asp.Net代码：

<asp:TreeView ID="TreeView" runat="server" ImageSet="XPFileExplorer" NodeIndent="15"> 
    <HoverNodeStyle Font-Underline="True" ForeColor="#6666AA" /> 
     <NodeStyle Font-Names="Tahoma" Font-Size="8pt" ForeColor="Black" HorizontalPadding="2px" NodeSpacing="0px" VerticalPadding="2px"></NodeStyle> 
       <ParentNodeStyle Font-Bold="False" /> 
     <SelectedNodeStyle BackColor="#B5B5B5" Font-Underline="False" HorizontalPadding="0px" 
        VerticalPadding="0px" /> 
</asp:TreeView>

运行时，我得到这个错误：

Compilation Error

Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: CS0120: An object reference is required for the non-static field, method, or property 'System.Web.UI.WebControls.TreeView.Nodes.get'

Source Error:

Line 43: {

Line 44: TreeView.Nodes.Add(directoryNode);

Line 45: }

Line 46: else

虽然Treeview是在asp.Net窗体中声明的。我不知道这里有什么问题。任何帮助是极大的赞赏。由于

来源

2016-06-08 El Dj

您需要创建一个根节点并开始向其添加节点。 44行没有任何意义。 – Vlad

第44行应将根节点添加到TreeView。然后出现子节点的else语句。 –

您的代码中的TreeView是类的名称，而不是您的TreeView实例的名称。不好的选择来命名你的treeview控件。叫它MyTreeView什么的。 – Vlad