如何从树节点类继承？ [英] How to inherit from the treenode class?

问题描述

我有一个类，从树节点继承，称为ExtendedTreeNode。要添加这种类型到TreeView的对象是没有问题的。但我怎么检索树形视图对象？

I have a class that inherits from TreeNode, called ExtendedTreeNode. To add an object of this type to the treeview is not a problem. But how do I retrieve the object from the treeview?

我已经试过这样：

TreeNode node = tvManual.Find("path/to/node"); // tvManual is a treeview

return ((ExtendedTreeNode)node).Property;

但是，这并不正常工作。我得到这个错误：无法转换类型'System.Web.UI.WebControls.TreeNode对象键入'PCK_Web_new.Classes.ExtendedTreeNode。

But this doesn't work. I get this error: Unable to cast object of type 'System.Web.UI.WebControls.TreeNode' to type 'PCK_Web_new.Classes.ExtendedTreeNode'.

我有什么做的，使这项工作？

What do I have to do to make this work?

------------解决方案-----------------

------------ SOLUTION -----------------

我的自定义树节点类看起来是这样的：

My custom TreeNode class looks like this:

public class ExtendedTreeNode : TreeNode
{
    private int _UniqueId;

    public int UniqueId
    {
        set { _UniqueId = value; }
        get { return _UniqueId; }
    }
    public ExtendedTreeNode()
    {
    }
}

和这样我节点添加到我的树视图：

And this way I add Nodes to my treeview:

ExtendedTreeNode TN2 = new ExtendedTreeNode();

TN2.Text = "<span class='Node'>" + doc.Title + "</span>";
TN2.Value = doc.ID.ToString();
TN2.NavigateUrl = "ViewDocument.aspx?id=" + doc.ID + "&doc=general&p=" + parent;
TN2.ImageUrl = "Graphics/algDoc.png";
TN2.ToolTip = doc.Title;
TN2.UniqueId = counter;

tvManual.FindNode(parent).ChildNodes.Add(TN2);

和这样我取回我ExtendedTreeNode对象：

And this way I retrieve my ExtendedTreeNode object:

TreeNode node = tvManual.Find("path/to/node");
ExtendedTreeNode extNode = node as ExtendedTreeNode;
return extNode.UniqueId;

我使用.NET 3.5 SP1

I am using .NET 3.5 SP1

推荐答案

您可以尝试以下方法让你的父母下的所有节点：

You could try the following to get all nodes under your parent:

TreeNode[] parentNode = treeView1.Nodes.Find (parentid, true);
foreach(TreeNode node in parentNode)
{
    ExtendedTreeNode ext_tree_node = node as ExtendedTreeNode;
    if(ext_tree_node != null)
    {
        // Do your work
    }
}

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