自定义TreeNode,如何取出自定义的属性？

[joy]

我自定义了一个TreeNode和Treeview.并在TreeNode里面增加了若干属性。

public class CompanyNode : System.Web.UI.WebControls.TreeNode

{
private string _nodeID;
private string _parentID;
private int _levelID;
private string _nodeName;

public CompanyNode()
: base()
{
}

public CompanyNode(string NodeText, string NodeValue, string ImageUrl)
: base(NodeText, NodeValue, ImageUrl)
{

}

public string NodeID
{
get { return this._nodeID; }
set { this._nodeID = value; }
}

public string ParentID
{
get { return this._parentID; }
set { this._parentID = value; }
}

public int LevelID
{
get { return this._levelID; }
set { this._levelID = value; }
}

public string NodeName
{
get { return this._nodeName; }
set { this._nodeName = value; }
}
}

public class CompanyTreeView : TreeView
{
protected override TreeNode CreateNode()
{
return new CompanyNode();
}

}

我用一下代码在装载Treeview:

AceWorld.Control.CompanyNode companyRoot = new AceWorld.Control.CompanyNode("CompanyName,"CompanyID, "../../images/star.gif");

companyRoot.NodeName = "TestNode";
companyRoot.NodeID= "TestNodeID";
companyRoot.ParentID= "TestParentID";
companyRoot.LevelID= 1;

treeView.Nodes.Add(companyRoot);


然后我想在Click树结点的时候，从节点里面取出装载时添加的属性"NodeName" "NodeID", "ParentID","LevelID"。

protected void CompanyTreeView_Setting_SelectedNodeChanged(object sender, EventArgs e)
{
CompanyNode tmpNode = (CompanyNode)(this.CompanyTreeView_Setting.SelectedNode);

}

但是 (CompanyNode)(this.CompanyTreeView_Setting.SelectedNode) 经过转换后返回的"tmpNode" ,所有属性比如 "NodeName" "NodeID", "ParentID","LevelID" 全都为Null.

大家知道怎么办吗？

(以上思路在Winform当中顺利通过，但是在asp.net中总是失败)

[Eddie005]

跟Winform中不同，如果你希望控件的某个属性能在回传后保持，那么你需要把它保存到ViewState里

[Eddie005]

那么，控件应该按下面给出的例子这样写：

private string ViewStateMyText
{
get
{
object local = base.ViewState["MyText"];
return (local != null) ? (String)local : "";
}
}

public string MyText
{
get
{
return ViewStateMyText;
}

set
{
base.ViewState["MyText"] = value;
}
}

[CH_MARS]

我用一下代码在装载Treeview:

AceWorld.Control.CompanyNode companyRoot = new AceWorld.Control.CompanyNode("CompanyName,"CompanyID, "../../images/star.gif");

companyRoot.NodeName = "TestNode";
companyRoot.NodeID= "TestNodeID";
companyRoot.ParentID= "TestParentID";
companyRoot.LevelID= 1;

这些封装要写到public class CompanyNode : System.Web.UI.WebControls.TreeNode类里面