ASP.NET 2.0 TreeView - OnSelectedNodeChanged不会在用户控件中触发 [英] ASP.NET 2.0 TreeView - OnSelectedNodeChanged does not fire in an User Control
问题描述
我有一个小的用户控件定义为：
I have a small User Control defined as:
<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="CompanyTree.ascx.cs" Inherits="RivWorks.Web.UserControls.CompanyTree" %>
<div class="PrettyTree">
<asp:TreeView runat="server"
ID="companyTree"
OnSelectedNodeChanged="SelectedNodeChanged"
OnAdaptedSelectedNodeChanged="SelectedNodeChanged" >
</asp:TreeView>
<asp:Label runat="server" ID="currentParentID" Text="" Visible="false" />
<asp:Label runat="server" ID="currentCompanyID" Text="" Visible="false" />
<asp:Label runat="server" ID="currentExpandDepth" Text="" Visible="false" />
<asp:Label runat="server" ID="currentValuePath" Text="" Visible="false" />
<asp:Label runat="server" ID="currentParentValuePath" Text="" Visible="false" />
<asp:Label runat="server" ID="currentCompanyUser" Text="" Visible="false" />
</div>
由于某些原因，当我点击树中的一个节点时，OnSelectedNodeChanged和OnAdaptedSelectedNodeChanged事件不会触发。我已经在谷歌搜索最后一个小时，没有发现任何异常。
For some reason, the OnSelectedNodeChanged and OnAdaptedSelectedNodeChanged events do not fire when I click on a node in the tree. I’ve been googling for the last hour and have not found anything amiss.
这是代码中的事件处理程序。
Here are my event handlers in the code behind.
#region Event Handlers
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
LoadCompanyTree();
TreeNode currentNode = companyTree.SelectedNode;
CompanyID = currentNode.Value;
ValuePath = currentNode.ValuePath;
if (currentNode.Parent != null)
{
ParentCompanyID = currentNode.Parent.Value;
ParentValuePath = currentNode.Parent.ValuePath;
}
else
{
ParentCompanyID = "";
ParentValuePath = "";
}
ExpandDepth = currentNode.Depth.ToString();
LoadCompany();
}
}
protected void SelectedNodeChanged(object sender, EventArgs e)
{
TreeNode currentNode = companyTree.SelectedNode;
CompanyID = currentNode.Value;
ValuePath = currentNode.ValuePath;
if (currentNode.Parent != null)
{
ParentCompanyID = currentNode.Parent.Value;
ParentValuePath = currentNode.Parent.ValuePath;
}
else
{
ParentCompanyID = "";
ParentValuePath = "";
}
ExpandDepth = currentNode.Depth.ToString();
LoadCompany();
}
#endregion
我还包括构建树的代码。我的数据结构基于 http://articles.sitepoint.com/article/hierarchical -data数据库。
I am also including the code for building the tree. My data structure is based off of http://articles.sitepoint.com/article/hierarchical-data-database.
private void LoadCompanyTree()
{
DataTable dtTree = RivWorks.Data.Companies.GetTree();
companyTree.Nodes.Clear();
companyTree.Nodes.Add(RivWorks.Web.Tree.BuildTree(dtTree, Page));
companyTree.ExpandDepth = 1;
companyTree.Nodes[0].Selected = true;
companyTree.Nodes[0].Select();
companyTree.ShowLines = true;
companyTree.RootNodeStyle.ImageUrl = Page.ResolveUrl(@"~/images/tree/root.png");
companyTree.ParentNodeStyle.ImageUrl = Page.ResolveUrl(@"~/images/tree/parent.png");
companyTree.LeafNodeStyle.ImageUrl = Page.ResolveUrl(@"~/images/tree/leaf.png");
companyTree.SelectedNodeStyle.Font.Bold = true;
companyTree.SelectedNodeStyle.Font.Italic = true;
if (CompanyID.Length > 0)
{
for (int i = 0; i < companyTree.Nodes.Count; i++)
{
if (companyTree.Nodes[i].Value.Equals(CompanyID, StringComparison.CurrentCultureIgnoreCase))
{
companyTree.ExpandDepth = companyTree.Nodes[i].Depth;
ValuePath = companyTree.Nodes[i].ValuePath;
companyTree.Nodes[i].Selected = true;
companyTree.Nodes[i].Select();
}
}
}
}
internal static TreeNode BuildTree(DataTable dtTree, System.Web.UI.Page myPage)
{
int left = 0;
int right = 0;
int index = 0;
Stack<int> rightStack = new Stack<int>();
Stack<TreeNode> treeStack = new Stack<TreeNode>();
TreeNode rootNode = new TreeNode(dtTree.Rows[index]["CompanyName"].ToString(), dtTree.Rows[index]["CompanyID"].ToString());
while (index < dtTree.Rows.Count)
{
left = Convert.ToInt32(dtTree.Rows[index]["left"]);
right = Convert.ToInt32(dtTree.Rows[index]["right"]);
if (rightStack.Count > 0)
{
while (rightStack.Peek() < right)
{
rightStack.Pop();
treeStack.Pop();
}
}
if (treeStack.Count == 0)
{
treeStack.Push(rootNode);
}
else
{
TreeNode treeNode = new TreeNode(dtTree.Rows[index]["CompanyName"].ToString(), dtTree.Rows[index]["CompanyID"].ToString());
treeStack.Peek().ChildNodes.Add(treeNode);
treeStack.Push(treeNode);
}
rightStack.Push(right);
index++;
}
return rootNode;
}
当我把它放在一个ASPX页面，它的工作正常。当我将其移动到ASCX用户控件时，事件不再触发！任何提示/建议，以使事件触发？
When I put this in an ASPX page it works fine. When I moved it to an ASCX User Control the event no longer fires! Any tips/suggestions to get the event to fire?
TIA
注意：
我正在使用在CodePlex上找到的CSS友好控制适配器。 http://cssfriendly.codeplex.com/workitem/5519?PendingVoteId=5519是用户控件（.ascx）中不提高事件的错误报告。我已经添加了建议的代码加上更多的内容，但仍然没有触发。
NOTE: I am using the CSS Friendly Control Adapters found on CodePlex. http://cssfriendly.codeplex.com/workitem/5519?PendingVoteId=5519 is a bug report of the event not raising in User Control (.ascx). I've added the suggested code plus more and it still does not fire.
<MasterPage>
<Page>
<ContentHolder>
<User Control> <-- this should handle the event!
<TreeView with CSSFriendly Adapter>
适配器中的代码：
public void RaiseAdaptedEvent(string eventName, EventArgs e)
{
string attr = "OnAdapted" + eventName;
if ((AdaptedControl != null) && (!String.IsNullOrEmpty(AdaptedControl.Attributes[attr])))
{
string delegateName = AdaptedControl.Attributes[attr];
Control methodOwner = AdaptedControl.Parent;
MethodInfo method = methodOwner.GetType().GetMethod(delegateName);
if (method == null)
{
methodOwner = AdaptedControl.Page;
method = methodOwner.GetType().GetMethod(delegateName);
}
// 2010.06.21 - keith.barrows - added to (hopefully) handle User Control (ASCX) coding...
// http://forums.asp.net/t/1249501.aspx
if (method == null)
{
Control parentUserControl = FindParentUserControl(AdaptedControl.Parent);
if (parentUserControl != null)
{
methodOwner = parentUserControl;
method = methodOwner.GetType().GetMethod(delegateName);
}
}
// 2010.06.21 - keith.barrows - added to (hopefully) handle User Control (ASCX) coding...
// http://cssfriendly.codeplex.com/workitem/5519?ProjectName=cssfriendly
if (method == null)
{
methodOwner = AdaptedControl.NamingContainer;
method = methodOwner.GetType().GetMethod(delegateName);
}
if (method == null)
{
methodOwner = AdaptedControl.Parent;
method = methodOwner.GetType().GetMethod(delegateName);
}
if (method != null)
{
object[] args = new object[2];
args[0] = AdaptedControl;
args[1] = e;
method.Invoke(methodOwner, args);
}
}
}
private Control FindParentUserControl(Control control)
{
if (control.Parent == null)
return null;
if (control.Parent is UserControl)
return control.Parent;
return FindParentUserControl(control.Parent);
}
我缺少一个委托或事件定义？自适应控件是 不能找到 调用方法！
Am I missing a delegate or event definition? The Adapted Control is JUST NOT FINDING the method to call!
推荐答案
偶然发现我找到了一个可以工作的解决方案。不要问我为什么，但我很想找出来！
Quite by accident I found a solution that does work. Don't ask me why but I am dying to find out!
在我的ASPX页面代码旁边，我添加了这种方法签名：
In my ASPX page code-beside I added this method signature:
protected void SelectedNodeChanged(object sender, EventArgs e)
{
}
现在， RaiseAdaptedEvent 事件在ASCX文件中查找事件处理程序 !!
And now the RaiseAdaptedEvent event finds the event handler in the ASCX file!!
在我标记为答案之前 - 有没有人有任何线索为什么这样会这样工作？
Before I mark this as the answer - does anyone have any clue why this would work this way?
这篇关于ASP.NET 2.0 TreeView - OnSelectedNodeChanged不会在用户控件中触发的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
