C# 单击自定义控件上的事件isn';t触发(从包含窗体分配的事件)
我有以下控件,其中只包含一个TreeView和ToolStrip:C# 单击自定义控件上的事件isn';t触发(从包含窗体分配的事件),c#,.net,winforms,treeview,C#,.net,Winforms,Treeview,我有以下控件,其中只包含一个TreeView和ToolStrip: public partial class MyTreeView : UserControl { private string _nodeName; public string NodeName { get { return _nodeName;} } public MyTreeView() { InitializeComponent(); } private v
public partial class MyTreeView : UserControl
{
private string _nodeName;
public string NodeName { get { return _nodeName;} }
public MyTreeView()
{
InitializeComponent();
}
private void trv_AfterSelect(object sender, TreeViewEventArgs e)
{
if (e.Node == null || e.Node.Parent == null || e.Node.Parent.Parent == null)
return;
nodeName = e.Node.Parent.Parent.Text + @"\" + e.Node.Parent.Text + @"\" + e.Node.Text;
}
}
然后,在我的主窗体中(其中包含MyTreeView
的一个实例),我尝试在其中添加一个单击事件:
private void mtv_Click(object sender, EventArgs e)
{
MessageBox.Show(mtv.NodeName.ToString());
}
AfterSelect
事件触发,并且nodeName
包含预期值,但是单击
不会触发
最后,当TreeView选择更改时,我将加载一个文件并在文本框中显示其内容,但我不知道如何“通知”自定义控件上发生选择更改的表单。您可以尝试此方法。
像这样重写你的控件
public partial class MyTreeView : UserControl
{
//create a custom event
[Browsable(true)]
public event TreeViewEventHandler AfterSelect;
public MyTreeView()
{
InitializeComponent();
}
private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)
{
if (AfterSelect != null) {
//raise the event , as it is subscribed may be in winform
AfterSelect.Invoke(sender, e);
}
}
}
在MytreeView控件的Select事件之后,现在处于win form subscirbe状态
public Form2()
{
InitializeComponent();
//subscribe myTreeView1.AfterSelect event
myTreeView1.AfterSelect += new TreeViewEventHandler(myTreeView1_AfterSelect);
}
private void myTreeView1_AfterSelect(object sender, TreeViewEventArgs e)
{
//cast sender into TreeView
TreeView tree = sender as TreeView;
if (tree != null) {
//do your logic here
}
}
试试这个
public partial class MyTreeView : UserControl
{
public delegate void ValueSelectedHandler(object sender, EventArgs e, string value);
public event ValueSelectedHandler OnValueSelected;
private string _nodeName;
public string NodeName { get { return _nodeName;} }
public MyTreeView()
{
InitializeComponent();
}
private void trv_AfterSelect(object sender, TreeViewEventArgs e)
{
if (e.Node == null || e.Node.Parent == null || e.Node.Parent.Parent == null)
return;
nodeName = e.Node.Parent.Parent.Text + @"\" + e.Node.Parent.Text + @"\" + e.Node.Text;
if(OnValueSelected!=null)
{
OnValueSelected(sender, e, nodeName);
}
}
}
现在以你的形式
public Form1()
{
InitializeComponent();
myTreeView1.OnValueSelected += ValueSelected;
}
private void ValueSelected(object sender, EventArgs e, string value)
{
MessageBox.Show(value);
}
是否要在AfterSelect事件中获取自定义控件中正在更新的
nodeName
值?@M.NasserJavaid是的,我想在用户选择节点时在MyTreeView
中设置一个值。然后我希望表单执行string[]lines=File.ReadAllLines(myTreeView.NodeName)代码>但我似乎还是不知道如何知道何时访问表单端的值。非常感谢!由于找出了拼写错误,您的private void ValueSelected
@sab669中出现了EventArg
而不是EventArgs
的小打字错误。