Question

我有以下控件，它只有一个TreeView和ToolStrip：

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的实例，我尝试在那里添加Click事件：

    private void mtv_Click(object sender, EventArgs e)
    {
        MessageBox.Show(mtv.NodeName.ToString());
    }

AfterSelect事件触发，nodeName包含预期值，但Click不会触发。

最终，当TreeView选项发生变化时，我将加载一个文件并在文本框中显示其内容，但我无法弄清楚如何“通知”自定义控件上发生选择更改的表单。 / p>

Answer 1

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);
        }
    }    
}

现在以您的形式

public Form1()
{
    InitializeComponent();
    myTreeView1.OnValueSelected += ValueSelected;
}
private void ValueSelected(object sender, EventArgs e, string value)
{
    MessageBox.Show(value);
}

Answer 2

你可以试试这个。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);
            }
        }
    }

现在在MytreeView控件的Select Event之后的win form subscirbe中。

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
        }
    }

自定义控件上的Click事件未触发（从包含表单分配的事件）

2 个答案: