如何獲取UserControl調度HelpRequest事件

Question

如何在「HelpRequest-mode」中單擊時獲取UserControl調度HelpRequest事件？

我試着用一些彩色背景設置最簡單的UserControl。但不能讓它工作。

修訂

namespace SeoTools.UI.Components 
{ 
    public partial class HelpRequestTest : UserControl 
    { 
     public HelpRequestTest() 
     { 
      InitializeComponent(); 
     } 

     protected override void OnHelpRequested(HelpEventArgs hevent) 
     { 
      base.OnHelpRequested(hevent); //can't get it here either 
     } 
    } 
} 

namespace SeoTools.UI.Components 
{ 
    partial class HelpRequestTest 
    { 
     /// <summary> 
     /// Required designer variable. 
     /// </summary> 
     private System.ComponentModel.IContainer components = null; 

     /// <summary> 
     /// Clean up any resources being used. 
     /// </summary> 
     /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param> 
     protected override void Dispose(bool disposing) 
     { 
      if (disposing && (components != null)) 
      { 
       components.Dispose(); 
      } 
      base.Dispose(disposing); 
     } 

     #region Component Designer generated code 

     /// <summary> 
     /// Required method for Designer support - do not modify 
     /// the contents of this method with the code editor. 
     /// </summary> 
     private void InitializeComponent() 
     { 
      this.SuspendLayout(); 
      // 
      // HelpRequestTest 
      // 
      this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F); 
      this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; 
      this.BackColor = System.Drawing.SystemColors.ActiveCaption; 
      this.Name = "HelpRequestTest"; 
      this.Size = new System.Drawing.Size(114, 94); 
      this.ResumeLayout(false); 

     } 

     #endregion 
    } 
} 

... 

private void WebHelpRequested(object sender, HelpEventArgs hlpevent) 
{ 
    string tag = ((Control)sender).Tag.ToString(); 
    if (!string.IsNullOrEmpty(tag)) 
    { 
     try 
     { 
      ProcessStartInfo sInfo = new ProcessStartInfo(tag); 
      Process.Start(sInfo); 
     } 
     catch (Exception) { } 
    } 
    hlpevent.Handled = true; 
} 

... 

// 
// helpRequestTest1 
// 
this.helpRequestTest1.BackColor = System.Drawing.SystemColors.ActiveCaption; 
this.helpRequestTest1.Location = new System.Drawing.Point(91, 3); 
this.helpRequestTest1.Name = "helpRequestTest1"; 
this.helpRequestTest1.Size = new System.Drawing.Size(114, 94); 
this.helpRequestTest1.TabIndex = 1; 
this.helpRequestTest1.Tag = "http://offerta.se"; 
this.helpRequestTest1.HelpRequested += new System.Windows.Forms.HelpEventHandler(this.WebHelpRequested); 

Answer 1

在它最簡單的形式：

public partial class UserControl1 : UserControl { 
    public UserControl1() { 
    InitializeComponent(); 
    } 
} 

public partial class Form1 : Form { 
    public Form1() { 
    InitializeComponent(); 
    userControl11.Tag = "http://www.stackoverflow.com"; 
    userControl11.HelpRequested += userControl11_HelpRequested; 
    } 

    private void userControl11_HelpRequested(object sender, HelpEventArgs hlpevent) { 
    string tag = ((Control)sender).Tag.ToString(); 
    if (!string.IsNullOrEmpty(tag)) { 
     try { 
     ProcessStartInfo sInfo = new ProcessStartInfo(tag); 
     Process.Start(sInfo); 
     } 
     catch (Exception) { } 
    } 
    hlpevent.Handled = true; 
    } 
} 

這工作我的機器上 「原樣」。我讓它「停止」工作的唯一方法是如果我將一個TextBox控件添加到UserControl，並處理它的HelpRequest事件。

public partial class UserControl1 : UserControl { 
    public UserControl1() { 
    InitializeComponent(); 
    } 

    private void textBox1_HelpRequested(object sender, HelpEventArgs hlpevent) { 
    //This prevents the UserControl from firing it's help request: 
    } 
} 

所以我在這一點上唯一的建議是看在你的用戶控件的子控件，並查看它們是否與用戶控件的調用事件的能力干擾。