在C#中用户控件与窗体间的消息传递

如果在C#中实现用户定义控件内的事件挂勾到调用的窗体事件中

细节如下：

1、新建应用程序WindowsApplication1。

2、添加新的用户控件UserLogin。（如图User）

3、定义用户属性

      //定义属性
  public string Username
  {
   get{return username;}
   set{username=value;}
  }
  public string Password
  {
   get{return password;}
   set{password=value;}
  }

 //定义委托
 public delegate void btnOkClickEventHander(object sender,EventArgs e);
 public delegate void btnCancelClickEventHander(object sender,EventArgs e);

  //定义事件
  public event btnOkClickEventHander btnOkClick;
  public event btnCancelClickEventHander btnCancelClick

6、事件实现

private void textBoxUid_TextChanged(object sender, System.EventArgs e)
  {
   Username=this.textBoxUid.Text;
  }

  private void textBoxPwd_TextChanged(object sender, System.EventArgs e)
  {
   Password=this.textBoxPwd.Text;
  }

  private void buttonOK_Click(object sender, System.EventArgs e)
  {
   if (btnOkClick!=null)
     btnOkClick(this,e);
  }

  private void buttonCancel_Click(object sender, System.EventArgs e)
  {
   if (btnCancelClick!=null)
    btnCancelClick(this,e);
  }

7、在FORM1的WinForm中实现对用户控件事件的调用，消息的接收。

protected void okClick(object send,System.EventArgs e)
  {
   MessageBox.Show("UID:"+userLogin1.Username+";PWD:"+userLogin1.Password,"UserMessage");
  }

  protected void CancelClick(object send,System.EventArgs e)
  {
   this.Close();
  }

8.按F5运行(如图Result)

附1（WindowsApplication1源代码）

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace WindowsApplication1
{
 /// <summary>
 /// Form1 的摘要说明。
 /// </summary>
 public class Form1 : System.Windows.Forms.Form
 {
  private System.Windows.Forms.Panel panel1;
  private WindowsApplication1.UserLogin userLogin1;
  /// <summary>
  /// 必需的设计器变量。
  /// </summary>
  private System.ComponentModel.Container components = null;

  public Form1()
  {
   //
   // Windows 窗体设计器支持所必需的
   //
   InitializeComponent();
   userLogin1.btnOkClick+=new btnOkClickEventHander(okClick);
   userLogin1.btnCancelClick+=new btnCancelClickEventHander(CancelClick);
   //
   // TODO: 在 InitializeComponent 调用后添加任何构造函数代码
   //
  }

  /// <summary>
  /// 清理所有正在使用的资源。
  /// </summary>
  protected override void Dispose( bool disposing )
  {
   if( disposing )
   {
    if (components != null)
    {
     components.Dispose();
    }
   }
   base.Dispose( disposing );
  }

  #region Windows 窗体设计器生成的代码
  /// <summary>
  /// 设计器支持所需的方法 - 不要使用代码编辑器修改
  /// 此方法的内容。
  /// </summary>
  private void InitializeComponent()
  {
   this.panel1 = new System.Windows.Forms.Panel();
   this.userLogin1 = new WindowsApplication1.UserLogin();
   this.panel1.SuspendLayout();
   this.SuspendLayout();
   //
   // panel1
   //
   this.panel1.Controls.Add(this.userLogin1);
   this.panel1.Dock = System.Windows.Forms.DockStyle.Fill;
   this.panel1.Location = new System.Drawing.Point(0, 0);
   this.panel1.Name = "panel1";
   this.panel1.Size = new System.Drawing.Size(216, 101);
   this.panel1.TabIndex = 1;
   //
   // userLogin1
   //
   this.userLogin1.Dock = System.Windows.Forms.DockStyle.Fill;
   this.userLogin1.Location = new System.Drawing.Point(0, 0);
   this.userLogin1.Name = "userLogin1";
   this.userLogin1.Size = new System.Drawing.Size(216, 101);
   this.userLogin1.TabIndex = 0;
   //
   // Form1
   //
   this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
   this.ClientSize = new System.Drawing.Size(216, 101);
   this.Controls.Add(this.panel1);
   this.Name = "Form1";
   this.Text = "Form1";
   this.panel1.ResumeLayout(false);
   this.ResumeLayout(false);

  }
  #endregion

  /// <summary>
  /// 应用程序的主入口点。
  /// </summary>
  [STAThread]
  static void Main()
  {
   Application.Run(new Form1());
  }
  protected void okClick(object send,System.EventArgs e)
  {
   MessageBox.Show("UID:"+userLogin1.Username+";PWD:"+userLogin1.Password,"UserMessage");
  }

  protected void CancelClick(object send,System.EventArgs e)
  {
   this.Close();
  }

 }
}

 附2（UserLogin源代码）

using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Windows.Forms;

namespace WindowsApplication1
{
 /// <summary>
 /// UserControl1 的摘要说明。
 /// </summary>
 /// //定义委托
 public delegate void btnOkClickEventHander(object sender,EventArgs e);
 public delegate void btnCancelClickEventHander(object sender,EventArgs e);
 public class UserLogin : System.Windows.Forms.UserControl
 {
  private string username,password;
  private System.Windows.Forms.GroupBox groupBox1;
  private System.Windows.Forms.Button buttonCancel;
  private System.Windows.Forms.Button buttonOK;
  private System.Windows.Forms.TextBox textBoxPwd;
  private System.Windows.Forms.Label label2;
  private System.Windows.Forms.Label label1;
  private System.Windows.Forms.TextBox textBoxUid;
  /// <summary>
  /// 必需的设计器变量。
  /// </summary>
  private System.ComponentModel.Container components = null;

  public UserLogin()
  {
   // 该调用是 Windows.Forms 窗体设计器所必需的。
   InitializeComponent();

   // TODO: 在 InitializeComponent 调用后添加任何初始化

  }

  /// <summary>
  /// 清理所有正在使用的资源。
  /// </summary>
  protected override void Dispose( bool disposing )
  {
   if( disposing )
   {
    if(components != null)
    {
     components.Dispose();
    }
   }
   base.Dispose( disposing );
  }

  #region 组件设计器生成的代码
  /// <summary>
  /// 设计器支持所需的方法 - 不要使用代码编辑器
  /// 修改此方法的内容。
  /// </summary>
  private void InitializeComponent()
  {
   this.groupBox1 = new System.Windows.Forms.GroupBox();
   this.buttonCancel = new System.Windows.Forms.Button();
   this.buttonOK = new System.Windows.Forms.Button();
   this.textBoxPwd = new System.Windows.Forms.TextBox();
   this.label2 = new System.Windows.Forms.Label();
   this.label1 = new System.Windows.Forms.Label();
   this.textBoxUid = new System.Windows.Forms.TextBox();
   this.groupBox1.SuspendLayout();
   this.SuspendLayout();
   //
   // groupBox1
   //
   this.groupBox1.Controls.Add(this.buttonCancel);
   this.groupBox1.Controls.Add(this.buttonOK);
   this.groupBox1.Controls.Add(this.textBoxPwd);
   this.groupBox1.Controls.Add(this.label2);
   this.groupBox1.Controls.Add(this.label1);
   this.groupBox1.Controls.Add(this.textBoxUid);
   this.groupBox1.Location = new System.Drawing.Point(8, 2);
   this.groupBox1.Name = "groupBox1";
   this.groupBox1.Size = new System.Drawing.Size(200, 96);
   this.groupBox1.TabIndex = 6;
   this.groupBox1.TabStop = false;
   //
   // buttonCancel
   //
   this.buttonCancel.Location = new System.Drawing.Point(112, 71);
   this.buttonCancel.Name = "buttonCancel";
   this.buttonCancel.Size = new System.Drawing.Size(56, 20);
   this.buttonCancel.TabIndex = 11;
   this.buttonCancel.Text = "&Cancel";
   this.buttonCancel.Click += new System.EventHandler(this.buttonCancel_Click);
   //
   // buttonOK
   //
   this.buttonOK.Location = new System.Drawing.Point(32, 71);
   this.buttonOK.Name = "buttonOK";
   this.buttonOK.Size = new System.Drawing.Size(56, 20);
   this.buttonOK.TabIndex = 10;
   this.buttonOK.Text = "&OK";
   this.buttonOK.Click += new System.EventHandler(this.buttonOK_Click);
   //
   // textBoxPwd
   //
   this.textBoxPwd.Location = new System.Drawing.Point(72, 43);
   this.textBoxPwd.Name = "textBoxPwd";
   this.textBoxPwd.PasswordChar = '*';
   this.textBoxPwd.Size = new System.Drawing.Size(112, 21);
   this.textBoxPwd.TabIndex = 9;
   this.textBoxPwd.Text = "";
   this.textBoxPwd.TextChanged += new System.EventHandler(this.textBoxPwd_TextChanged);
   //
   // label2
   //
   this.label2.Location = new System.Drawing.Point(9, 42);
   this.label2.Name = "label2";
   this.label2.Size = new System.Drawing.Size(64, 23);
   this.label2.TabIndex = 8;
   this.label2.Text = "Password:";
   this.label2.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
   //
   // label1
   //
   this.label1.Location = new System.Drawing.Point(9, 14);
   this.label1.Name = "label1";
   this.label1.Size = new System.Drawing.Size(64, 23);
   this.label1.TabIndex = 7;
   this.label1.Text = "UserName:";
   this.label1.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
   //
   // textBoxUid
   //
   this.textBoxUid.Location = new System.Drawing.Point(72, 15);
   this.textBoxUid.Name = "textBoxUid";
   this.textBoxUid.Size = new System.Drawing.Size(112, 21);
   this.textBoxUid.TabIndex = 6;
   this.textBoxUid.Text = "";
   this.textBoxUid.TextChanged += new System.EventHandler(this.textBoxUid_TextChanged);
   //
   // UserLogin
   //
   this.Controls.Add(this.groupBox1);
   this.Name = "UserLogin";
   this.Size = new System.Drawing.Size(216, 104);
   this.groupBox1.ResumeLayout(false);
   this.ResumeLayout(false);

  }
  #endregion
  //定义属性
  public string Username
  {
   get{return username;}
   set{username=value;}
  }
  public string Password
  {
   get{return password;}
   set{password=value;}
  }
  
  //定义事件
  public event btnOkClickEventHander btnOkClick;
  public event btnCancelClickEventHander btnCancelClick;
  private void textBoxUid_TextChanged(object sender, System.EventArgs e)
  {
   Username=this.textBoxUid.Text;
  }

  private void textBoxPwd_TextChanged(object sender, System.EventArgs e)
  {
   Password=this.textBoxPwd.Text;
  }

  private void buttonOK_Click(object sender, System.EventArgs e)
  {
   if (btnOkClick!=null)
     btnOkClick(this,e);
  }

  private void buttonCancel_Click(object sender, System.EventArgs e)
  {
   if (btnCancelClick!=null)
    btnCancelClick(this,e);
  }
  
 }
}