在C#中用户控件与窗体间的消息传递

我们都知道在ASP.net开发中，如果使用用户定义控件可以有效的进行程序的模块化。其实在.net 的WinForm中也是可以使用的。
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;}
}
4、定义委托
//定义委托
public delegate void btnOkClickEventHander(object sender,EventArgs e);
public delegate void btnCancelClickEventHander(object sender,EventArgs e);
5、定义事件
//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
{
///

/// Form1 的摘要说明。
///

public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.Panel panel1;
private WindowsApplication1.UserLogin userLogin1;
///

/// 必需的设计器变量。
///

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
//
}
///

/// 清理所有正在使用的资源。
///

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
///

/// 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。
///

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
///

/// 应用程序的主入口点。
///

[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
{
///

/// UserControl1 的摘要说明。
///

/// //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;
///

/// 必需的设计器变量。
///

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
}
///

/// 清理所有正在使用的资源。
///

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
///

/// 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。
///

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);
}

}
}

调试环境Windows 2003+VS.net 2003.
Author:[e-mail]