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

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

{

/// <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);

}

}

}

调试环境Windows 2003+VS.net 2003.

Author:lifuwang@msn.com

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