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
> {
> ///

1<summary>   
2&gt;  /// Form1 的摘要说明。   
3&gt;  /// </summary>

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

1<summary>   
2&gt;  /// 必需的设计器变量。   
3&gt;  /// </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
> //
> } >> >> ///

1<summary>   
2&gt;  /// 清理所有正在使用的资源。   
3&gt;  /// </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
> ///

1<summary>   
2&gt;  /// 设计器支持所需的方法 - 不要使用代码编辑器修改   
3&gt;  /// 此方法的内容。   
4&gt;  /// </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 >> >> ///

1<summary>   
2&gt;  /// 应用程序的主入口点。   
3&gt;  /// </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
> {
> ///

1<summary>   
2&gt;  /// UserControl1 的摘要说明。   
3&gt;  /// </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;
> ///

1<summary>   
2&gt;  /// 必需的设计器变量。   
3&gt;  /// </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 >> >> } >> >> ///

1<summary>   
2&gt;  /// 清理所有正在使用的资源。   
3&gt;  /// </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
> ///

1<summary>   
2&gt;  /// 设计器支持所需的方法 - 不要使用代码编辑器   
3&gt;  /// 修改此方法的内容。   
4&gt;  /// </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:[email protected]