C#实现窗体间的通信

以下将窗体间的几种通信实现方式做一下罗列：首先新建一个窗体Form1，在其中放置一个Textbox、Button控件。再新建一个窗体Form2,其上放置一个Button控件。具体代码示例如下：

//Form1.cs

 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Drawing;
 using System.Linq;
 using System.Text;
 using System.Windows.Forms;

 namespace WindowsFormsApplication2
 {
     //03通过接口类进行通讯
     //public partial class Form1 : Form, Interface1
     public partial class Form1 : Form
     {
         public Form1()
         {
             InitializeComponent();
         }

         private void button1_Click(object sender, EventArgs e)
         {
             //00借助公共类在窗体间传递数据
             //Class1.str = textBox1.Text;
             //Form2 frm2 = new Form2();
             //frm2.Show();

             //01通过传窗口引用进行数据传递
             //Form2 frm2 = new Form2(this);
             //frm2.Show();

             //02通过传窗口引用进行数据传递
             //Form2 frm2 = new Form2(this.textBox1);
             //frm2.Show();

             //03通过接口类进行通讯
             //Form2 frm2 = new Form2(this);
             //frm2.Show();

             //04通过委托实现窗体间通信
             //Form2 frm2 = new Form2();
             //frm2.TitleChanged = new Form2.TitleChangedHandler(TitleChanged);
             //frm2.Show();

             //05通过自定义事件、事件参数进行窗体通信
             Form2 frm2 = new Form2();
             frm2.TitleChanged +=new Form2.TitleChangedEventHandler(FrmTitleChanged);
             frm2.Show();
         }

          //03通过接口类进行通讯
         //public void ChangeTitle(String sTitle)
         //{
         //    this.Text = sTitle;
         //}

         //04通过委托实现窗体间通信
         //protected void TitleChanged(String sTitle)
         //{
         //    this.Text = sTitle;
         //}

         //05通过自定义事件、事件参数进行窗体通信
         public void FrmTitleChanged(object sender, Form2.TitleChangedEventArgs e)
         {
             this.Text = e.Title;
         }

     }
 }

//Form1.Designer.cs

 namespace WindowsFormsApplication2
 {
     partial class Form1
     {
         /// <summary>
         /// 必需的设计器变量。
         /// </summary>
         private System.ComponentModel.IContainer components = null;

         /// <summary>
         /// 清理所有正在使用的资源。
         /// </summary>
         /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
         protected override void Dispose(bool disposing)
         {
             if (disposing && (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.button1 = new System.Windows.Forms.Button();
             this.label1 = new System.Windows.Forms.Label();
             this.textBox1 = new System.Windows.Forms.TextBox();
             this.SuspendLayout();
             //
             // button1
             //
             this.button1.Location = new System.Drawing.Point(, );
             this.button1.Name = "button1";
             this.button1.Size = new System.Drawing.Size(, );
             this.button1.TabIndex = ;
             this.button1.Text = "打开子窗口";
             this.button1.UseVisualStyleBackColor = true;
             this.button1.Click += new System.EventHandler(this.button1_Click);
             //
             // label1
             //
             this.label1.AutoSize = true;
             this.label1.Location = new System.Drawing.Point(, );
             this.label1.Name = "label1";
             this.label1.Size = new System.Drawing.Size(, );
             this.label1.TabIndex = ;
             this.label1.Text = "设置子窗口的标题为：";
             //
             // textBox1
             //
             this.textBox1.Location = new System.Drawing.Point(, );
             this.textBox1.Name = "textBox1";
             this.textBox1.Size = new System.Drawing.Size(, );
             this.textBox1.TabIndex = ;
             //
             // Form1
             //
             this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
             this.ClientSize = new System.Drawing.Size(, );
             this.Controls.Add(this.textBox1);
             this.Controls.Add(this.label1);
             this.Controls.Add(this.button1);
             this.Name = "Form1";
             this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
             this.Text = "Form1";
             this.ResumeLayout(false);
             this.PerformLayout();

         }

         #endregion

         private System.Windows.Forms.Button button1;
         private System.Windows.Forms.Label label1;
         private System.Windows.Forms.TextBox textBox1;
     }
 }

//Form2.cs

 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Drawing;
 using System.Linq;
 using System.Text;
 using System.Windows.Forms;

 namespace WindowsFormsApplication2
 {
     public partial class Form2 : Form
     {
         //01通过传窗口引用进行数据传递
         //private Form1 frm1;
         //public Form2(Form1 f)
         //{
         //    this.frm1 = f;
         //    InitializeComponent();
         //}

         //02通过传窗口引用进行数据传递
         //private TextBox tb;
         //public Form2(TextBox tb)
         //{
         //    this.tb = tb;
         //    InitializeComponent();
         //}

         //03通过接口类进行通讯
         //private Interface1 iChangeTitle;
         //public Form2(Interface1 iChangeTitle)
         //{
         //    InitializeComponent();
         //    this.iChangeTitle = iChangeTitle;

         //}

         //04通过委托实现窗体间通信
         //public delegate void TitleChangedHandler(String sTitle);//声明委托
         //public TitleChangedHandler TitleChanged;//定义委托
         //public Form2()
         //{
         //    InitializeComponent();
         //}

         //05通过自定义事件、事件参数进行窗体通信
         public class TitleChangedEventArgs : EventArgs
         {
             private String sTitle;
             public String Title
             {
                 set { sTitle = value; }
                 get { return sTitle; }
             }
         }

         //声明事件委托
         public delegate void TitleChangedEventHandler(object sender, TitleChangedEventArgs e);
         //定义事件
         public event TitleChangedEventHandler TitleChanged;

         public Form2()
         {
             InitializeComponent();
         }

         private void button1_Click(object sender, EventArgs e)
         {
             //借助公共类在窗体间传递数据
             //this.Text = Class1.str;

             //01通过传窗口引用进行数据传递
             //frm1.Text = "通过传窗口引用进行数据传递";//修改父窗标题

             //TextBox tb = frm1.Controls[0] as TextBox;
             //this.Text = tb.Text;//利用父窗的textbox1控件内容修改子窗标题

             //02通过传窗口引用进行数据传递
             //this.Text = tb.Text;

             //03通过接口类进行通讯
             //iChangeTitle.ChangeTitle("通过接口类进行通讯");//改写父窗标题

             //04通过委托实现窗体间通信
             //if (TitleChanged != null)
             //{
             //    TitleChanged("04通过委托实现窗体间通信");
             //}

             //05通过自定义事件、事件参数进行窗体通信
             TitleChangedEventArgs eTitle = new TitleChangedEventArgs();
             eTitle.Title = "05通过自定义事件、事件参数进行窗体通信";
             OnTitleChanged(eTitle);
         }

         //05通过自定义事件、事件参数进行窗体通信
         protected virtual void OnTitleChanged(TitleChangedEventArgs e)
         {
             if (TitleChanged != null)
             {
                 TitleChanged(this, e);
             }

         }
     }
 }

//Form2.Designer.cs

 namespace WindowsFormsApplication2
 {
     partial class Form2
     {
         /// <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 Windows Form 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.button1 = new System.Windows.Forms.Button();
             this.SuspendLayout();
             //
             // button1
             //
             this.button1.Location = new System.Drawing.Point(, );
             this.button1.Name = "button1";
             this.button1.Size = new System.Drawing.Size(, );
             this.button1.TabIndex = ;
             this.button1.Text = "取得母窗体传过来的文本作为窗体标题";
             this.button1.UseVisualStyleBackColor = true;
             this.button1.Click += new System.EventHandler(this.button1_Click);
             //
             // Form2
             //
             this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
             this.ClientSize = new System.Drawing.Size(, );
             this.Controls.Add(this.button1);
             this.MaximizeBox = false;
             this.Name = "Form2";
             this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
             this.Text = "Form2";
             this.ResumeLayout(false);

         }

         #endregion

         private System.Windows.Forms.Button button1;
     }
 }

//Class1.cs

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;

 namespace WindowsFormsApplication2
 {
     //00借助公共类在窗体间传递数据
     //class Class1
     //{
     //    public static string str;
     //}
 }

//Interface1.cs

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;

 namespace WindowsFormsApplication2
 {
     public interface Interface1
     {
         void ChangeTitle(String sTitle);
     }
 }

//Program.cs

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Windows.Forms;

 namespace WindowsFormsApplication2
 {
     static class Program
     {
         /// <summary>
         /// 应用程序的主入口点。
         /// </summary>
         [STAThread]
         static void Main()
         {
             Application.EnableVisualStyles();
             Application.SetCompatibleTextRenderingDefault(false);
             Application.Run(new Form1());
         }
     }
 }