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(14, 179);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(75, 30);
            this.button1.TabIndex = 0;
            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(12, 93);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(125, 12);
            this.label1.TabIndex = 1;
            this.label1.Text = "设置子窗口的标题为：";
            // 
            // textBox1
            // 
            this.textBox1.Location = new System.Drawing.Point(14, 117);
            this.textBox1.Name = "textBox1";
            this.textBox1.Size = new System.Drawing.Size(228, 21);
            this.textBox1.TabIndex = 2;
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(292, 266);
            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(78, 122);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(150, 70);
            this.button1.TabIndex = 0;
            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(292, 266);
            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());
        }
    }
}