http://www.cnblogs.com/xiaofengfeng/p/3182056.html

推荐使用第6与第7方法

1.通过构造函数

特点：传值是单向的（不可以互相传值），实现简单实现代码如下：在窗体Form2中      int value1;string value2;public Form2 ( int value1 , string value2 ){    InitializeComponent ( );    this.value1 = value1;    this.value2 = value2;}在窗体Form1中这样调用new Form2 ( 111 , "222" ).Show ( );  //这样就把111,"222",这2个值传送给了Form2

 

 

2.通过静态变量

特点：传值是双向的，实现简单实现代码如下：在一个app类中定义一个静态成员valuepublic class app{  public static string value;}在窗体Form1中这样调用app.value = "f2";        //给静态成员赋值new Form2 ( ).Show ( );  //显示Form2在窗体Form2中     this.Text = app.value;  //取回app.value的值app.value = "Form2";    //给app.value赋值，以便其他窗体调用

3.通过窗体的公有属性值

 

特点：实现简单实现代码如下：在窗体Form2中定义一个公有属性Form2Value,获取和设置textBox1的文本值public string Form2Value{    get    {        return this.textBox1.Text;    }    set    {        this.textBox1.Text = value;    }}在窗体Form1中这样调用Form2 f2 = new Form2 ( );f2.Form2Value = "Ok";     //给Form2的textBox1赋值Okf2.ShowDialog (  );

特点：实现简单,灵活实现代码如下：在窗体Form1中public int Form1Value = 1;Form2 f2 = new Form2 ( );f2.ShowDialog ( this );       //把Form1作为Form2的所有者传递给Form2在窗体Form2中//Form2的所有者是Form1Form1 f1 = ( Form1 ) this.Owner;//取到Form1的值是1MessageBox.Show ( f1.Form1Value .ToString ( ) );//给Form1的Form1Value赋值222f1.Form1Value = 222;

5.通过窗体的公有属性值和Application.OpenForms属性

 

说明：Application.OpenForms属性：获取属于应用程序的打开窗体的集合。(此属性在 .NET Framework2.0版中)实现代码如下：在窗体Form1中public int Form1Value = 1;Form2 f2 = new Form2 ( );f2.Show ( );在窗体Form2中string formName = "Form1";Form fr = Application.OpenForms [ formName ];if ( fr != null ){    Form1 f1 = ( Form1 ) fr;    //取到Form1的值是1    MessageBox.Show ( f1.Form1Value.ToString ( ) );    //给Form1的Form1Value赋值222    f1.Form1Value = 222;}

 

6.通过事件

 

实现代码如下：在窗体Form2中定义公有属性Form2Value,获取和设置textBox1的文本值并且还定义一个accept事件public string Form2Value{    get    {        return this.textBox1.Text;    }    set    {        this.textBox1.Text = value;    }}public event EventHandler accept;     private void button1_Click ( object sender , EventArgs e ){    if ( accept != null )    {        accept ( this , EventArgs.Empty );  //当窗体触发事件，传递自身引用    }}在窗体Form1中Form2 f2 = new Form2 ( );f2.accept += new EventHandler ( f2_accept );f2.Show ( );void f2_accept ( object sender , EventArgs e ){ //事件的接收者通过一个简单的类型转换得到Form2的引用    Form2 f2 = (Form2) sender; //接收到Form2的textBox1.Text    this.textBox1.Text = f2.Form2Value;}

 

7：通过控件赋值

public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private void button1_Click(object sender, EventArgs e)        {            Form2 frm2 = new Form2();            frm2.Show(this);//或 frm2.ShowDialog(this);            或者            //Form2 frm2 = new Form2();            //frm2.Owner = this;            //frm2.Show();//或 frm2.ShowDialog();        }    }    public partial class Form2 : Form    {        public Form2()        {            InitializeComponent();        }        private void button2_Click(object sender, EventArgs e)        {            Form1 frm1 = (Form1)this.Owner;     //注意 如果textBox1是放在panel1中的 则先找panel1 再找textBox1       如果是Panel中的textbox1     //Panel pl = (Panel)(frm1.Controls["panel1"]);           // ((TextBox)pl.Controls["textBox1"]).Text = this.textBox2.Text;            ((TextBox)frm1.Controls["textBox1"]).Text = this.textBox2.Text;            this.Close();        }    }