窗体传值的两种实现方法示例

 1     public partial class Form1 : Form
 2     {
 3         public Form1()
 4         {
 5             InitializeComponent();
 6         }
 7       
 8         private void button1_Click(object sender, EventArgs e)
 9         {
10             //通过Form2的构造函数将Form1对象传递到Form2中
11             Form2 form2 = new Form2(this);
12             form2.Show();
13         }
14     }

 1     public partial class Form2 : Form
 2     {
 3         //首先在Form2中定义Form1类型字段用来存储Form1对象
 4         Form1 form1=null;
 5         Random r = new Random();
 6         public Form2()
 7         {
 8             InitializeComponent();
 9         }
10         public Form2(Form1 form):this()
11         {
12             //通过构造方法将Form1对象给Form2字段赋值
13             form1 = form;
14         }
15         private void button1_Click(object sender, EventArgs e)
16         {
17             //随机改变Form1的背景颜色
18             form1.BackColor = Color.FromArgb(r.Next(256),r.Next(256),r.Next(256));
19         }
20     }

 1     public partial class Form1 : Form
 2     {
 3         public Form1()
 4         {
 5             InitializeComponent();
 6         }
 7 
 8         private void button1_Click(object sender, EventArgs e)
 9         {
10             Form2 form2 = new Form2(ShowMsg);
11             form2.Show();
12         }
13 
14         //将这个方法通过构造函数传递给Form2
15         public void ShowMsg(string msg)
16         {
17             label1.Text = msg;
18         }
19     }

 1     //在这里声明的委托需要与要传递的方法有相同的签名
 2     public delegate void DelTest(string msg);
 3 
 4     public partial class Form2 : Form
 5     {
 6         //声明委托字段用来存储Form1传来方法
 7         public DelTest _del;
 8         public Form2(DelTest del)
 9         {
10             _del = del;
11         }
12 
13         private void button1_Click(object sender, EventArgs e)
14         {
15             //执行委托回传数据
16             _del(textBox1.Text);
17         }
18     }