using System;using System.Drawing;using System.Windows.Forms;namespace 跨窗体调用控件{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private void button1_Click(object sender, EventArgs e)        {            Form2 f = new Form2();            f.ChangeColor += new ChangeFormColor(f_ChangeColor);            f.Show();        }        void f_ChangeColor(bool topmost)        {            this.BackColor = Color.LightBlue;            this.Text = "改变成功";        }    }}

using System;  using System.Windows.Forms;    namespace 跨窗体调用控件  {      public delegate void ChangeFormColor(bool topmost);      public partial class Form2 : Form      {          public Form2()          {              InitializeComponent();          }          public event ChangeFormColor ChangeColor;          private void button1_Click(object sender, EventArgs e)          {              ChangeColor(true);//执行委托实例          }      }  }