C# 窗体间传值（使用委托与自定义事件）

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
            }
        }
    }