winform使用委托和事件来完成两个窗体之间通信的实例

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/// <summary>
    /// form1
    /// </summary>
    /// <param name="message"></param>
    public delegate void clickdelegatehander(string message); //声明一个委托
    public partial class form1 : form
    {
        public event clickdelegatehander clickevent;//声明一个事件
        public form1()
        {
            initializecomponent();
        }
        private void button1_click(object sender, eventargs e)
        {
            if (clickevent != null) //判断事件是否被注册
                clickevent("hello world");
        }
    }

/// <summary>
   /// form2
   /// </summary>
    public partial class form2 : form
    {
        public form2()
        {
             initializecomponent();
             form1 form1 = new form1();
             form1.clickevent += new clickdelegatehander(getmessage);//注册事件
             form1.show();
        }
        private void form2_load(object sender, eventargs e)
        {
        }
        public void getmessage(string message)
        {
            this.label1.text = message;
        }
    }

把form2设为启动项