C#程序窗体间使用回调事件方式通讯示例

form2：

//定义一个需要string类型参数的委托        
publicdelegate void mydelegate(string text);        
public partial class form2 :form1    
    {        
       //定义该委托的事件    
        public event mydelegate myevent;    
        public form2(string text)    
        {     
            initializecomponent();    
            this.textbox1.text = text;    
       }    
       private void btnchange_click(object sender, eventargs e)                  
       {    

           //触发事件，并将修改后的文本回传    
           myevent(this.textbox1.text);    
           this.close();    
        }    
   }

form1:

public partial class form1 :form    
    {    
        public int index = 0;    
        public string text = null;    
        public form1()    
        {    
            initializecomponent();    
        }    

        private void listbox1_selectedindexchanged(object sender, eventargse)    
        {    
            if (this.listbox1.selecteditem != null)    
            {    
                text = this.listbox1.selecteditem.tostring();    
                index = this.listbox1.selectedindex;    
                form2 form2 = new form2(text);    

               //注册form2_myevent方法的myevent事件    
                form2.myevent += new mydelegate(form2_myevent);    
                form2.show();    
            }    
        }    

       //处理    

        void form2_myevent(string text)    
        {    
            this.listbox1.items.removeat(index);    
            this.listbox1.items.insert(index, text);    
       }    
   }