Winform界面之间传值

通过系统自带的事件传值 

public event EventHandler SendMsgEvent;//使用默认的事件处理委托
Form2 f2=new Form();
SendMsgEvent+=f2.MainFormTxtChaed;//为子窗体注册事件
f2.Show();
SendMsgEvent(this,new MyEventArg(){Text=this.txtMsg.Text});


internal void MainFormTxtChaned(object Sender,EventArgs e){
  MyEventArg arg=e as MyEventArg;
  this.SetText(arg.Text);
}

   public void SetText(string txt)
        {
            this.txtMsg.Text = txt;
        }
 public void AfterParentFrmTextChange(object sender, EventArgs e)
        {
            //拿到父窗体的传来的文本
            MyEventArg arg = e as MyEventArg;
            this.SetText(arg.Text);
        }

通过保存对象的引用调用的对象的公有方法实现窗体的传值

 public ObeserverFormA ChildFormA { get; set; }
  public ObeserverFormB ChildFormB { get; set; }
   ObeserverFormA childFormA = new ObeserverFormA();
            ChildFormA = childFormA;
            childFormA.Show();
            ObeserverFormB childFormB = new ObeserverFormB();
            ChildFormB = childFormB;
            childFormB.Show();
 ChildFormA.SetText(this.txtMsg.Text);
            ChildFormB.SetText(this.txtMsg.Text); 

定义发布消息的委托  委托是一个类型 委托可以在外部获得执行

 public Action SendMsg { get; set; } 
 ObeserverFormA childFormA = new ObeserverFormA();
            SendMsg += childFormA.SetText;//委托赋值
            childFormA.Show();
            ObeserverFormB childFormB = new ObeserverFormB();
            SendMsg += childFormB.SetText;
            childFormB.Show(); 
 if (SendMsg!=null)
            {
                SendMsg(this.txtMsg.Text);//执行所有注册的委托
            }

链接：https://pan.baidu.com/s/114V3u7GYEtDbWYkf0fSjyg 
提取码：no94