事件委托应用：在父控件中创建子控件，并接收值

传值过程使用委托方法

定义一个打开按扭，一个文本框

   /// <summary>
        /// 增加父控件
        /// </summary> 
      public void AddParent(BaseControl ctl)
        {
            foreach (Control ct2 in this.Parent.Controls) 
            { 
                if (ct2.Name == ctl.Name) {
                    ct2.Focus();
                    return;
                } 
            } 
            ctl.Width = 400; 
            ctl.Dock = DockStyle.Right;
            ctl.DisposedPassingChanged += Ctl_DisposedPassingChanged;//用于在【父>子】控件关闭时接收值
            //this.textEdit1.Text = ( ctl.Passing).Text;
              Console.WriteLine("方法4:开始创建子窗体");
            //ctl.Parent = this; 
            this.Parent.Controls.Add(ctl); 
        }

        //用于在【父>子】控件关闭时接收值
        private void Ctl_DisposedPassingChanged(object sender, PassingEventArgs e)
        {
            ShowSunControl source = sender as ShowSunControl;
            if(source!=null) 
            Console.WriteLine("方法5.1:已调用:" + source.Name.ToString());
            this.textEdit1.Text = ((DevExpress.XtraEditors.TextEdit)source.Passing).ToString();
            Console.WriteLine("方法5.2:已接受返回来的数据:" + source.Name.ToString());
        }

定义一个关闭按扭，一个文本框

   public ShowSunControl()
        {
            InitializeComponent();
            this.barButtonItem1.ItemClick += new DevExpress.XtraBars.ItemClickEventHandler(this.barButtonItem1_ItemClick);
            this.Passing = this.textEdit1;//传值绑定
            Console.WriteLine("方法1:窗体加载"  ); 
        }
     
        // 关闭的时候执行
        private void barButtonItem1_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
        {
            Console.WriteLine("方法2:您单击了关闭窗体。");
              this.Dispose();//触发传值
        }

        // 操作的时候执行
        private void textEdit1_EditValueChanging(object sender, DevExpress.XtraEditors.Controls.ChangingEventArgs e)
        { 
            Console.WriteLine("方法3:您正在输入值。");

        }

BaseControl.cs

定义委托、自定义事件

 public partial class BaseControl :  UserControl 
    {
        object passing;
        public object Passing
        {
            get { return passing; }
            set { passing = value; }
        }
        public object LogoPassing
        {
            get { return passing; }
            set { passing = value; }
        }
        public BaseControl():this(null)  
        {
            InitializeComponent();
        }

        public BaseControl(object value)
        {
            InitializeComponent();
            this.Disposed += BaseControl_Disposed1; 
            Passing = value; 
        }
        //事件发行者 关闭调用的时候先执行
        private void BaseControl_Disposed1(object sender, EventArgs e)
        {
            DisposedPassingChanged?.Invoke(this, new PassingEventArgs(Passing));
               Console.WriteLine("方法0:DisposedPassingChanged 已发生事件，目标已传出，查看调用窗体是否接收到数据。");
               this.Dispose();
        }
         
        public delegate void PassingEventHandler(object sender, PassingEventArgs e);
        public event PassingEventHandler DisposedPassingChanged;
       
    }
    public class PassingEventArgs :   EventArgs
    {
        private object passing = string.Empty;
        public PassingEventArgs(object args) 
        {
            passing = args;
        }
        public object Passing 
        {
            get { return passing; }
        }
    
    }

程序调用后，Console.WriteLine 输入结果如下：

//方法1:窗体加载
//方法4:开始创建子窗体
//方法3:您正在输入值。
//方法2:您单击了关闭窗体。
//方法5:已调用:ShowSunControl
//方法5:已接受返回来的数据:ShowSunControl
//方法0:DisposedPassingChanged 已发生事件，目标已传出，查看调用窗体是否接收到数据。

窗体中也接收到了数据，