事件委托应用：在父控件中创建子控件，并接收值

 1    /// <summary>
 2         /// 增加父控件
 3         /// </summary> 
 4       public void AddParent(BaseControl ctl)
 5         {
 6             foreach (Control ct2 in this.Parent.Controls) 
 7             { 
 8                 if (ct2.Name == ctl.Name) {
 9                     ct2.Focus();
10                     return;
11                 } 
12             } 
13             ctl.Width = 400; 
14             ctl.Dock = DockStyle.Right;
15             ctl.DisposedPassingChanged += Ctl_DisposedPassingChanged;//用于在【父>子】控件关闭时接收值
16             //this.textEdit1.Text = ( ctl.Passing).Text;
17               Console.WriteLine("方法4:开始创建子窗体");
18             //ctl.Parent = this; 
19             this.Parent.Controls.Add(ctl); 
20         }
21 
22         //用于在【父>子】控件关闭时接收值
23         private void Ctl_DisposedPassingChanged(object sender, PassingEventArgs e)
24         {
25             ShowSunControl source = sender as ShowSunControl;
26             if(source!=null) 
27             Console.WriteLine("方法5.1:已调用:" + source.Name.ToString());
28             this.textEdit1.Text = ((DevExpress.XtraEditors.TextEdit)source.Passing).ToString();
29             Console.WriteLine("方法5.2:已接受返回来的数据:" + source.Name.ToString());
30         }

 1    public ShowSunControl()
 2         {
 3             InitializeComponent();
 4             this.barButtonItem1.ItemClick += new DevExpress.XtraBars.ItemClickEventHandler(this.barButtonItem1_ItemClick);
 5             this.Passing = this.textEdit1;//传值绑定
 6             Console.WriteLine("方法1:窗体加载"  ); 
 7         }
 8      
 9         // 关闭的时候执行
10         private void barButtonItem1_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
11         {
12             Console.WriteLine("方法2:您单击了关闭窗体。");
13               this.Dispose();//触发传值
14         }
15 
16         // 操作的时候执行
17         private void textEdit1_EditValueChanging(object sender, DevExpress.XtraEditors.Controls.ChangingEventArgs e)
18         { 
19             Console.WriteLine("方法3:您正在输入值。");
20 
21         }

 1  public partial class BaseControl :  UserControl 
 2     {
 3         object passing;
 4         public object Passing
 5         {
 6             get { return passing; }
 7             set { passing = value; }
 8         }
 9         public object LogoPassing
10         {
11             get { return passing; }
12             set { passing = value; }
13         }
14         public BaseControl():this(null)  
15         {
16             InitializeComponent();
17         }
18 
19         public BaseControl(object value)
20         {
21             InitializeComponent();
22             this.Disposed += BaseControl_Disposed1; 
23             Passing = value; 
24         }
25         //事件发行者 关闭调用的时候先执行
26         private void BaseControl_Disposed1(object sender, EventArgs e)
27         {
28             DisposedPassingChanged?.Invoke(this, new PassingEventArgs(Passing));
29                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。");
30                this.Dispose();
31         }
32          
33         public delegate void PassingEventHandler(object sender, PassingEventArgs e);
34         public event PassingEventHandler DisposedPassingChanged;
35        
36     }
37     public class PassingEventArgs :   EventArgs
38     {
39         private object passing = string.Empty;
40         public PassingEventArgs(object args) 
41         {
42             passing = args;
43         }
44         public object Passing 
45         {
46             get { return passing; }
47         }
48     
49     }

1 //方法1:窗体加载
2 //方法4:开始创建子窗体
3 //方法3:您正在输入值。
4 //方法2:您单击了关闭窗体。
5 //方法5:已调用:ShowSunControl
6 //方法5:已接受返回来的数据:ShowSunControl
7 //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。