基于父页面的函数调用用户控件 [英] function call user control based on the parent pag

问题描述

我在Windows窗体应用程序中有一个用户控件，我需要基于父窗体调用diffrene methode，我的控件有两个父窗体......
我该怎么做才能帮助我

i have a user control in windows form application i need to raise diffrene methode based on the the parent form called my control have two parent form...........
how can i do pls help me

推荐答案

Don''t.相反，您可以采用另一种方式:在您的子表单中创建一个事件，父表单会订阅该事件.这样，孩子就不需要知道有关父母的存在的任何信息，它只是表示我有数据！".如果有兴趣，则父级将按要求进行处理.


在子窗体中:

Don''t. Instead, do it the other way: create an event in your child form, which the parent form subscribes to. That way, the child does not need to know anything about the existence of the parent - it just signals "I have data!" and the parent will process it as required if it is interested.


In the child form:

public partial class frmChild : Form
   {
   // Signal data change happened
   public event EventHandler Changed;

   protected virtual void OnChanged(EventArgs e)
      {
      EventHandler eh = Changed;
      if (eh != null)
         {
         eh(this, e);
         }
      }

   private void DoSomethingToChangeData()
      {
      OnChanged(null);
      }
   }

-----给eh的指示是如果处理程序在空检查之间进行更改
-----和执行.
-----(不太可能，但可能)

-----空检查是为了确保有处理程序.如果不是，最好
-----优雅地忽略它，而不是依靠抛出的异常
-----(NullReferenceException)

在家长表格中:

----- The asign to eh is in case the handler changes between null check
----- and exec.
----- (unlikely, but possible)

----- The null check is to ensure there is a handler. If not, better to
----- ignore it gracefully, than to rely on the thrown exception
----- (NullReferenceException)

In the Parent form:

private void ShowChildForm()
    {
    // Link in his event so if it changes, we detect it.
    frmChild fd = new frmChild();
    fd.Change += new frmChange.ChangeHandler(Changed);
    fd.ShowDialog();
    }

//
// Fired when the data is changed at a lower level.
//
private void Changed(object sender, EventArgs e)
    {
    }

在common文件中保留一个静态变量(ParentName)，例如common.cs

例子

公共静态字符串ParentName =";

在父级form1的Form_Load事件中

Keep One Static Variable (ParentName) in Common File like common.cs

Example

Public static string ParentName="";

On Form_Load event of your parent form1

Common.ParentName="Form1";

在父级form2的Form_Load事件中

On Form_Load event of your parent form2

Common.ParentName="Form2";

在Usercontrol中，在调用方法之前，请检查
开关(Common.ParentName)
{
案例"Form1":
//调用Method1;
休息；
案例"Form2":
调用Method1;
休息；
}

希望这会有所帮助！

In Usercontrol Before calling a method check
switch(Common.ParentName)
{
case "Form1":
//Call Method1;
break;
Case "Form2":
Call Method1;
break;
}

Hope this helps!

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