用户控件中的DataGridview C＃.net中的事件问题 [英] DataGridview in User Control Event issue in C#.net

问题描述

亲爱的所有人，

我正致力于用户控制。在该用户COntrol中，我想从表单中添加一些新事件以进行访问（父表单）。

我为CellClicked和CellDoubleClick添加了新事件。

这里代码，

  //  声明 
  public   delegate   void  CellClickedEventHandler（< span class =code-keyword> object  sender，DataGridViewCellEventArgs e）; 
  public   event  CellClickedEventHandler CellClicked; 
 
  public   delegate   void  CellDoubleClickedEventHandler（ object  sender，DataGridViewCellEventArgs e）; 
  public   event  CellDoubleClickedEventHandler CellDoubleClicked; 
 
 
  //  函数 
 私有  void  CellClick（对象发​​件人，DataGridViewCellEventArgs e）
 {
  if （CellClicked！=  null ）
 CellClicked（< span class =code-keyword> this ，e）; 
} 
 
 私有  void  CellDouClick（ object  sender，DataGridViewCellEventArgs e）
 {
  if （CellDoubleClicked！=  null ）
 CellDoubleClicked（ this ，e）; 
} 

在构造函数上：

< datagridview name =   >  .CellClick + =  new  DataGridViewCellEventHandler（CellClicked）; 
< datagridview name =   > ;  .CellDoubleClick + =  new  DataGridViewCellEventHandler（CellDoubleClicked）; 
 

重建应用程序。错误列表中没有显示错误



拖动用户控件（Datagridview），我收到以下错误。

引用：

委托实例方法不能为空'this'

如何解决这个问题？

解决方案

http ：//stackoverflow.com/questions/3752824/delegate-to-an-instance-method-cannot-have-null-this [ ^ ]

试试此链接。

Dear All,
I am working on user Control. In that user COntrol , I want to add Some New events for access from the form(Parent form).
I added New Events for CellClicked and CellDoubleClick.
Here the Code,

//Declaration 
 public delegate void CellClickedEventHandler(object sender, DataGridViewCellEventArgs e);
 public event CellClickedEventHandler CellClicked;

 public delegate void CellDoubleClickedEventHandler(object sender, DataGridViewCellEventArgs e);
 public event CellDoubleClickedEventHandler CellDoubleClicked;


//Functions
  private void CellClick(object sender, DataGridViewCellEventArgs e)
        {
            if (CellClicked != null)
                CellClicked(this, e);
        } 

  private void CellDouClick(object sender, DataGridViewCellEventArgs e)
        {
            if (CellDoubleClicked != null)
                CellDoubleClicked(this, e);
        }

On the Constructor:

<datagridview name="">.CellClick += new DataGridViewCellEventHandler(CellClicked);
<datagridview name="">.CellDoubleClick += new DataGridViewCellEventHandler(CellDoubleClicked);

Rebuild the application. no error displayed on the Error List

Drag the User Control(Datagridview), I am getting following error.

Quote:

Delegate to an instance method cannot have null 'this'

How can i solve this?

解决方案

http://stackoverflow.com/questions/3752824/delegate-to-an-instance-method-cannot-have-null-this[^]
Try this link.

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