用户控制2监听失败

Question

我有一个web表单和多个用户控件。其中一个用户控件触发一个事件。页面正在侦听并获取控件发送的值。然而，其他用户控件侦听附加到事件，但永远不会到达方法。

用户控制1

public delegate void GetOrgIdEventHandler(long orgId);
public event GetOrgIdEventHandler GetOrgId;
protected void gvSearchResults_SelectedIndexChanged(object sender, EventArgs e)
{
    if (GetOrgId != null)
    {
        GetOrgId(Id);
    }
}

Web表单

//Search1 is the Id of the User Control on the web form - This is working. 
//It calls the method in the assignment
Search1.GetOrgId += 
new SearchGridViewSelectedIndexChangedEventHandler(GetTheOrgId);

用户控制2

//SearchUserControl is the name of the User Control 2 Class
protected SearchUserControl mySuc = new SearchUserControl();
//The line below works, however the method does not get called. This is where it fails.
//I set a breakpoint in GetTheOrgId but I never get to that break.
mySuc.GetOrgId += new SearchGridViewSelectedIndexChangedEventHandler(GetTheOrgId);

Answer 1

是的，您可以在第一个控件中引发事件，在父控件中拾取它，然后让父控件调用第二个控件中的方法/函数。示例(在VB.Net中):

用户控制:

部分类user_controls_myControl继承System.Web.UI.UserControl

 Public Event DataChange As EventHandler
 'now raise the event somewhere, for instance when the page loads:
 Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
     RaiseEvent DataChange(Me, New EventArgs)
end sub
  end Class

这将在控件加载时引发一个名为datachchange的事件。或者，您可以在响应控件中的另一个事件时引发它(比如按钮被按下时)。这将引发一个父类可以订阅的事件，如下所示(假设页面上有一个名为MyControl1的控件):

主页:

Protected Sub myControl_dataChange(ByVal sender As Object, ByVal e As EventArgs) handles myControl1.DataChange

结束子

现在，您可以在第二个控件中公开一个方法，如下所示:

Partial Class user_controls_myOtherControl
    Inherits System.Web.UI.UserControl
    public sub callMe()
       'do something
    end Sub
end Class

然后，您可以从父页面调用第二个控件中的方法，如下所示:

me.userConrol2.callMe()