从用户控件调用父页面中的方法 [英] Calling a method in parent page from user control

问题描述

我在 aspx 页面中注册了一个用户控件在用户控件中的按钮单击事件时，如何调用父页面代码隐藏中的方法?

I've a user control registered in an aspx page On click event of a button in the user control, how do i call a method which is there in the parent page's codebehind?

谢谢.

推荐答案

这是 Freddy Rios 建议的使用事件的经典示例(来自 Web 应用程序项目的 C#).这假设您想使用现有的委托而不是自己创建委托，并且您没有通过事件参数传递任何特定于父页面的内容.

Here is the classic example using events as suggested by Freddy Rios (C# from a web application project). This assumes that you want to use an existing delegate rather than make your own and you aren't passing anything specific to the parent page by event args.

在用户控件的代码隐藏中(如果不使用代码隐藏或 C#，则根据需要进行调整):

In the user control's code-behind (adapt as necessary if not using code-behind or C#):

public partial class MyUserControl : System.Web.UI.UserControl
{
    public event EventHandler UserControlButtonClicked;

    private void OnUserControlButtonClick()
    {
        if (UserControlButtonClicked != null)
        {
            UserControlButtonClicked(this, EventArgs.Empty);
        }
    }

    protected void TheButton_Click(object sender, EventArgs e)
    {
        // .... do stuff then fire off the event
        OnUserControlButtonClick();
    }

    // .... other code for the user control beyond this point
}

在页面本身中，您可以通过以下方式订阅事件:

In the page itself you subscribe to the event with something like this:

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        // hook up event handler for exposed user control event
        MyUserControl.UserControlButtonClicked += new  
                    EventHandler(MyUserControl_UserControlButtonClicked);
    }
    private void MyUserControl_UserControlButtonClicked(object sender, EventArgs e)
    {
        // ... do something when event is fired
    }

}

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