如何使用匿名方法动态订阅事件？

发布于 2024-07-30 17:44:16 字数 778 浏览 2 评论 0原文

我正在使用 LoadControl(String) 动态创建多个 UserControl，并希望订阅每个用户的事件。

我的所有控件都继承了一个公共接口，需要实现一个公共事件：

public interface IObjectProcessor
{
    event EventHandler<ObjectProcessedEventArgs> ObjectProcessed;
}

所以我接下来在页面加载事件上做：

protected void Page_Load()
{
   switch(Request["type"])
   {
     case "user":
     {
        LoadControl("AddUser.ascx", delegate(object sender, ObjectProcessedEventArgs e)
        {
           // do something
        });
        break;
     }
   }
}

private void LoadControl(string path, Action<object, ObjectProcessedEventArgs> action)
{
    var control = (IObjectProcessor)LoadControl(path)
    control.ObjectProcessed // here!
}

如何订阅此事件的委托？

原文

I'm creating a number of UserControls dynamically using LoadControl(String) and want to subscribe to an event of each of them.

All my controls inherits a common Interface that require an implementation of a common Event:

public interface IObjectProcessor
{
    event EventHandler<ObjectProcessedEventArgs> ObjectProcessed;
}

So I do next on my page loading event:

protected void Page_Load()
{
   switch(Request["type"])
   {
     case "user":
     {
        LoadControl("AddUser.ascx", delegate(object sender, ObjectProcessedEventArgs e)
        {
           // do something
        });
        break;
     }
   }
}

private void LoadControl(string path, Action<object, ObjectProcessedEventArgs> action)
{
    var control = (IObjectProcessor)LoadControl(path)
    control.ObjectProcessed // here!
}

How to subscribe a deleagte to this event?

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浸婚纱 2024-08-06 17:44:16

将 Action 更改为 EventHandler：

private void LoadControl(string path, EventHandler<ObjectProcessedEventArgs> handler)
{
        var control = (IObjectProcessor)LoadControl(path)
        control.ObjectProcessed += handler;
}

Change Action<object, ObjectProcessedEventArgs> to EventHandler<ObjectProcessedEventArgs>:

private void LoadControl(string path, EventHandler<ObjectProcessedEventArgs> handler)
{
        var control = (IObjectProcessor)LoadControl(path)
        control.ObjectProcessed += handler;
}

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