确定发件人是哪个表格 [英] Determine which form was the sender

问题描述

我有一个带有Web浏览器的表单(form1)，可以用许多表单打开.根据打开该表单的形式，Web浏览器将打开一个不同的URL.

我尝试过这样的事情

I have a form (form1) with a webbrowser which can be opened by many forms. Depending on which form opens this form the webbrowser will open to a different URL.

I tried something like this

If sender Is frmRegInState Then
            Me.WebBrowser1.Url.ToString = ("www.yahoo.com") Then
            frmRegInState.Close()
        ElseIf sender Is frmRegOutOfState Then
            Me.WebBrowser1.Url.ToString = ("www.google.com") Then
            frmRegOutOfState.Close()
        End If

推荐答案

使用这样的url属性创建一个接口:

Create an interface with a url property like this :

public interface IUrlOwner
    {
        Uri Url
        {
            get;
            set;
        }
    }

然后使您的表单实现此接口.因此，表单将知道要打开哪个URL.
像这样:

Then make your form implement this interface. So the form will know which url to open.
like this :

public partial class DrawingWindow : Form,IUrlOwner 

当然，您必须实现该接口.所以您需要一个具体的吸气剂和吸气剂.
然后，您可以将发送方强制转换为接口，并在事件处理程序中获取url.

Of course you have to implement the interface. so you need a concrete getter and setter.
Then you can cast the sender to the interface and get to the url in your event handler.

(sender as IUrlOwner)Url

我的代码更像C#，但我希望您对VB.NET有足够的了解，以了解此处发生的情况.

My code is more like C# but I hope you know enough about VB.NET to understand what is going on here.

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