如何在VB.NET中使用以下用C＃编写的事件/代理？ [英] How can I use the following events/delegates, written in C#, in VB.NET?

问题描述

我在ASP.NET网络应用中使用JdSoft的APNS-Sharp库。该库是用C＃编写的，并且出于线程目的广泛使用了委托函数和事件。我的应用程序是用VB.NET编写的，我对如何转换以下示例代码（C＃）感到有些困惑：

I'm using JdSoft's APNS-Sharp library in my ASP.NET web app. The library is written in C#, and makes extensive use of Delegate Functions and Events for threading purposes. My application is written in VB.NET, and I'm a little confused on about how to translate the following sample code (C#):

....
//Wireup the events
service.Error += new FeedbackService.OnError(service_Error);
....
}

static void service_Error(object sender, Exception ex)
{
Console.WriteLine(...);
}

以下是FeedbackService类的相关成员：

Here are the relevant members of the FeedbackService class:

public delegate void OnError(object sender, Exception ex);
public event OnError Error;

基本上，我试图弄清楚如何将函数（如service_Error）附加到事件上（如错误）在VB.NET中。我不清楚在这种情况下+ =语法的含义，VisualStudio表示由于某些原因我的VB.NET代码无法直接访问错误事件。

Basically, I'm trying to figure out how to attach a function (like service_Error) to an event (like Error) in VB.NET. I'm unclear on what the += syntax means in this context, and VisualStudio says that the 'Error' event cannot be accessed directly by my VB.NET code for some reason.

推荐答案

+ = 运算符基本上是在订阅 FeedbackService.OnError 函数添加到 Error 调用列表。因此，当引发 Error 事件时，将调用 OnError 方法。

The += operator is basically subscribing the FeedbackService.OnError function to the Error invocation list. So when the Error event is raised, the OnError method is invoked.

要将上面的代码转换为VB.NET，看起来应该像这样：

To translate the above code to VB.NET, it would look something like:

// define delelgate/event
Public Delegate Sub OnError(sender As Object, ex As Exception)
Public Event OnError Error

// attach method to event
AddHandler service.Error, service_Error

请参见如何进行：引发和消耗事件，用于VB.NET中的某些示例。

See How to: Raise and Consume Events for some examples in VB.NET.

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