为什么会出现在我的抽象基类此编译错误？ [英] Why am I getting this compilation error in my abstract base class?

问题描述

我想延长这个插件是我自己用...

I'm trying to extend this plugin for my own use...

的 https://github.com/jamesmontemagno/Xamarin.Plugins/blob/master/Connectivity/Connectivity/Connectivity.Plugin.Abstractions/BaseConnectivity的.cs

但是，当我到Visual Studio中的代码复制，我我收到的一些错误。

But when I copy the code over to Visual Studio, I'm am getting some error.

我是否需要输入一些特殊的框架，以使用' =>'运算符和调用方法？这是一个抽象基类。我使用VS2013

Do I need to import some special framework in order to use the '=>' operator and 'Invoke' Method? This is an abstract base class. I am using VS2013

推荐答案

？从C＃6，和以及（用于表达健全成员时）=>操作符功能，仅在Visual Studio中2015年之前。

?. is a feature from C# 6, and as well as the => operator (when used for expression-bodied members), is available in Visual Studio 2015 only.

阅读有关他们在这里空条件运算符这里 =>运算符

Read about them here null-conditional operators and here => operator

C＃< 6语法：

C# < 6 syntax:

protected virtual void OnConnectivityChanged(ConnectivityChangedEventArgs e)
{
    if (ConnectivityChanged != null)
        ConnectivityChanged.Invoke(this, e);
}

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