错误CS0012：类型＆＃39; DbConnection＆＃39;在未引用的程序集中定义

Question

我收到了这个错误

错误CS0012：类型＆＃39; DbConnection＆＃39;在未引用的程序集中定义。您必须添加对程序集的引用，System.Data，Version = 4.0.0.0，Culture = neutral，PublicKeyToken = b77a5c561934e089＆＃39;。 （CS0012）

我试图这样做：

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有人可以帮助我吗？

Answer 1

I solved it by going to Project - Add references then I manually add System.Data on Mac... I don't know about VS windows but hopefully it's the same