成员MySql.Data.MySqlClient.MySqlException，MySql.Data没有解析ASP.NET MVC Type

Question

I added a new property to my model of an ASP.NET MVC 5.2 application with MySQL database, and now I'd like to add a database migration for this by using this command:

Add-Migration RegisterPropertyAdded

But, I get an exception:

Type is not resolved for member MySql.Data.MySqlClient.MySqlException,MySql.Data, Version=6.9.7.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d

It seems that MySQL wants to throw an exception but can't find the exception class for reasons I don't understand. I installed the following NuGet packages in the project:

EntityFramework Version 6.1.3

MySql.Data Version 6.9.7

MySql.Data.Entities, Version 6.8.3.0

MySql.Data.Entity Version 6.9.7

In the model, the class MySql.Data.MySqlClient.MySqlException is shown, so it seems like the class exists and I can't find any information that additional packages are required for the exception class.

Answer 1

In order to see this exception you have to update MySQL Connector/Net
Also make sure that MySQL server is up and running and you can connect to it.

Answer 2

对我来说，由于Web.config中的连接字符串不正确而出现此消息。