1.Could not load type 'System.Data.Entity.Infrastructure.TableExistenceChecker' from assembly 'EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.
解决方案：项目中引用的ef版本和packages.config中版本不一致，以ackages.config中为准，用nuget更新；
2.System.InvalidOperationException:“No Entity Framework provider found for the ADO.NET provider with invariant name 'System.Data.SqlClient'. Make
sure the provider is registered in the 'entityFramework' section of the application config file.
解决方案：EF的dll文件不在当前项目的bin文件夹下；