The Entity Framework provider type 'System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer' registered in the application config file for the ADO.NET provider with invariant name

可以强迫部署EntityFramework.SqlServer.dll这个文件到输出目录

找到1个老外的帖子，戳这里（本人测试无效，大家有可能试一下。。）

解决方案以下：

在EF的上下文代码CS文件（Model1.Context.cs）中添加这个方法

public void FixEfProviderServicesProblem() { //The Entity Framework provider type 'System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer' //for the 'System.Data.SqlClient' ADO.NET provider could not be loaded. //Make sure the provider assembly is available to the running application. //See http://go.microsoft.com/fwlink/?LinkId=260882 for more information. var instance = System.Data.Entity.SqlServer.SqlProviderServices.Instance; }