我想在ASP.NET MVC 4项目中使用实体框架6与PostgreSQL。我得到了实体框架6.0.2 + Npgsql 2.0.14.3,但我得到错误。我该如何解决?实体框架6与Npgsql
错误:
An exception of type 'System.InvalidOperationException' occurred in mscorlib.dll but was not handled in user code
Additional information: The 'Instance' member of the Entity Framework provider type 'Npgsql.NpgsqlServices, Npgsql, Version=2.0.14.3, Culture=neutral, PublicKeyToken=5d8b90d52f46fda7' did not return an object that inherits from 'System.Data.Entity.Core.Common.DbProviderServices'. Entity Framework providers must inherit from this class and the 'Instance' member must return the singleton instance of the provider. This may be because the provider does not support Entity Framework 6 or later; see http://go.microsoft.com/fwlink/?LinkId=260882 for more information.
的Web.config
<system.data>
<DbProviderFactories>
<add name="Npgsql Data Provider"
invariant="Npgsql"
description="Data Provider for PostgreSQL"
type="Npgsql.NpgsqlFactory, Npgsql" />
</DbProviderFactories>
</system.data>
<connectionStrings>
<add name="DatabaseContext" connectionString="Server=localhost;port=5432;Database=main;User Id=postgres;Password=password;" providerName="Npgsql" />
</connectionStrings>
<entityFramework>
<providers>
<provider invariantName="Npgsql" type="Npgsql.NpgsqlServices, Npgsql" />
</providers>
</entityFramework>
我刚刚创建的,在另一个问题的答案。请看看它:http://stackoverflow.com/a/21839153/246097 –