.NET Core中的IServiceCollection中不提供UseNpgsql [英] UseNpgsql not available in IServiceCollection in .NET Core
问题描述
我在Visual Studio 2017中具有.NET Core项目。我试图添加(Postgresql)数据库连接。这是一个代码:
I have .NET Core project in Visual Studio 2017. I am trying to add (Postgresql) database connection. Here is a code:
public void ConfigureServices(IServiceCollection services)
{
services.AddMvc();
services.AddDbContext<ConexionWebApi>(options => {
options.UseNpgsql("ConnectionString", b => b.MigrationsAssembly("WebAPISample"));
});
}
但是useNpgsql会产生以下错误:
But useNpgsql generates the following error:
'DbContextOptionsBuilder'不包含'UseNpgsql'的定义,并且找不到扩展方法'UseNpgsl'接受类型为'DbContextOptionsBuilder'的第一个参数(您错过了using指令还是汇编引用?)
'DbContextOptionsBuilder' does not contain a definition for 'UseNpgsql' and no extension method 'UseNpgsl' accepting a first argument of type 'DbContextOptionsBuilder' could be found (are you missing a using directive or an assembly refence?)
我安装了以下NuGet软件包:
I installed the followings NuGet packages:
Microsoft.EntityFrameworkCore.Tools,
Npgsql.EntityFrameworkCore.PostgreSQL,
Npgsql.EntityFrameworkCore.PostgreSQL.Design.
我应该安装其他库吗?
推荐答案
我遇到了同样的问题。我通过使用Microsoft.EntityFrameworkCore添加
I had the same issue. I resolved it by adding
using Microsoft.EntityFrameworkCore;
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