Entity Framework连接postgresql，code first

官方介绍地址

http://www.npgsql.org/ef6/index.html

首先创建一个控制台应用程序 ，本例居于.NETFramework,Version=v4.6.1

安装包

EntityFramework6.Npgsql 

先写一个业务类

using System;

namespace EFCodeFirstConsole
{
    public class Blog
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public string Url { get; set; }
        public DateTime? CreateTime { get; set; }
        public double Double { get; set; }
        public float Float { get; set; }
    }
}

然后创建一个继承自EF上下文的类

using System.Data.Entity;

namespace EFCodeFirstConsole
{
    public class EfDbContext : DbContext
    {
        public EfDbContext():base("name=PgsqlConnStr")
        {
        }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            //EF 默认的schema 是dbo，但是PG默认是public，这里改一下
            modelBuilder.HasDefaultSchema("public");
        }
        public DbSet<Blog> Blogs { get; set; }
    }
}

创建配置类

using Npgsql;
using System.Data.Entity;

namespace EFCodeFirstConsole
{
    class NpgSqlConfiguration:DbConfiguration
    {
        public NpgSqlConfiguration()
        {
            var name = "Npgsql";

            SetProviderFactory(providerInvariantName: name,
            providerFactory: NpgsqlFactory.Instance);

            SetProviderServices(providerInvariantName: name,
            provider: NpgsqlServices.Instance);

            SetDefaultConnectionFactory(connectionFactory: new NpgsqlConnectionFactory());
        }
    }
}

在配置文件中增加数据库配置

  <connectionStrings>
    <add name="PgsqlConnStr" connectionString="Host=127.0.0.1;Port=5432;Database=EfDb;Username=dbuser;Password=dbpassword" providerName="Npgsql"/>
  </connectionStrings>

控制台Main方法创建数据库并插入数据

using System.Data.Entity;

namespace EFCodeFirstConsole
{
    class Program
    {
        static void Main(string[] args)
        {
            var Initializes = new DropCreateDatabaseAlways<EfDbContext>();
            using (var efDbContext = new EfDbContext())
            {
                Initializes.InitializeDatabase(efDbContext);
            }
            using (var efDbContext = new EfDbContext())
            {
                efDbContext.Blogs.Add(new Blog {
                    Name="Jeffcky",
                    Url="http://www.qq.com"
                });
                efDbContext.SaveChanges();
            }
        }
    }
}

参考：https://www.cnblogs.com/lyqf365/p/3978359.html