EF 批量添加数据

原文：https://www.cnblogs.com/liuruitao/p/10049191.html

原文：https://www.cnblogs.com/yaopengfei/p/7751545.html

环境：

　　就只安装了两个包，除此之外无其它任何配置，
　　EntityFramework、Z.EntityFramework.Extensions

 一个简单的测试：

using System;
using System.Collections.Generic;
using System.Data.Entity;

namespace ConsoleApp2
{
    class Program
    {
        static void Main(string[] args)
        {
            using (var db = new BlogEntities())
            {
                //添加一条数据
                //Blog entity = new Blog();
                //entity.BlogId = 1;
                //entity.Title = "title1";
                //entity.CreateDate = DateTime.Now;
                //db.Blogs.Add(entity);
                //db.SaveChanges();

                //查看 添加的数据 和 数据库链接地址
                //int i = db.Blogs.ToList().Count;
                //var d = db.Blogs.FirstOrDefault();
                //var str = db.Database.Connection.ConnectionString;

                int total = ;

                //测试1
                DateTime dt1 = DateTime.Now;
                for (int i = ; i < total; i++)
                {
                    Blog entity = new Blog();
                    entity.BlogId = ;
                    entity.Title = "title" + i.ToString();
                    entity.CreateDate = DateTime.Now;
                    db.Blogs.Add(entity);
                    db.SaveChanges();
                }
                Console.WriteLine("不批量插入1：" + (DateTime.Now - dt1).TotalMilliseconds);

                //测试2 和测试1的区别 在于 db.SaveChanges(); 的位置
                DateTime dt2 = DateTime.Now;
                for (int i = ; i < total; i++)
                {
                    Blog entity = new Blog();
                    entity.BlogId = ;
                    entity.Title = "title" + i.ToString();
                    entity.CreateDate = DateTime.Now;
                    db.Blogs.Add(entity);
                }
                db.SaveChanges();
                Console.WriteLine("不批量插入2：" + (DateTime.Now - dt2).TotalMilliseconds);

                //测试3 需要引入Z.EntityFramework.Extensions  批量插入
                DateTime dt3 = DateTime.Now;
                List<Blog> list = new List<Blog>();
                for (int i = ; i < total; i++)
                {
                    Blog entity = new Blog();
                    entity.BlogId = ;
                    entity.Title = "title" + i.ToString();
                    entity.CreateDate = DateTime.Now;
                    list.Add(entity);
                }
                db.BulkInsert(list);
                db.SaveChanges();
                Console.WriteLine("批量插入：" + (DateTime.Now - dt3).TotalMilliseconds);

                Console.ReadKey();
            }
        }
    }

    public class Blog
    {
        public int BlogId { get; set; }
        public string Title { get; set; }
        public DateTime CreateDate { get; set; }
    }

    public class BlogEntities : DbContext
    {
        public DbSet<Blog> Blogs { get; set; }
    }

}