C# Code:

public static void Do()
{
   using (var context = new UserDbContext())
   {
      context.Database.Log = Console.Write;
      
      Console.WriteLine("Entity Framework(EF)：测试DbContext的Add,Remove相同对象是否执行两次SQL");
      
      EFUser model = new EFUser() { Id = 11, Name = "www.CSframework.com" };
      
      var result = context.Users.Add(model);
      context.Users.Remove(model);
      
      int i = context.SaveChanges();
      Console.WriteLine("Save Changes Result:" + i.ToString());
   }
   
   Console.ReadLine();
}

//来源:C/S框架网(www.csframework.com) QQ:23404761