如何使用实体框架从数据库加载行？

我运行了实体框架，它创建了几个类（实际上是几个类），如下所示：

I ran the entity framework and it created a couple of classes (actually several classes) like this:

namespace EFTest
{
    using System;
    using System.Collections.Generic;
    
    public partial class SalesRepresentative
    {
        public int ID { get; set; }
        public string Name { get; set; }
        public string Email { get; set; }
        public string CellPhone { get; set; }
    }
}

public partial class SalesEntities : DbContext
{
    public SalesEntities()
            : base("name=SalesEntities")
    {
    }
    
    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        throw new UnintentionalCodeFirstException();
    }
    
    public DbSet<SalesRepresentative> SalesRepresentatives { get; set; }
    public DbSet<Sales_Regions> Sales_Regions { get; set; }
    public DbSet<SalesRegion> SalesRegions { get; set; }
    public DbSet<State> States { get; set; }
    public DbSet<Territory_Descriptions> Territory_Descriptions { get; set; }
 }

我找到了一个使用它们的例子：

And I found an example of using them like this:

SalesRepresentative sr;
using (var ef = new SalesEntities())
{
    sr = new SalesRepresentative() { ID = IDin };
    ef.SalesRepresentatives.Add(sr);
    ef.SaveChanges();
}

但教程没有提到有关加载记录的任何内容。  我在这里看了整个地方&https：//msdn.microsoft.com/en-us/data/ee712907但找不到任何东西。  有人可以指点我的教程解释如何阅读行
或给我一个代码片段吗？

But the tutorial did not mention anything about loading a record.  I looked all over the place here https://msdn.microsoft.com/en-us/data/ee712907 but could not find anything.  Can someone point me to a tutorial that explains how to read rows or give me a code snippet?

谢谢