精致小巧简单的映射

本文介绍了精致小巧简单的映射的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

表：

create table Documents 
   (Id int, 
    SomeText varchar(100), 
    CustomerId int, 
    CustomerName varchar(100)
   )

insert into Documents (Id, SomeText, CustomerId, CustomerName) 
   select 1, '1', 1, 'Name1' 
     union all
   select 2, '2', 2, 'Name2'

类：

public class Document
{
    public int Id { get; set; }
    public string SomeText { get; set; }
    public Customer { get; set; }
}

public class Customer
{
    public int Id { get; set; }
    public string Name { get; set; }
}

我怎样才能得到所有文档与客户与精致小巧的？这给我的所有文件，但客户为空（当然）：

How can I get all Documents with their Customers with Dapper? This gives me all documents, but the customer is null (of course):

connection.Query<Document>("select Id, SomeText, CustomerId, CustomerName from Documents")...

编辑 - 相似，但更先进的制图问题：

EDIT - similar, but more advanced mapping question: Dapper intermediate mapping

推荐答案

项目页面（见多Mapping部分）

Example taken from dapper project page (see the Multi Mapping section):

var sql = 
@"select * from #Posts p 
left join #Users u on u.Id = p.OwnerId 
Order by p.Id";

var data = connection.Query<Post, User, Post>(sql, (post, user) => { post.Owner = user; return post;});
var post = data.First();

post.Content.IsEqualTo("Sams Post1");
post.Id.IsEqualTo(1);
post.Owner.Name.IsEqualTo("Sam");
post.Owner.Id.IsEqualTo(99);

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