这是编译器从以下查询表达式生成的代码吗? [英] Is this the code the compiler generates from the following query expression?

问题描述

     var result = from c1 in a1
                  from c2 in a1.a2
                  from c3 in a1.a2.a3
                  select new { c1.id, c2.id, c3.id };

这是编译器根据上面的查询表达式生成的代码:

Is this the code the compiler generates from the above query expression:

var result = a1.SelectMany(
      c1 => a1.a2.SelectMany(
         c2 => a1.a2.a3.Select(
            c3 => new {c1,c2,c3})));

谢谢

推荐答案

您是正确的.

这是一个完整的外部联接，将包含 a1.Count * a2.Count * a3.Count 个项目，包括源序列中每个项目的组合/

This is a full outer join and will contain a1.Count * a2.Count * a3.Count items, including every combination of items from the source sequences/

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