c# - Translating query comprehension to Enumerable extension methods in LINQ -


how translate following query functional calls? know compiler behind scenes don't know how view result 

        var query = item in enumerable.range(0, 10)                     item2 in enumerable.range(item, 10)                     item3 in enumerable.range(item2, 10)                     select new { item, item2, item3 };

in case, uses selectmany, , concept called transparent identifiers preserve existing range variables. query translate to:

var query = enumerable.range(0, 10)                       .selectmany(item => enumerable.range(item, 10),                                   (item, item2) => new { item, item2 })                       .selectmany(z => enumerable.range(z.item2, 10),                                   (z, item3) => new { z.item, z.item2, item3 });

(in case z transparent identifier. if there'd been where clause or other select after last from clause, transparent identifier have been introduced.)

the translations described in c# language specification, section 7.16.


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