score:0
Usually for joins and especially for left joins I use statement syntax.
Not tested, but would look something like this:
var result = from a in tableA
from b in tableB.Where(x => x.col1 == a.col1 && x.col2 == a.col2 && a.col3 == 1).DefaultIfEmpty()
select new { a.col1, a.col2, b.col3 };
By doing a .DefaultIfEmpty() on the join from tableB, it will treat this as a left join. If you leave out the .DefaultIfEmpty() then it will behave like an inner join.
score:0
You can find an extension that facilitates left joins with Dynamic Linq on GitHub: https://github.com/SikeyMael/LinqHelper
Source: stackoverflow.com
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