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C# LINQ Left join of DataTables Join 키가 두개일경우 on new { X1 = tb1.Field("ids"), X2 = tb1.Field("tdate") } equals new { X1 = tb2.Field("ids"), X2 = tb2.Field("odate") } _____________________________________________________________________________________________________________________ var query1 = from tb1 in DT1.AsEnumerable() join tb2 in DT2.AsEnumerable() on new { X1 = tb1.Field("ids"), X2 = tb..