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並前往https://supportcenter.devexpress.com/ticket/details/q400250/linq-to-xpo-invalidcastexception-when-trying-to-use-two-group-joins-in-visual-basic

LINQ to XPO - InvalidCastException when trying to use two ...

Hello, when executing this LINQ to XPO statement Dim result2 = From p1 In payment1Query Group Join p2 In payment2Query On p1.Oid Equals p2.

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