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並前往https://www.telerik.com/forums/linq-query-with-outer-join-group-by-return-object-reference-not-set-to-an-instance-of-an-object-but-works-perfectly-in-linqpad

Linq Query with Outer Join & Group By return "Object ... - Telerik

Linq Query with Outer Join & Group By return "Object reference not set to an instance of an object." but works perfectly in LINQPad.

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