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並前往https://royalarun.blogspot.com/2013/08/handle-null-values-in-linq-query-c.html

Handle Null Values in Linq Query (C#) - Arunprakash's Blog

var query1 = from c in categories where c != null join p in products on c.ID equals (p == null ? null : p.CategoryID) select new { Category ...

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