Nullable filters in XRM where clause
问题 I'm using the XRM (early bound) types in a WCF project so I have access to the CRM model and can use LINQ queries. But I've been running into a problem described here, it's the limitations on the where clause specific to XRM LINQ: where [clause limitations] The left side of the clause must be an attribute name and the right side of the clause must be a value. You cannot set the left side to a constant. Both the sides of the clause cannot be constants. Supports the String functions Contains,