CODEWITHSUNDEEP
c#linq
Ben
Ben

Reputation: 383

C# Custom Linq Provider

I'm developing a custom linq provider following the very helpful article found at https://msdn.microsoft.com/en-us/library/bb546158.aspx

However, I'm getting stuck when it comes to the 'Not' operator. For example, I am testing with the condition !a.Name.Equals("2 Test"). This translates to the lambda expression {Not(a.Name.Equals("2 Test"))}.

When I call ExpressionVisitor.Visit(expression), on this expression, my VisitMethodCall override is called. However, the MethodCallExpression parameter received by that call is missing the Not part of the expression, ie: {a.Name.Equals("2 Test")}.

No other overrides are called (I have overriden all that are available). This seems to make it impossible to handle the Not part of the expression - however I'm sure that this cannot be the case!

Can anyone shed any light on this for me? AHA, Ben :)

Upvotes: 2

Views: 681

Answers (1)

cynic
cynic

Reputation: 5415

That's because Not is an unary expression and so the VisitUnary method is called first.

Upvotes: 4

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