Question

I want to use ObjectParameter inside a LINQ query in the following way:

var query = systemEntities.Clients.Where("it.age > @a", new ObjectParameter("a", 20));

Then, I want to add another N where clauses to the same query like this:

var query = query.Where("it.age < @b", new ObjectParameter("b", 20));

Can i use the same ObjectParameter’s name multiple times like this?

var query = systemEntities.Clients.Where("it.age > @a", new ObjectParameter("a", 20));

var query = query.Where("it.age < @a", new ObjectParameter("a", 20));

Answer 1

The answer to your question is no. From http://msdn.microsoft.com/en-us/library/bb896238.aspx

Parameters must be unique in the
ObjectParameterCollection. There
cannot be two parameters in the
collection with the same name.