Question

I have a method that takes an IQueryable. Is there a LINQ query that will give me back the size of each column in the IQueryable?

To be more clear: this is Linq-to-objects. I want to get the length of the ToString() of each ‘column’.

Answer 1

It depends. If you mean is there a completely generic way to make this determination the answer is no. All IQueryable will give access to is the Type of each expression. There is no way to arbitrarily map a Type to a column size.

If on the other hand you have the ability to map a Type to members and member type to a column size then yes there is a way to get the size.

 public IEnumerable GetColumnSize(IQueryable source) {   var types = MapTypeToMembers(source).Select(x => x.Type);   return types.Select(x => MapTypeToSize(x)); }