Get all 'where' calls using ExpressionVisitor

Question

I have a query, like such:

var query = from sessions in dataSet
                    where (names.Contains(sessions.Username))
                    where (sess         


        

Answer 1

Use the class found here http://msdn.microsoft.com/en-us/library/bb882521%28v=vs.90%29.aspx as your base. You can then create your Visitor like this

internal class WhereFinder : ExpressionVisitor
    {
        private IList<MethodCallExpression> whereExpressions = new List<MethodCallExpression>();

        public IList<MethodCallExpression> GetWhere(Expression expression)
        {
            Visit(expression); 
            return whereExpressions;
        }

        protected override Expression VisitMethodCall(MethodCallExpression expression)
        {
            if (expression.Method.Name == "Where")
                whereExpressions.Add(expression);

            Visit(expression.Arguments[0]);

            return expression;
        }
    }