packages/System.Linq.Dynamic.Core.1.0.7.13/src/System.Linq.Dynamic.Core/DynamicQueryableExtensions.cs

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using System.Collections.Generic;
using System.Collections;
using System.Globalization;
using System.Linq.Dynamic.Core.Exceptions;
#if !(WINDOWS_APP45x || SILVERLIGHT)
using System.Diagnostics;
#endif
using System.Linq.Dynamic.Core.Extensions;
using System.Linq.Dynamic.Core.Validation;
using System.Linq.Expressions;
using System.Reflection;
using JetBrains.Annotations;
#if WINDOWS_APP
using System;
using System.Linq;
#endif

namespace System.Linq.Dynamic.Core
{
    /// <summary>
    /// Provides a set of static (Shared in Visual Basic) methods for querying data structures that implement <see cref="IQueryable"/>.
    /// It allows dynamic string based querying. Very handy when, at compile time, you don't know the type of queries that will be generated,
    /// or when downstream components only return column names to sort and filter by.
    /// </summary>
    public static class DynamicQueryableExtensions
    {
#if !(WINDOWS_APP45x || SILVERLIGHT)
        private static readonly TraceSource TraceSource = new TraceSource(typeof(DynamicQueryableExtensions).Name);
#endif
        private static readonly Func<MethodInfo, bool> PredicateParameterHas2 = mi => mi.GetParameters()[1].ToString().Contains("Func`2");

        private static Expression OptimizeExpression(Expression expression)
        {
            if (ExtensibilityPoint.QueryOptimizer != null)
            {
                var optimized = ExtensibilityPoint.QueryOptimizer(expression);

#if !(WINDOWS_APP45x || SILVERLIGHT)
                if (optimized != expression)
                {
                    TraceSource.TraceEvent(TraceEventType.Verbose, 0, "Expression before : {0}", expression);
                    TraceSource.TraceEvent(TraceEventType.Verbose, 0, "Expression after  : {0}", optimized);
                }
#endif
                return optimized;
            }

            return expression;
        }

        #region Aggregate
        /// <summary>
        /// Dynamically runs an aggregate function on the IQueryable.
        /// </summary>
        /// <param name="source">The IQueryable data source.</param>
        /// <param name="function">The name of the function to run. Can be Sum, Average, Min or Max.</param>
        /// <param name="member">The name of the property to aggregate over.</param>
        /// <returns>The value of the aggregate function run over the specified property.</returns>
        public static object Aggregate([NotNull] this IQueryable source, [NotNull] string function, [NotNull] string member)
        {