SearchFilters

using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;

namespace ConsoleApplication1 {
	class Program {
		static void Main(string[] args) {
			int? minValue = 5;
			int? maxValue = 17;
			string stringValue = "odd";

			var searcher = new Search<SearchObject>(GenerateSearchObjects().AsQueryable());
			searcher.RangeFilter(minValue, maxValue, s => s.Somevalue);
			searcher.StringFilter(stringValue, s => s.Description);
			foreach (var result in searcher._set) {
				Console.WriteLine("{0} - {1}", result.Somevalue, result.Description);
			}
		}

		static IEnumerable<SearchObject> GenerateSearchObjects() {
			for (int i = 0; i < 20; i++) {
				yield return new SearchObject() { Somevalue = i, Description = i % 2 == 0 ? "This one is even!" : "This one is odd!" };
			}
		}
	}

	public class Search<T> {
		public IQueryable<T> _set { get; private set; }

		public Search(IQueryable<T> set) { _set = set; }

		public void RangeFilter(int? minValue, int? maxValue, Expression<Func<T, int>> property) {
			if (minValue.HasValue) {
				_set = _set.Where(s => (int)typeof(T).GetProperties().Single(p => p.Name == ((MemberExpression)property.Body).Member.Name).GetValue(s, null) >= minValue.Value);
			}
			if (maxValue.HasValue) {
				_set = _set.Where(s => (int)typeof(T).GetProperties().Single(p => p.Name == ((MemberExpression)property.Body).Member.Name).GetValue(s, null) <= maxValue.Value);
			}
		}

		public void StringFilter(string value, Expression<Func<T, string>> property) {
			_set = _set.Where(s => ((string)typeof(T).GetProperties().Single(p => p.Name == ((MemberExpression)property.Body).Member.Name).GetValue(s, null)).Contains(value));
		}
	}

	public class SearchObject {
		public int Somevalue { get; set; }
		public string Description { get; set; }
	}
}