當麻許的超技八

static List<User> sampleUsers = new List<User>();

protected void Page_Load(object sender, EventArgs e)
{
    if (sampleUsers.Count == 0)
    {
        for (int i = 1; i <= 1000000; i++)
        {
            sampleUsers.Add( new User { Name = "User" + i });
        }
    }

    TestLib.Search<User> search = new Search<User>();
    
    Stopwatch sw = new Stopwatch();
    sw.Start();
    
    //搜尋Name 此屬性是否帶有ER5 這字詞
    var res = search.SearchListPropertyValue(sampleUsers, "Name", "ER5");

    sw.Stop();
    Response.Write("搜尋到筆數為 " + res.Count() + ",耗時：" + sw.Elapsed + "<br />");

}

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

namespace TestLib
{
    public class Search<T>
    {
        /// <summary>
        /// 搜尋是否物件某屬性中是否帶有某關鍵字
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="lists"></param>
        /// <param name="propertyName">屬性名</param>
        /// <param name="propertyValue">是否包含某關鍵字</param>
        /// <returns></returns>
        public T[] SearchListPropertyValue<T>(List<T> lists, string propertyName, string propertyValue)
        {
            List<T> re = new List<T>();

            return
                lists.Where(
                    x => x.GetType().GetProperty(propertyName).GetValue(x, null).ToString().IndexOf(propertyValue, StringComparison.OrdinalIgnoreCase) >= 0).
                    ToArray();

            //foreach (var obj in lists)
            //{
            //    if(obj.GetType().GetProperty(propertyName).GetValue(obj, null).ToString().IndexOf(propertyValue,StringComparison.OrdinalIgnoreCase)>=0)
            //    {
            //        re.Add(obj);
            //    }
            //}

            //return re.ToArray();
        }
    }
}