DataTable和普通类型存储数据,内存和效率的差别

测试了一下普通的dt和类型的速度差异, 下面是代码:

     public class MrInfo
    {
        public int versionid { get; set; }
        public string MCellId { get; set; }
        public int NCell_Bcch { get; set; }
        public int NCell_Bsic { get; set; }
        public double RMS0 { get; set; }
        public double RMS1 { get; set; }
        public double RMS2 { get; set; }
        public double RMS3 { get; set; }
        public double RMS4 { get; set; }
        public double RMS5 { get; set; }
        public double RMS6 { get; set; }
        public double RMS7 { get; set; }
        public double RMS8 { get; set; }
        public double RMS9 { get; set; }
        public double Total { get; set; }
        public DateTime CollectTime { get; set; }
    }

    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(DateTime.Now);
            //TestNullableInt();
            //List<MrInfo> lstMr = TastClass();
            //DataTable dt = TestDataTable();
            Console.WriteLine();
            Console.WriteLine(DateTime.Now);
            Console.WriteLine("==OVER==");
            Console.ReadLine();
        }

        private static void TestNullableInt()
        {
            int i = 100;
            int j = 50;
            Console.WriteLine("i:{0},j:{1}", i, j);
            TestInt(i, ref j);
            Console.WriteLine("TestInt(int i, ref int j) i:{0},j:{1}", i, j);
            int? ni = 100;
            int? nj = 50;
            Console.WriteLine("ni:{0},nj:{1}", ni.Value, nj.Value);
            TestNullInt(ni, ref nj);
            Console.WriteLine("TestNullInt(int? i, ref int? j) i:{0},j:{1}", ni.Value, nj.Value);
        }

        static void TestInt(int i, ref int j)
        {
            i++;
            j++;
        }

        static void TestNullInt(int? i, ref int? j)
        {
            i = i.Value + 1;
            j = j.Value + 1;
        }

        static List<MrInfo> TastClass()
        {
            List<MrInfo> lstInfo = new List<MrInfo>();
            for (int i = 0; i <= 4000000; i++)
            {
                MrInfo mr = new MrInfo()
                {
                    CollectTime = DateTime.Now,
                    MCellId = "460-00-11111-" + i.ToString("00000"),
                    NCell_Bcch = 6,
                    NCell_Bsic = 7,
                    RMS0 = 0,
                    RMS1 = 1,
                    RMS2 = 2,
                    RMS3 = 3,
                    RMS4 = 4,
                    RMS5 = 5,
                    RMS6 = 6,
                    RMS7 = 7,
                    RMS8 = 8,
                    RMS9 = 9,
                    Total = 10,
                    versionid = 1
                };
                lstInfo.Add(mr);
                if (i % 100000 == 0)
                    Console.Write("^");
            }
            return lstInfo;
        }

        static DataTable TestDataTable()
        {
            DataTable dt = GetMRTableSchema();
            for (int i = 0; i <= 3000000; i++)
            {
                DataRow dr = dt.NewRow();
                dr[0] = 1;
                dr[1] = "460-00-11111-" + i.ToString("00000");
                dr[2] = 6;
                dr[3] = 7;
                for (int j = 0; j < 11; j++)
                {
                    dr[4 + j] = j;
                }
                dr["CollectTime"] = DateTime.Now;
                dt.Rows.Add(dr);
                if (i % 100000 == 0)
                    Console.Write("^");
            }
            return dt;
        }

        static DataTable GetMRTableSchema()
        {
            DataTable mrDataTable = new DataTable();
            mrDataTable.Columns.Add("versionid", typeof(Int32));
            mrDataTable.Columns.Add("MCellId", typeof(String));
            mrDataTable.Columns.Add("NCell_Bcch", typeof(Int32));
            mrDataTable.Columns.Add("NCell_Bsic", typeof(Int32));
            mrDataTable.Columns.Add("RMS0", typeof(double));
            mrDataTable.Columns.Add("RMS1", typeof(double));
            mrDataTable.Columns.Add("RMS2", typeof(double));
            mrDataTable.Columns.Add("RMS3", typeof(double));
            mrDataTable.Columns.Add("RMS4", typeof(double));
            mrDataTable.Columns.Add("RMS5", typeof(double));
            mrDataTable.Columns.Add("RMS6", typeof(double));
            mrDataTable.Columns.Add("RMS7", typeof(double));
            mrDataTable.Columns.Add("RMS8", typeof(double));
            mrDataTable.Columns.Add("RMS9", typeof(double));
            mrDataTable.Columns.Add("Total", typeof(double));
            mrDataTable.Columns.Add("CollectTime", Type.GetType("System.DateTime"));
            return mrDataTable;
        }
    }
 
及时结果差异巨大:
第一列是内存(M)第二列是执行时间(S)
 
DT
 
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Class
 
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