Performance analysis: Use SPList.ItemCount instead of SPList.Items.Count

Here is the code that can measure performance between two:

   1:  Stopwatch sw = new Stopwatch();

   2:   

   3:              using (SPSite site = new SPSite("http://site/"))

   4:              {

   5:                  using (SPWeb web = site.OpenWeb())

   6:                  {

   7:                      SPList list = web.GetList("/Lists/list");

   8:                      long totalMemory = 0;

   9:                      long totalCollectionCount = 0;

  10:                      Console.WriteLine("Good test");

  11:                      totalMemory = GC.GetTotalMemory(false);

  12:                      totalCollectionCount = GC.CollectionCount(0);

  13:                      sw.Start();

  14:                      Console.WriteLine("item count:{0} ", list.ItemCount);

  15:                      sw.Stop();

  16:                      Console.WriteLine("Total time taken:{0}", sw.Elapsed);

  17:                      Console.WriteLine("TotalMemory:{0}", GC.GetTotalMemory(false) - totalMemory);

  18:                      Console.WriteLine("CollectionCount:{0}", GC.CollectionCount(0) - totalCollectionCount);

  19:   

  20:                      GC.Collect();

  21:   

  22:                      Console.WriteLine("\nBadTest");

  23:                      totalMemory = GC.GetTotalMemory(false);

  24:                      totalCollectionCount = GC.CollectionCount(0);

  25:                      sw.Start();

  26:                      Console.WriteLine("item count:{0} ", list.Items.Count);

  27:                      sw.Stop();

  28:                      Console.WriteLine("Total time taken:{0}", sw.Elapsed);

  29:                      Console.WriteLine("TotalMemory:{0}", GC.GetTotalMemory(false) - totalMemory);

  30:                      Console.WriteLine("CollectionCount:{0}", GC.CollectionCount(0) - totalCollectionCount);

  31:   

  32:                      Console.WriteLine("Press Any key to exit...");

  33:                      Console.ReadKey();

  34:                  }

  35:              }

Results of your testing will depend upon items in list for Items.Count but it will be constant for Items.ItemCount

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