string comparison tests

sctest.console.cs

/*
Faster (probably due to no debugging attached by roslyn/linqpad), but same results overall
ICIC - 2.0579534
ToLower - 3.2817216
ToUpper - 3.2320578
ToLowerInvariant - 2.7057271
ToUpperInvariant - 2.7467674
*/

using System;

namespace Benchmark
{
    class Program
    {
        static void Main(string[] args)
        {
            var sw = new System.Diagnostics.Stopwatch();
            sw.Start();
            for (int i = 0; i < 10000000; i++)
            {
                var valid = string.Equals(("test" + i), "test", StringComparison.InvariantCultureIgnoreCase);
            }
            "ICIC".Dump();
            sw.Elapsed.TotalSeconds.Dump();
            sw.Reset();
            sw.Start();
            for (int i = 0; i < 10000000; i++)
            {
                var valid = ("test" + i).ToLower() == "test".ToLower();
            }
            "ToLower".Dump();
            sw.Elapsed.TotalSeconds.Dump();
            sw.Reset();
            sw.Start();
            for (int i = 0; i < 10000000; i++)
            {
                var valid = ("test" + i).ToUpper() == "test".ToUpper();
            }
            "ToUpper".Dump();
            sw.Elapsed.TotalSeconds.Dump();
            sw.Reset();
            sw.Start();
            for (int i = 0; i < 10000000; i++)
            {
                var valid = ("test" + i).ToLowerInvariant() == "test".ToLowerInvariant();
            }
            "ToLowerInvariant".Dump();
            sw.Elapsed.TotalSeconds.Dump();
            sw.Reset();
            sw.Start();
            for (int i = 0; i < 10000000; i++)
            {
                var valid = ("test" + i).ToUpperInvariant() == "test".ToUpperInvariant();
            }
            "ToUpperInvariant".Dump();
            sw.Elapsed.TotalSeconds.Dump();

            Console.ReadLine();
        }
    }

    public static class Ext
    {
        public static void Dump(this object obj)
        {
            Console.WriteLine(obj.ToString());
        }
    }
}

sctest.roslynpad.cs

/*
Optimisations Off -
    Run 1 -
        ICIC - 2.3968469
        ToLower - 4.068176
        ToUpper - 4.1186162
        ToLowerInvariant - 3.0551849
        ToUpperInvariant - 3.0872983
    Run 2 -
        ICIC - 2.4894112
        ToLower - 3.9751046
        ToUpper - 3.8831133
        ToLowerInvariant - 2.9753864
        ToUpperInvariant - 2.9298081
    Run 3 -
        ICIC - 2.3738692
        ToLower - 3.965096
        ToUpper - 3.9167838
        ToLowerInvariant - 3.0479106
        ToUpperInvariant - 3.1812765
Optimisations On - 
    Run 1 -
        ICIC - 2.3813724
        ToLower - 3.8624087
        ToUpper - 3.7243602
        ToLowerInvariant - 2.7946187
        ToUpperInvariant - 2.7731418
    Run 2 -
        ICIC - 2.3676069
        ToLower - 3.7968581
        ToUpper - 3.7123926
        ToLowerInvariant - 2.7868444
        ToUpperInvariant - 2.7985568
    Run 3 -
        ICIC - 2.3024725
        ToLower - 3.7179663
        ToUpper - 3.6960497
        ToLowerInvariant - 2.7884367
        ToUpperInvariant - 2.7717545
*/


var sw = new System.Diagnostics.Stopwatch();
sw.Start();
for(int i = 0; i < 10000000; i++)
{
    var valid = string.Equals(("test" + i), "test", StringComparison.InvariantCultureIgnoreCase);
}
"ICIC".Dump();
sw.Elapsed.TotalSeconds.Dump();
sw.Reset();
sw.Start();
for(int i = 0; i < 10000000; i++)
{
    var valid = ("test" + i).ToLower() == "test".ToLower();
}
"ToLower".Dump();
sw.Elapsed.TotalSeconds.Dump();
sw.Reset();
sw.Start();
for(int i = 0; i < 10000000; i++)
{
    var valid = ("test" + i).ToUpper() == "test".ToUpper();
}
"ToUpper".Dump();
sw.Elapsed.TotalSeconds.Dump();
sw.Reset();
sw.Start();
for(int i = 0; i < 10000000; i++)
{
    var valid = ("test" + i).ToLowerInvariant() == "test".ToLowerInvariant();
}
"ToLowerInvariant".Dump();
sw.Elapsed.TotalSeconds.Dump();
sw.Reset();
sw.Start();
for(int i = 0; i < 10000000; i++)
{
    var valid = ("test" + i).ToUpperInvariant() == "test".ToUpperInvariant();
}
"ToUpperInvariant".Dump();
sw.Elapsed.TotalSeconds.Dump();

// .equals 00:00:02.3217525 vs == 00:00:03.8858363