Add ignore case parameter for TryParseFast

[dameng324]

Enum.TryParse has two overloads which are:

public static bool TryParse<TEnum>(ReadOnlySpan<char> value, out TEnum result)
public static bool TryParse<TEnum>([NotNullWhen(true)] string? value, bool ignoreCase, out TEnum result)

so I add the ignoreCase overload.

Generated:

/// <summary>
/// Try parse a string to <see cref="global::UnitTests.UserTypeTest" /> value.
/// </summary>
/// <param name="states">The string representing a <see cref="global::UnitTests.UserTypeTest" /> value.</param>
/// <param name="ignoreCase">true to ignore case; false to consider case.</param>
/// <param name="result">The enum <see cref="global::UnitTests.UserTypeTest" /> parse result.</param>
/// <returns>True if the string is parsed successfully; otherwise, false.</returns>
public static bool TryParseFast(string states, bool ignoreCase, out UnitTests.UserTypeTest result)
{
    if (string.Equals(states, "Men", ignoreCase ? StringComparison.OrdinalIgnoreCase : StringComparison.Ordinal))
    {
        result = UnitTests.UserTypeTest.Men;
        return true;
    }
    if (string.Equals(states, "Women", ignoreCase ? StringComparison.OrdinalIgnoreCase : StringComparison.Ordinal))
    {
        result = UnitTests.UserTypeTest.Women;
        return true;
    }
    if (string.Equals(states, "None", ignoreCase ? StringComparison.OrdinalIgnoreCase : StringComparison.Ordinal))
    {
        result = UnitTests.UserTypeTest.None;
        return true;
    }

    result = default;
    return false;
}

BenchMark Result

// * Summary *

BenchmarkDotNet v0.13.12, Windows 11 (10.0.22621.3296/22H2/2022Update/SunValley2)
AMD Ryzen 7 5800X, 1 CPU, 16 logical and 8 physical cores
.NET SDK 8.0.203
  [Host]     : .NET 8.0.3 (8.0.324.11423), X64 RyuJIT AVX2
  Job-SEFBGQ : .NET 8.0.3 (8.0.324.11423), X64 RyuJIT AVX2

Runtime=.NET 8.0  InvocationCount=64  IterationCount=32
IterationTime=120.0000 s  LaunchCount=1  WarmupCount=6

| Method                   | Mean         | Error       | StdDev      | Median       | Op/s          | Rank | Allocated |
|------------------------- |-------------:|------------:|------------:|-------------:|--------------:|-----:|----------:|
| FastToDisplay            |     1.451 ns |   0.2857 ns |   0.4098 ns |     1.562 ns | 689,230,769.2 |    1 |       6 B |
| FastGetLength            |     1.562 ns |   0.0000 ns |   0.0000 ns |     1.562 ns | 640,000,000.0 |    1 |       6 B |
| FastIsDefined            |     2.571 ns |   0.4976 ns |   0.7600 ns |     3.125 ns | 389,019,607.8 |    2 |       6 B |
| FastToDescription        |     2.894 ns |   0.4035 ns |   0.5656 ns |     3.125 ns | 345,600,000.0 |    2 |       6 B |
| FasterToString           |     3.027 ns |   0.5664 ns |   0.8819 ns |     2.344 ns | 330,322,580.6 |    2 |       6 B |
| FastTryParse             |     6.062 ns |   0.3882 ns |   0.5182 ns |     6.250 ns | 164,948,453.6 |    3 |       6 B |
| FastGetValues            |    10.104 ns |   0.9783 ns |   1.4642 ns |    10.156 ns |  98,969,072.2 |    4 |      46 B |
+| FastTryParseIgnoreCase   |    12.109 ns |   0.4804 ns |   0.6890 ns |    12.500 ns |  82,580,645.2 |    5 |       6 B |
| FastGetNames             |    15.904 ns |   1.1505 ns |   1.6500 ns |    15.625 ns |  62,877,193.0 |    6 |      54 B |
| NativeToString           |    96.562 ns |   4.3554 ns |   6.5190 ns |    96.875 ns |  10,355,987.1 |    7 |      36 B |
+| NativeTryParseIgnoreCase |   106.250 ns |   3.9949 ns |   5.6002 ns |   104.688 ns |   9,411,764.7 |    8 |      12 B |
| NativeTryParse           |   109.375 ns |   2.2716 ns |   3.1845 ns |   109.375 ns |   9,142,857.1 |    9 |      12 B |
| NativeGetLength          |   110.990 ns |   1.2101 ns |   1.8112 ns |   110.938 ns |   9,009,854.5 |   10 |      60 B |
| NativeGetNames           |   111.169 ns |   3.7058 ns |   5.1950 ns |   109.375 ns |   8,995,314.9 |   10 |      60 B |
| NativeIsDefined          |   118.103 ns |   3.4602 ns |   5.0720 ns |   118.750 ns |   8,467,153.3 |   11 |      36 B |
| NativeGetValues          |   157.701 ns |   2.1161 ns |   3.0348 ns |   156.250 ns |   6,341,118.2 |   12 |      50 B |
| NativeToDescription      | 5,427.121 ns | 163.6793 ns | 234.7440 ns | 5,398.438 ns |     184,259.8 |   13 |     752 B |
| NativeToDisplay          | 5,473.785 ns | 187.0457 ns | 262.2120 ns | 5,426.562 ns |     182,689.0 |   13 |     752 B |