public static T ParseIt<T>(string content, IFormatProvider? provider) where T : IParsable<T>
{
   return T.Parse(content, provider);
}

public IEnumerable<T> ParseCsvRow<T>(string content, IFormatProvider? provider) where T : IParsable<T>
{
   return content.Split(',').Select(str => T.Parse(str, provider));
}

public static T ParseIt<T>(string content, IFormatProvider? provider)
{
   var type = typeof(T);
   var method = type.GetMethod("Parse", BindingFlags.Static | BindingFlags.Public,
     new[] { typeof(string), typeof(IFormatProvider) });
   return (T)method!.Invoke(null, new object?[] { content, provider })!;
}

using System.ComponentModel.DataAnnotations;

namespace NotifyPropertyChangedGenerator.Demo;

public enum Gender
{
    NotSpecified,
    [Display(Name = "مرد")] Male,
    [Display(Name = "زن")] Female
}

public static class Extensions
{
    public static string GetDisplayName(this Enum value)
    {
        if (value is null)
            throw new ArgumentNullException(nameof(value));

        var attribute = value.GetType().GetField(value.ToString())?
            .GetCustomAttributes<DisplayAttribute>(false).FirstOrDefault();

        if (attribute is null)
            return value.ToString();

        return attribute.GetType().GetProperty("Name")?.GetValue(attribute, null)?.ToString();
    }
}

namespace NotifyPropertyChangedGenerator.Demo
{
  public static class GenderExtensions
  {
      public static string GetDisplayName(this Gender @enum)
      {
          return @enum switch
            {
                Gender.NotSpecified => "NotSpecified",
                Gender.Male => "مرد",
                Gender.Female => "زن",
                _ => throw new ArgumentOutOfRangeException(nameof(@enum))
            };
      }
  }
}

[Generator]
public class EnumExtensionsGenerator : ISourceGenerator
{
    public void Initialize(GeneratorInitializationContext context)
    {}

    public void Execute(GeneratorExecutionContext context)
    {
        var compilation = context.Compilation;
        foreach (var syntaxTree in compilation.SyntaxTrees)
        {
            var semanticModel = compilation.GetSemanticModel(syntaxTree);
            var immutableHashSet = syntaxTree.GetRoot()
                .DescendantNodesAndSelf()
                .OfType<EnumDeclarationSyntax>()
                .Select(enumDeclarationSyntax => semanticModel.GetDeclaredSymbol(enumDeclarationSyntax))
                .OfType<ITypeSymbol>()
                /*.Where(typeSymbol => typeSymbol.GetAttributes().Any(
                    attributeData => string.Equals(attributeData.AttributeClass?.Name, "GenerateExtensions",
                        StringComparison.Ordinal)
                ))*/
                .ToImmutableHashSet();

            foreach (var typeSymbol in immutableHashSet)
            {
                var source = GenerateEnumExtensions(typeSymbol);
                context.AddSource($"{typeSymbol.Name}Extensions.cs", source);
            }
        }
    }

    private string GenerateEnumExtensions(ITypeSymbol typeSymbol)
    {
        return $@"namespace {typeSymbol.ContainingNamespace}
{{
  public static class {typeSymbol.Name}Extensions
  {{
      public static string GetDisplayName(this {typeSymbol.Name} @enum)
      {{
          {GenerateExtensionMethodBody(typeSymbol)}
      }}
  }}
}}";
    }

    private static string GenerateExtensionMethodBody(ITypeSymbol typeSymbol)
    {
        var sb = new StringBuilder();
        sb.Append(@"return @enum switch
            {
");

        foreach (var fieldSymbol in typeSymbol.GetMembers().OfType<IFieldSymbol>())
        {
            var displayAttribute = fieldSymbol.GetAttributes()
                .FirstOrDefault(attributeData =>
                    string.Equals(attributeData.AttributeClass?.Name, "DisplayAttribute", StringComparison.Ordinal));
            if (displayAttribute is null)
            {                
                sb.AppendLine(
                    $@"                {typeSymbol.Name}.{fieldSymbol.Name} => ""{fieldSymbol.Name}"",");
            }
            else
            {
                var displayAttributeName = displayAttribute.NamedArguments
                    .FirstOrDefault(x => string.Equals(x.Key, "Name", StringComparison.Ordinal))
                    .Value;
                sb.AppendLine(
                    $@"                {typeSymbol.Name}.{fieldSymbol.Name} => ""{displayAttributeName.Value}"",");
            }
        }

        sb.Append(
            @"                _ => throw new ArgumentOutOfRangeException(nameof(@enum))
            };");

        return sb.ToString();
    }

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net6.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>

    <EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>
    <CompilerGeneratedFilesOutputPath>Generated</CompilerGeneratedFilesOutputPath>
  </PropertyGroup>
  
  <Target Name="CleanSourceGeneratedFiles" BeforeTargets="BeforeBuild" DependsOnTargets="$(BeforeBuildDependsOn)">
    <RemoveDir Directories="$(CompilerGeneratedFilesOutputPath)" />
  </Target>  
  <ItemGroup>
    <!-- Exclude the output of source generators from the compilation -->
    <Compile Remove="$(CompilerGeneratedFilesOutputPath)/**/*.cs" />
<Content Include="$(CompilerGeneratedFilesOutputPath)/**" />
  </ItemGroup>

  <ItemGroup>
    <ProjectReference Include="..\NotifyPropertyChangedGenerator\NotifyPropertyChangedGenerator.csproj" 
OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
  </ItemGroup>
</Project>

{BaseIntermediateOutpath}/generated/{Assembly}/{SourceGeneratorName}/{GeneratedFile}

    /* Strict Type-Checking Options */
    "strict": true,                           /* Enable all strict type-checking options. */
    // "noImplicitAny": true,                 /* Raise error on expressions and declarations with an implied 'any' type. */
    // "strictNullChecks": true,              /* Enable strict null checks. */
    // "strictFunctionTypes": true,           /* Enable strict checking of function types. */
    // "strictPropertyInitialization": true,  /* Enable strict checking of property initialization in classes. */
    // "noImplicitThis": true,                /* Raise error on 'this' expressions with an implied 'any' type. */
    // "alwaysStrict": true,                  /* Parse in strict mode and emit "use strict" for each source file. */

    /* Additional Checks */
    // "noUnusedLocals": true,                /* Report errors on unused locals. */
    // "noUnusedParameters": true,            /* Report errors on unused parameters. */
    // "noImplicitReturns": true,             /* Report error when not all code paths in function return a value. */
    // "noFallthroughCasesInSwitch": true,    /* Report errors for fallthrough cases in switch statement. */

[Route("[controller]")]
public class WeatherForecastController : ControllerBase
{
    private static readonly string[] Summaries =
    {
        "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy",
        "Hot", "Sweltering", "Scorching",
    };

    // /WeatherForecast/GetForecast2?from=1&to=3
    [HttpGet("[action]")]
    public IEnumerable<WeatherForecast> GetForecast2(Duration days)
    {
        return Enumerable.Range(days.From, days.To)
                         .Select(index => new WeatherForecast
                                          {
                                              Date = DateOnly.FromDateTime(DateTime.Now.AddDays(index)),
                                              TemperatureC = Random.Shared.Next(-20, 55),
                                              Summary = Summaries[Random.Shared.Next(Summaries.Length)],
                                          })
                         .ToArray();
    }
}

public class Duration
{
    public int From { get; set; }
    public int To { get; set; }
}

public class WeatherForecast
{
    public DateOnly Date { get; set; }

    public int TemperatureC { get; set; }

    public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);

    public string? Summary { get; set; }
}

// /WeatherForecast/GetForecast3/1-3
[HttpGet("[action]/{days}")]
public IEnumerable<WeatherForecast> GetForecast3(Days days)
    {
        return Enumerable.Range(days.From, days.To)
                         .Select(index => new WeatherForecast
                                          {
                                              Date = DateOnly.FromDateTime(DateTime.Now.AddDays(index)),
                                              TemperatureC = Random.Shared.Next(-20, 55),
                                              Summary = Summaries[Random.Shared.Next(Summaries.Length)],
                                          })
                         .ToArray();
    }

using System.Diagnostics.CodeAnalysis;
using System.Globalization;

namespace NET7Mvc.Models;

public class Days : IParsable<Days>
{
    public Days(int from, int to)
    {
        From = from;
        To = to;
    }

    public int From { get; }
    public int To { get; }

    public static bool TryParse([NotNullWhen(true)] string? value,
                                IFormatProvider? provider,
                                [MaybeNullWhen(false)] out Days result)
    {
        var items = value?.Split('-', StringSplitOptions.RemoveEmptyEntries);
        if (items is { Length: 2 })
        {
            if (int.TryParse(items[0], NumberStyles.None, provider, out var from)
                && int.TryParse(items[1], NumberStyles.None, provider, out var to))
            {
                result = new Days(from, to);
                return true;
            }
        }

        result = default;
        return false;
    }

    public static Days Parse(string value, IFormatProvider? provider)
    {
        if (!TryParse(value, provider, out var result))
        {
            throw new ArgumentException("Could not parse the given value.", nameof(value));
        }

        return result;
    }
}