PackageType.cs

using System;
using System.Collections.Generic;

namespace ProjectFileTools.NuGetSearch.Contracts
{
    public class PackageType : IEquatable<PackageType>
    {
        public static IReadOnlyList<PackageType> DefaultList { get; } = new[] { KnownPackageType.Dependency };

        public PackageType(string id, string version = null)
        {
            Name = id ?? throw new ArgumentNullException(nameof(id));
            Version = version;
        }
        public string Name { get; }
        public string Version { get; }


        public override bool Equals(object obj) => Equals(obj as PackageType);

        public bool Equals(PackageType other) => other is PackageType
            && string.Equals(Name, other.Name, StringComparison.Ordinal)
            && string.Equals(Version, other.Version, StringComparison.Ordinal);

        public override int GetHashCode()
        {
            int hashCode = -612338121;
            hashCode = hashCode * -1521134295 + StringComparer.Ordinal.GetHashCode(Name);
			if (Version is not null) {
				hashCode = hashCode * -1521134295 + StringComparer.Ordinal.GetHashCode(Version);
			}
            return hashCode;
        }
    }

    public class KnownPackageType
    {
        public static PackageType Legacy { get; } = new PackageType("Legacy");
        public static PackageType DotnetCliTool { get; } = new PackageType("DotnetCliTool");
        public static PackageType Dependency { get; } = new PackageType("Dependency");
        public static PackageType DotnetTool { get; } = new PackageType("DotnetTool");
        public static PackageType SymbolsPackage { get; } = new PackageType("SymbolsPackage");
        public static PackageType DotnetPlatform { get; } = new PackageType("DotnetPlatform");
        public static PackageType MSBuildSdk { get; } = new PackageType("MSBuildSdk");
    }
}