C# Windows 10のレジストリに登録されたAppID情報を取得するクラス

動作確認環境：C# 8（.NET Core 3.1）、9（.NET 5.0）

• レジストリからHKEY_CLASSES_ROOT\AppIDキーの情報を取得する。

C#でWindows 10のレジストリに登録されたAppID情報を取得するクラスです。レジストリから値の取得は実装していますが、取得した値の整形は実装していません。

トップレベルステートメント（C# 9）

using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Linq;
using Microsoft.Win32;

var infos = RegistryAppIDKeyInfo.GetInfos();

var infosHasAccessPermission = infos.Where(info => info.AccessPermission != null).ToArray();
var infosHasActivateAtStorage = infos.Where(info => info.ActivateAtStorage != null).ToArray();
var infosHasAppIDFlags = infos.Where(info => info.AppIDFlags != null).ToArray();
var infosHasAuthenticationLevel = infos.Where(info => info.AuthenticationLevel != null).ToArray();
var infosHasDLLSurrogate = infos.Where(info => info.DLLSurrogate != null).ToArray();
var infosHasDLLSurrogateExecutable = infos.Where(info => info.DLLSurrogateExecutable != null).ToArray();
var infosHasEndpoints = infos.Where(info => info.EndPoints != null).ToArray();
var infosHasLaunchPermission = infos.Where(info => info.LaunchPermission != null).ToArray();
var infosHasLoadUserSettings = infos.Where(info => info.LoadUserSettings != null).ToArray();
var infosHasLocalService = infos.Where(info => info.LocalService != null).ToArray();
var infosHasPreferredServerBitness = infos.Where(info => info.PreferredServerBitness != null).ToArray();
var infosHasRemoteServerName = infos.Where(info => info.RemoteServerName != null).ToArray();
var infosHasROTFlags = infos.Where(info => info.ROTFlags != null).ToArray();
var infosHasRunAs = infos.Where(info => info.RunAs != null).ToArray();
var infosHasServiceParameters = infos.Where(info => info.ServiceParameters != null).ToArray();
var infosHasSRPTrustLevel = infos.Where(info => info.SRPTrustLevel != null).ToArray();

sealed record RegistryAppIDKeyInfo
{
    public readonly Guid AppID;
    public readonly ImmutableArray<byte> AccessPermission;
    public readonly string ActivateAtStorage;
    public readonly uint? AppIDFlags;
    public readonly uint? AuthenticationLevel;
    public readonly string DLLSurrogate;
    public readonly string DLLSurrogateExecutable;
    public readonly ImmutableArray<string> EndPoints;
    public readonly ImmutableArray<byte> LaunchPermission;
    public readonly uint? LoadUserSettings;
    public readonly string LocalService;
    public readonly uint? PreferredServerBitness;
    public readonly string RemoteServerName;
    public readonly uint? ROTFlags;
    public readonly string RunAs;
    public readonly string ServiceParameters;
    public readonly uint? SRPTrustLevel;

    public static RegistryAppIDKeyInfo[] GetInfos(
        RegistryView view = RegistryView.Registry64)
    {
        using var hkcr = RegistryKey.OpenBaseKey(RegistryHive.ClassesRoot, view);
        using var appIdsKey = hkcr.OpenSubKey("AppID");

        var infos = new List<RegistryAppIDKeyInfo>();
        foreach (var entryName in appIdsKey.GetSubKeyNames())
        {
            if (!Guid.TryParseExact(entryName, "B", out var appId))
                continue;
            using var appIdKey = appIdsKey.OpenSubKey(entryName);
            infos.Add(new RegistryAppIDKeyInfo(appId, appIdKey));
        }
        return infos.ToArray();
    }

    RegistryAppIDKeyInfo() => throw new InvalidOperationException();

    RegistryAppIDKeyInfo(in Guid guid, RegistryKey key)
    {
        if (key == null)
            throw new ArgumentNullException(nameof(key));
        AppID = guid;
        if (key.GetValue("AccessPermission", null) is byte[] accessPermission)
            AccessPermission = accessPermission.ToImmutableArray();
        ActivateAtStorage = (string)key.GetValue("ActivateAtStorage", null);
        AppIDFlags = (uint?)(int?)key.GetValue("AppIdFlags", null);
        AuthenticationLevel = (uint?)(int?)key.GetValue("AuthenticationLevel", null);
        DLLSurrogate = (string)key.GetValue("DLLSurrogate", null);
        DLLSurrogateExecutable = (string)key.GetValue("DllSurrogateExecutable", null);
        if (key.GetValue("Endpoints", null) is string[] endPoints)
            EndPoints = endPoints.ToImmutableArray();
        if (key.GetValue("LaunchPermission", null) is byte[] launchPermission)
            LaunchPermission = launchPermission.ToImmutableArray();
        LoadUserSettings = (uint?)(int?)key.GetValue("LoadUserSettings", null);
        LocalService = (string)key.GetValue("LocalService", null);
        PreferredServerBitness = (uint?)(int?)key.GetValue("PreferredServerBitness", null);
        RemoteServerName = (string)key.GetValue("RemoteServerName", null);
        ROTFlags = (uint?)(int?)key.GetValue("ROTFlags", null);
        RunAs = (string)key.GetValue("RunAs", null);
        ServiceParameters = (string)key.GetValue("ServiceParameters", null);
        SRPTrustLevel = (uint?)(int?)key.GetValue("SRPTrustLevel", null);
    }
}

.csproj

<Project Sdk="Microsoft.NET.Sdk">
    <PropertyGroup>
        <OutputType>Exe</OutputType>
        <TargetFramework>net5.0-windows</TargetFramework>
        <UseWindowsForms>true</UseWindowsForms>
    </PropertyGroup>
</Project>

Main関数（C# 8）

using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Linq;
using Microsoft.Win32;

class Program
{
    static void Main()
    {
        var infos = RegistryAppIDKeyInfo.GetInfos();

        var infosHasAccessPermission = infos.Where(info => info.AccessPermission != null).ToArray();
        var infosHasActivateAtStorage = infos.Where(info => info.ActivateAtStorage != null).ToArray();
        var infosHasAppIDFlags = infos.Where(info => info.AppIDFlags != null).ToArray();
        var infosHasAuthenticationLevel = infos.Where(info => info.AuthenticationLevel != null).ToArray();
        var infosHasDLLSurrogate = infos.Where(info => info.DLLSurrogate != null).ToArray();
        var infosHasDLLSurrogateExecutable = infos.Where(info => info.DLLSurrogateExecutable != null).ToArray();
        var infosHasEndpoints = infos.Where(info => info.EndPoints != null).ToArray();
        var infosHasLaunchPermission = infos.Where(info => info.LaunchPermission != null).ToArray();
        var infosHasLoadUserSettings = infos.Where(info => info.LoadUserSettings != null).ToArray();
        var infosHasLocalService = infos.Where(info => info.LocalService != null).ToArray();
        var infosHasPreferredServerBitness = infos.Where(info => info.PreferredServerBitness != null).ToArray();
        var infosHasRemoteServerName = infos.Where(info => info.RemoteServerName != null).ToArray();
        var infosHasROTFlags = infos.Where(info => info.ROTFlags != null).ToArray();
        var infosHasRunAs = infos.Where(info => info.RunAs != null).ToArray();
        var infosHasServiceParameters = infos.Where(info => info.ServiceParameters != null).ToArray();
        var infosHasSRPTrustLevel = infos.Where(info => info.SRPTrustLevel != null).ToArray();
    }

    internal sealed class RegistryAppIDKeyInfo
    {
        public readonly Guid AppID;
        public readonly ImmutableArray<byte> AccessPermission;
        public readonly string ActivateAtStorage;
        public readonly uint? AppIDFlags;
        public readonly uint? AuthenticationLevel;
        public readonly string DLLSurrogate;
        public readonly string DLLSurrogateExecutable;
        public readonly ImmutableArray<string> EndPoints;
        public readonly ImmutableArray<byte> LaunchPermission;
        public readonly uint? LoadUserSettings;
        public readonly string LocalService;
        public readonly uint? PreferredServerBitness;
        public readonly string RemoteServerName;
        public readonly uint? ROTFlags;
        public readonly string RunAs;
        public readonly string ServiceParameters;
        public readonly uint? SRPTrustLevel;

        public static RegistryAppIDKeyInfo[] GetInfos(
            RegistryView view = RegistryView.Registry64)
        {
            using var hkcr = RegistryKey.OpenBaseKey(RegistryHive.ClassesRoot, view);
            using var appIdsKey = hkcr.OpenSubKey("AppID");

            var infos = new List<RegistryAppIDKeyInfo>();
            foreach (var entryName in appIdsKey.GetSubKeyNames())
            {
                if (!Guid.TryParseExact(entryName, "B", out var appId))
                    continue;
                using var appIdKey = appIdsKey.OpenSubKey(entryName);
                infos.Add(new RegistryAppIDKeyInfo(appId, appIdKey));
            }
            return infos.ToArray();
        }

        RegistryAppIDKeyInfo() => throw new InvalidOperationException();

        RegistryAppIDKeyInfo(in Guid guid, RegistryKey key)
        {
            if (key == null)
                throw new ArgumentNullException(nameof(key));
            AppID = guid;
            var accessPermission = (byte[])key.GetValue("AccessPermission", null);
            if (accessPermission != null)
                AccessPermission = ImmutableArray.CreateRange(accessPermission);
            ActivateAtStorage = (string)key.GetValue("ActivateAtStorage", null);
            AppIDFlags = (uint?)(int?)key.GetValue("AppIdFlags", null);
            AuthenticationLevel = (uint?)(int?)key.GetValue("AuthenticationLevel", null);
            DLLSurrogate = (string)key.GetValue("DLLSurrogate", null);
            DLLSurrogateExecutable = (string)key.GetValue("DllSurrogateExecutable", null);
            var endPoints = (string[])key.GetValue("Endpoints", null);
            if (endPoints != null)
                EndPoints = ImmutableArray.CreateRange(endPoints);
            var launchPermission = (byte[])key.GetValue("LaunchPermission", null);
            if (launchPermission != null)
                LaunchPermission = ImmutableArray.CreateRange(launchPermission);
            LoadUserSettings = (uint?)(int?)key.GetValue("LoadUserSettings", null);
            LocalService = (string)key.GetValue("LocalService", null);
            PreferredServerBitness = (uint?)(int?)key.GetValue("PreferredServerBitness", null);
            RemoteServerName = (string)key.GetValue("RemoteServerName", null);
            ROTFlags = (uint?)(int?)key.GetValue("ROTFlags", null);
            RunAs = (string)key.GetValue("RunAs", null);
            ServiceParameters = (string)key.GetValue("ServiceParameters", null);
            SRPTrustLevel = (uint?)(int?)key.GetValue("SRPTrustLevel", null);
        }
    }
}

.csproj

<Project Sdk="Microsoft.NET.Sdk.WindowsDesktop">
    <PropertyGroup>
        <OutputType>Exe</OutputType>
        <TargetFramework>netcoreapp3.1</TargetFramework>
        <UseWindowsForms>true</UseWindowsForms>
    </PropertyGroup>
</Project>