Gets full name of Appx Package and family name

CSharpGetAppxFullName

private static string GetPackageFamilyName(string name, string publisherId)
{
    string packageFamilyName = null;
    PACKAGE_ID packageId = new PACKAGE_ID
    {
        name = name,
        publisher = publisherId
    };
    uint packageFamilyNameLength = 0;
    //First get the length of the Package Name -> Pass NULL as Output Buffer
    if (PackageFamilyNameFromId(packageId, ref packageFamilyNameLength, null) == 122) //ERROR_INSUFFICIENT_BUFFER
    {
        StringBuilder packageFamilyNameBuilder = new StringBuilder((int)packageFamilyNameLength);
        if (PackageFamilyNameFromId(packageId, ref packageFamilyNameLength, packageFamilyNameBuilder) == 0)
        {
            packageFamilyName = packageFamilyNameBuilder.ToString();
        }
    }
    return packageFamilyName;
}

public enum APPX_PACKAGE_ARCHITECTURE : uint
{
    APPX_PACKAGE_ARCHITECTURE_X86 = 1,
    APPX_PACKAGE_ARCHITECTURE_ARM = 5,
    APPX_PACKAGE_ARCHITECTURE_X64 = 9,
    APPX_PACKAGE_ARCHITECTURE_NEUTRAL = 11,
    APPX_PACKAGE_ARCHITECTURE_ARM64 = 12,
};

// Declares managed structures instead of unions.
[StructLayout(LayoutKind.Explicit)]
public struct PackageVersion
{
    public PackageVersion(ulong version) : this()
    {
        Version = version;
    }

    public PackageVersion(ushort major, ushort minor, ushort build, ushort revision) : this()
    {
        Revision = revision;
        Build = build;
        Minor = minor;
        Major = major;
    }

    public PackageVersion(Version version) : this((ushort)version.Major, (ushort)version.Minor, (ushort)version.Build, (ushort)version.Revision)
    {
    }

    public PackageVersion(string version) : this(System.Version.Parse(version))
    {
    }


    [FieldOffset(0 * sizeof(ulong))]
    public ulong Version;

    [FieldOffset(0 * sizeof(ushort))]
    public ushort Revision;

    [FieldOffset(1 * sizeof(ushort))]
    public ushort Build;

    [FieldOffset(2 * sizeof(ushort))]
    public ushort Minor;

    [FieldOffset(3 * sizeof(ushort))]
    public ushort Major;
}

private static string GetPackageFullName(string name, string publisherId, APPX_PACKAGE_ARCHITECTURE architecture, PackageVersion version = default, string resourceId = null)
{
    string packageFullName = null;
    PACKAGE_ID packageId = new PACKAGE_ID
    {
        name = name,
        publisher = publisherId,
        processorArchitecture = (uint)architecture,
        version = version.Version,
        resourceId = resourceId
    };

    uint packageFamilyNameLength = 0;
    //First get the length of the Package Name -> Pass NULL as Output Buffer
    if (PackageFullNameFromId(packageId, ref packageFamilyNameLength, null) == 122) //ERROR_INSUFFICIENT_BUFFER
    {
        StringBuilder packageFamilyNameBuilder = new StringBuilder((int)packageFamilyNameLength);
        if (PackageFullNameFromId(packageId, ref packageFamilyNameLength, packageFamilyNameBuilder) == 0)
        {
            packageFullName = packageFamilyNameBuilder.ToString();
        }
    }
    return packageFullName;
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode, Pack = 4)]
private class PACKAGE_ID
{
    public uint reserved;
    public uint processorArchitecture;
    public ulong version;
    public string name;
    public string publisher;
    public string resourceId;
    public string publisherId;
}


[DllImport("kernel32.dll", CharSet = CharSet.Unicode, ExactSpelling = true)]
private static extern uint PackageFamilyNameFromId(PACKAGE_ID packageId, ref uint packageFamilyNameLength, StringBuilder packageFamilyName);

[DllImport("kernel32.dll", CharSet = CharSet.Unicode, ExactSpelling = true)]
private static extern uint PackageFullNameFromId(PACKAGE_ID packageId, ref uint packageFamilyNameLength, StringBuilder packageFamilyName);