public sealed record FileType(string Extension, string MimeType, PercievedFileType PercievedType);
public static void RegisterFileType(string extension, string handlerName, string mimeType, PercievedFileType percievedType)
{
if (string.IsNullOrEmpty(extension))
{
throw new ArgumentNullException(nameof(extension));
}
if (string.IsNullOrEmpty(handlerName))
{
throw new ArgumentNullException(nameof(handlerName));
}
if (!extension.StartsWith("."))
{
extension = "." + extension;
}
bool changed = false;
RegistryKey extensionKey = Registry.CurrentUser.CreateSubKey(Path.Combine(@"Software\Classes", extension));
if (extensionKey != null)
{
extensionKey.SetValue(null, handlerName);
if (!string.IsNullOrEmpty(mimeType) && ((string)extensionKey.GetValue("Content Type") != mimeType))
{
extensionKey.SetValue("Content Type", mimeType, RegistryValueKind.String);
changed = true;
}
if ((percievedType != PercievedFileType.None) && ((string)extensionKey.GetValue("PerceivedType") != percievedType.ToString("g")))
{
extensionKey.SetValue("PerceivedType", percievedType.ToString("g"), RegistryValueKind.String);
changed = true;
}
}
if (changed)
{
Shell32.ChangeNotify(ChangeNotifyEventId.AssociationChanged, ChangeNotifyFlags.IdList);
}
}
public static void RegisterFileType(string extension, string handlerName, string mimeType, PercievedFileType percievedType)
{
if (string.IsNullOrEmpty(extension))
{
throw new ArgumentNullException(nameof(extension));
}
if (string.IsNullOrEmpty(handlerName))
{
throw new ArgumentNullException(nameof(handlerName));
}
if (!extension.StartsWith("."))
{
extension = "." + extension;
}
bool changed = false;
RegistryKey?extensionKey = Microsoft.Win32.Registry.CurrentUser.CreateSubKey(Path.Combine(@"Software\Classes", extension));
if (extensionKey is not null)
{
extensionKey.SetString(null, handlerName);
if (!string.IsNullOrEmpty(mimeType) && !string.Equals(extensionKey.GetString("Content Type"), mimeType, StringComparison.InvariantCulture))
{
extensionKey.SetString("Content Type", mimeType);
changed = true;
}
if ((percievedType != PercievedFileType.None) && !string.Equals(extensionKey.GetString("PerceivedType"), percievedType.ToString("g"), StringComparison.InvariantCulture))
{
extensionKey.SetString("PerceivedType", percievedType.ToString("g"));
changed = true;
}
RegistryKey?openWithKey = extensionKey.CreateSubKey("OpenWithProgids");
if (openWithKey is not null)
{
if (!openWithKey.ContainsName(handlerName))
{
openWithKey.AddName(handlerName);
changed = true;
}
}
}
if (changed)
{
Shell32.ChangeNotify(ChangeNotifyEventId.AssociationChanged, ChangeNotifyFlags.IdList);
}
}
