public static Icon FromExtension(string fileOrExtension, SystemIconSize size)
{
if (fileOrExtension == null)
{
throw new ArgumentNullException(nameof(fileOrExtension), PublicResources.ArgumentNull);
}
if (!Enum <SystemIconSize> .IsDefined(size))
{
throw new ArgumentOutOfRangeException(nameof(size), PublicResources.EnumOutOfRangeWithValues(size));
}
if (!OSUtils.IsWindows)
{
return(SystemIcons.WinLogo);
}
if (!Path.HasExtension(fileOrExtension))
{
fileOrExtension = Path.GetFileName(fileOrExtension) == fileOrExtension ? '.' + fileOrExtension : ".";
}
IntPtr handle = Shell32.GetFileIconHandle(fileOrExtension, size);
if (handle == IntPtr.Zero)
{
throw new ArgumentException(PublicResources.ArgumentInvalidString, nameof(fileOrExtension));
}
return(Icon.FromHandle(handle).ToManagedIcon());
}