/// <summary>
/// Converts a value to another type.
/// </summary>
/// <param name="value">
/// The value to convert.
/// </param>
/// <param name="targetType">
/// The type to convert to.
/// </param>
/// <param name="parameter">
/// An optional parameter.
/// </param>
/// <param name="culture">
/// The UI culture to convert to.
/// </param>
/// <returns>
/// The converted value.
/// </returns>
public object?Convert(object?value, Type targetType, object parameter, CultureInfo culture)
{
if (targetType != typeof(string))
{
throw new InvalidOperationException("Cannot convert to any type except System.String");
}
if (value == null)
{
return(FallbackValue);
}
var path = (string)value;
if (!Path.IsPathRooted(path))
{
throw new ArgumentException("Path must be rooted", nameof(value));
}
Shell32.IShellItem2 item = Shell32.SHCreateItemFromParsingName <Shell32.IShellItem2>(path);
Shell32.SIGDN sigdn = DisplayMode switch
{
FileNameDisplayMode.Default => Shell32.SIGDN.SIGDN_NORMALDISPLAY,
FileNameDisplayMode.FullPath => Shell32.SIGDN.SIGDN_FILESYSPATH,
FileNameDisplayMode.NameOnly => Shell32.SIGDN.SIGDN_PARENTRELATIVEPARSING,
_ => throw new InvalidOperationException($"Unexpected {nameof(FileNameDisplayMode)}")
};
return(item.GetDisplayName(sigdn));
}
HRESULT Shell32.IShellItem.GetDisplayName(Shell32.SIGDN sigdnName, out string?ppszName)
{
IntPtr ppszName_local;
HRESULT retVal;
retVal = ((delegate * unmanaged <IntPtr, int, IntPtr *, HRESULT>)(*(*(void ***)_wrappedInstance + 5)))
(_wrappedInstance, (int)sigdnName, &ppszName_local);
ppszName = Marshal.PtrToStringUni(ppszName_local);
Marshal.FreeCoTaskMem(ppszName_local);
return(retVal);
}
