StandaloneFileBrowserLinux.cs with NullReferenceException

[riveranb]

When using StandaloneFileBrowser in Linux OS (ubuntu), if I choose "CANCEL" or "ESC" in file browse dialog, the returned (string[])paths become null.
And will become NullReferenceException at paths.Split(...);

TO FIX, I suggest:

` public string[] OpenFilePanel(string title, string directory, ExtensionFilter[] extensions, bool multiselect) {
var paths = Marshal.PtrToStringAnsi(DialogOpenFilePanel(
title,
directory,
GetFilterFromFileExtensionList(extensions),
multiselect));

        // debug NullReferenceException
        if (string.IsNullOrEmpty(paths))
        {
            return null;
        }

        return paths.Split((char)28);
    }`

` public string[] OpenFolderPanel(string title, string directory, bool multiselect) {
var paths = Marshal.PtrToStringAnsi(DialogOpenFolderPanel(
title,
directory,
multiselect));

        // debug NullReferenceException
        if (string.IsNullOrEmpty(paths))
        {
            return new string[0];
        }

        return paths.Split((char)28);
    }`

[rhedgeco]

If it returns null, it will not ever reach that second return statement. I think your problem lies somewhere else.

[riveranb]

NullReferenceException happens at StandaloneFileBrowserLinux.cs, line 45 and line 63,
return paths.Split((char)28);

Because paths is null,
So I just try to avoid NullReferenceException in my use cases.

[RicardoEPRodrigues]

I could not find the null error when pressing CANCEL, but I did find it when pressing X. It appears they are different events on GTK.

I made a patch and will make a pull request soon.