Under certain circumstances my desktop app using SharePoint web services ends up with DefaultNetworkCredentials having null values, and so the call fails. I need to then obtain the users credentials, but I haven't found a straightfoward way to do so.
I'm considering implementing the solution outlined in http://www.pinvoke.net/default.aspx/credui/CredUIPromptForCredentialsW.html
... however, this still is going to require that I handle the password, which I'd really rather not do. I've looked, but haven't been able to find a more direct method that prompts the user and returns a NetworkCredential directly, without my having to store the password?
Thanks,
EDIT: It looks like I'm not going to find exactly what I'm looking for... I'll have to prompt the user myself when this happens.
However, if I'm interpreting some of these answers correctly, it may be an error condition for the DefaultNetworkCredentials to be null like this in the first place. Is that the case? Is there a way to force the DefaultNetworkCredentials to populate, or is it really a simple cache that's just remembering the last domain/userid/password used for the target URI (that day? that application/session?).
I don't think you can avoid handling them for the first time. But, you an hook into the Credential Manager so that they will be cached from that point forward. Here's an article on how to do that. It's heavy in p/invoke, but could give your users a more consistent experience.