TfsTeamProjectCollectionFactory.GetTeamProjectCollection failing despite available TFS server

So, I have a TFS server at http://mytfsserver:8080. I'm connected to it fine from visual studio doing all the usual TFSy things without any issue at all.

I'm trying to connect from code though - I do the following:

tfs 开发者_如何学编程=  TfsTeamProjectCollectionFactory.GetTeamProjectCollection(new Uri("http://mytfsserver:8080"));
tfs.EnsureAuthenticated();

But I get a TeamFoundationServiceUnavailableException.

I'm not connecting to my server in any funny ways, so what is different about what I'm doing to what VS does when it connects?

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You just need to add the collection name at the end of the Uri

var tfs = TfsTeamProjectCollectionFactory.GetTeamProjectCollection(
    new Uri("http://TFS:8080/TFS/DefaultCollection"));

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Try adding /tfs to your server URI.

var tfsServerUri = new Uri("http://mytfsserver:8080/tfs");
var tfs = TfsTeamProjectCollectionFactory.GetTeamProjectCollection(tfsServerUri);
tfs.EnsureAuthenticated();