Yes - i tried it and it worked.

There is no such thing as an "extension" class - there are only extension methods which must be inside a "static" class.

You can have static partial classes.

UPDATE: Sorry I read your heading but not the text of your question.
The answer is still yes, but why not just create new classes? I can't see how having a partial class really helps in this case.

C#: Is it possible to have partial extension classes
I am getting the following error when I attempt to get a typeahead values from AngularUI-Bootstrap, using a promise.

TypeError: Cannot read property 'length' of undefined
  at http://localhost:8000/static/js/ui-bootstrap-tpls-0.6.0.min.js:1:37982
  at i (http://localhost:8000/static/js/angular.min.js:79:437)
  at i (http://localhost:8000/static/js/angular.min.js:79:437)
  at http://localhost:8000/static/js/angular.min.js:80:485
  at Object.e.$eval (http://localhost:8000/static/js/angular.min.js:92:272)
  at Object.e.$digest (http://localhost:8000/static/js/angular.min.js:90:142)
  at Object.e.$apply (http://localhost:8000/static/js/angular.min.js:92:431)
  at HTMLInputElement.Va.i (http://localhost:8000/static/js/angular.min.js:120:156)
  at HTMLInputElement.x.event.dispatch (http://localhost:8000/static/js/jquery-1.10.2.min.js:5:14129)
  at HTMLInputElement.v.handle (http://localhost:8000/static/js/jquery-1.10.2.min.js:5:10866) 


My HTML tag is:

&lt;input type="text" class="form-control" id="guestName" ng-model="name" typeahead="name for name in getTypeaheadValues($viewValue)"&gt;


With my getTypeaheadValues function doing the following:

$scope.getTypeaheadValues = function($viewValue)
{
    // return ['1','2','3','4'];

    $http({
        method: 'GET',
        url: 'api/v1/person?name__icontains=' + $viewValue
    }).error(function ($data) {
        console.log("failed to fetch typeahead data");
    }).success(function ($data) {
        var output = [];
        $data.objects.forEach(function (person)
        {
            output.push(person.name);
        });
        console.log(output);
        return output;
    });
}


I do not understand what AngularUI-Bootstrap is complaining about as being undefined.  If I remove the comment on the top-most return the values show up fine.  The console.log output in the success also return all the values I'm expecting in an array.

What am I missing that would cause AngularUI-Bootstrap not see the returned array?
