TFS API - How to fetch work item(s) from specific Team Project

Question

I am trying to query a single team project in the main TfsTeamProjectCollection which contains 194 Team Projects in total. I know exactly how to get a WorkItem by Id from a WorkItemStore . The thing is, that by doing this, the API searches in ALL of the projects in the collection and the query takes about a minute. This is way too slow, there must be a way to query work items directly from a single team project ? Here is the code I have:

    private Uri collectionUri;
    private TfsTeamProjectCollection projectCollection;
    private WorkItemStore workItemStore;

    public Project GetTeamProject()
    {
        projectCollection = TfsTeamProjectCollectionFactory.GetTeamProjectCollection(collectionUri);

        workItemStore = projectCollection.GetService<WorkItemStore>();
        Project teamProject = workItemStore.Projects[TFS_PROJECT_KEY];
        return teamProject;
    }

Now that I have the Team Project I'm interested in, how can I query for work items by ID or just get all work items in this project ?

Answer 1

You could try something like this for getting all WIs within teamProject :

WorkItemCollection workItemCollection = workItemStore.Query(
     " SELECT [System.Id], [System.WorkItemType],"+    
     " [System.State], [System.AssignedTo], [System.Title] "+ 
     " FROM WorkItems " +
     " WHERE [System.TeamProject] = '" + teamProject.Name +
    "' ORDER BY [System.WorkItemType], [System.Id]");

And this to get a specific WorkItem ID:

WorkItem workItem = workItemStore.GetWorkItem(555);

Answer 2

It's probably most efficient to use a query to find the workitems you're interested in. You can add a Where project = '@Project' to the query to limit the scope to just that project. By first calling BeginQuery and then EndQuery you'll get a workitem collection for just the items you were looking for.

The easiest way to get the required wql query is to create a query in Team Explorer, then use file->save as (in edit mode) to save it to file. Open that file in Notepad to copy the query out of there.

Alternatively you can use the WorkItemStore.Query method directly to achieve the same thing.