WIQL query to get all item under a workitem - tfs

Question

I am looking for a query where i can return all work items and their relation from a area path.
for example : project 1
i need all Featured all Userstories mapped to it all workitem and Bug mapped to userstories,
in short if i took a bug from the object i need somthing like parent id where i can match with the userstory.
string query1 = " SELECT * FROM WorkItemLinks " +
" WHERE ( [System.IterationPath] Under 'iteration1' )" +
" AND ([System.Links.LinkType] = 'System.LinkTypes.Hierarchy-Forward' )" +
" ORDER BY [Microsoft.VSTS.Scheduling.StartDate]";
which throwing an error like below
An exception of type 'Microsoft.TeamFoundation.WorkItemTracking.Client.ValidationException' occurred in Microsoft.TeamFoundation.WorkItemTracking.Client.dll but was not handled in user code
Additional information: TF51005: The query references a field that does not exist. The error is caused by «[System.IterationPath]».
when i checked the dll's are refereed correctly and when i re wrote the query like this the query is working fine
string query = " SELECT * FROM WorkItems"+
" WHERE ( [System.IterationPath] Under 'iteration1' )" +
//" AND ([System.State] = 'Active' OR [System.State] = 'Assessed' ) "+
//" AND ( [Microsoft.VSTS.Scheduling.StartDate] <= '09/13/2017' AND [Microsoft.VSTS.Scheduling.FinishDate] >= '09/13/2017' )"+
" ORDER BY [Microsoft.VSTS.Scheduling.StartDate]";
but this query result does not give the relation ship that if a work item mapped as a child to other i need parent id in the work item object. how to get that. Thanks in advance.

Answer 1

You can try below query:
Install Nuget Package Microsoft.TeamFoundationServer.ExtendedClient for the project.
using Microsoft.TeamFoundation.Client;
using Microsoft.TeamFoundation.WorkItemTracking.Client;
using System;
namespace _0925_WIQL
{
class Program
{
static void Main(string[] args)
{
TfsTeamProjectCollection tpc = new TfsTeamProjectCollection(
new Uri("http://server:8080/tfs/CollectionLC"));
WorkItemStore workItemStore = (WorkItemStore)tpc.GetService(typeof(WorkItemStore));
string query1= " SELECT * FROM WorkItemLinks " +
" WHERE ( Source.[System.IterationPath] Under 'TeamProject\\Iteration 1' )" +
" AND ([System.Links.LinkType] = 'System.LinkTypes.Hierarchy-Forward' )" +
" ORDER BY [Microsoft.VSTS.Scheduling.StartDate]";
Query query = new Query(workItemStore, query1);
WorkItemLinkInfo[] witLinkInfos = query.RunLinkQuery();
foreach (WorkItemLinkInfo witinfo in witLinkInfos)
{
.......
}
Besides, you can also use Wiql Editor. If you want to get all the parent workitems (IDs) from a specific child work item (ID), you can use below WIQL:
SELECT
[System.Id],
[System.WorkItemType],
[System.Title],
[System.AssignedTo],
[System.State]
FROM workitemLinks
WHERE ([System.Links.LinkType] = 'System.LinkTypes.Hierarchy-Forward')
AND ([Target].[System.Id] = 25)
ORDER BY [System.Id]
MODE (Recursive, ReturnMatchingChildren)