Create One-to-Many Work Item Links Programmatically in TFS 2013

Question

Hello,
I urgently require some help with this problem please.
I have a number of existing work item types - for illustration purposes, let's call them Work Item Parents and Work Item Children. Remaining details are as follows:
I have thousands of Work Items of type Parents
I have hundreds of Work Items of type Children
The Work Item Parents have a One to Many relationship with the Work Item Children
Both Work Item types have already been added to TFS and we now need to associate or link Parent items with their corresponding Child items.
Due to the sheer number of items described above, linking the  Parent items with their respective Child items would be a complete "No-No" as it could take forever to complete and would be prone to error.
What I'm therefore seeking is the ability to programmatically associate or link the two work item types where required.
Any advice on how to achieve this would therefore be greatly appreciated.
Thank you.
PS: The link type between my work item types do not necessarily have to be of a Parent-Child relationship. "Related" work items will do just fine.

Answer 1

Hi RegManteaw,  
Thanks for your reply.
We can get the wanted Bug work items and Task work items using
WorkItemCollection, you should use the logic code to handle which Task work items linked to which Bug work item. For example, I defined 5 Bug work items within “b1” tag, and 10 Task work items within “t1” in my test
team project, then I run the below code snippet to get that Bug/Task work items and link 2 Task work items to one Bug work item.
TfsTeamProjectCollection tfs =
new
TfsTeamProjectCollection(new
Uri("collectionURL"));
tfs.EnsureAuthenticated();
WorkItemStore workitemstore = tfs.GetService<WorkItemStore>();
try
// get “b1” bug work items(5) from test team project
string wiql =
"SELECT [System.Id] FROM WorkItems WHERE [System.TeamProject] = 'teamprojectname' 
AND  [System.WorkItemType] = 'Bug'  AND 
[System.Tags] CONTAINS 'b1'";
WorkItemCollection Bwic = workitemstore.Query(wiql);
// get “t1” task work items(10) from test team project
string wiql2 =
"SELECT [System.Id] FROM WorkItems WHERE [System.TeamProject] = 'teamprojectname' 
AND  [System.WorkItemType] = 'Task' AND 
[System.Tags] CONTAINS 't1'";
WorkItemCollection Twic = workitemstore.Query(wiql2);
//two task work items linked to one bug work item
for(int
i =0;i<=4;i++)
//define the link type
WorkItemLinkTypeEnd linkTypeEnd = workitemstore.WorkItemLinkTypes.LinkTypeEnds["Related"];
//link first task to bug
Bwic[i].Links.Add(new
RelatedLink(linkTypeEnd, Twic[(i * 2)].Id));
         Bwic[i].Save();
//link second task to bug
Bwic[i].Links.Add(new
RelatedLink(linkTypeEnd, Twic[(i * 2 + 1)].Id));
Bwic[i].Save();
catch(Exception
e)
Console.WriteLine(e.Message);
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