How to update a custom TFS field programmatically

We have a custom build process (not using MS Build) and during that process I am adding a "fake" build to the globa开发者_高级运维l builds list. The reason I am doing that is so that you can select the build for a given work item (found in build). We have a custom field, build included, which is intended to show which build that work item was fixed in. I am having trouble figuring out how to update this field programmatically. The idea is I will have a small app that does this that I will call during the build process, finding all work items since the last build, then updating the field for those work items. Any ideas?

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Something like this should work for you:

public void UpdateTFSValue(string tfsServerUrl, string fieldToUpdate, 
   string valueToUpdateTo, int workItemID)
{   
    // Connect to the TFS Server
    TfsTeamProjectCollection tfs = new TfsTeamProjectCollection(new Uri(tfsUri));
    // Connect to the store of work items.
    _store = (WorkItemStore)tfs.GetService(typeof(WorkItemStore));
    // Grab the work item we want to update
    WorkItem workItem = _store.GetWorkItem(workItemId);
    // Open it up for editing.  (Sometimes PartialOpen() works too and takes less time.)
    workItem.Open();
    // Update the field.
    workItem.Fields[fieldToUpdate] = valueToUpdateTo;
    // Save your changes.  If there is a constraint on the field and your value does not 
    // meet it then this save will fail. (Throw an exception.)  I leave that to you to
    // deal with as you see fit.
    workItem.Save();    
}

An example of calling this would be:

UpdateTFSValue("http://tfs2010dev:8080/tfs", "Integration Build", "Build Name", 1234);

The variable fieldToUpdate should be the name of the field, not the refname (ie. Integration Build, not Microsoft.VSTS.Build.IntegrationBuild)

You could probably get away with using PartialOpen(), but I am not sure.

You will probably need to add Microsoft.TeamFoundation.Client to your project. (And maybe Microsoft.TeamFoundation.Common)

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This has changed for TFS 2012, basicly you have to add workItem.Fields[fieldToUpdate].Value

Updated Version of what @Vaccano wrote.

public void UpdateTFSValue(string tfsServerUrl, string fieldToUpdate, 
   string valueToUpdateTo, int workItemID)
{   
    // Connect to the TFS Server
    TfsTeamProjectCollection tfs = new TfsTeamProjectCollection(new Uri(tfsUri));
    // Connect to the store of work items.
    _store = (WorkItemStore)tfs.GetService(typeof(WorkItemStore));
    // Grab the work item we want to update
    WorkItem workItem = _store.GetWorkItem(workItemId);
    // Open it up for editing.  (Sometimes PartialOpen() works too and takes less time.)
    workItem.Open();
    // Update the field.
    workItem.Fields[fieldToUpdate].Value = valueToUpdateTo;
    // Save your changes.  If there is a constraint on the field and your value does not 
    // meet it then this save will fail. (Throw an exception.)  I leave that to you to
    // deal with as you see fit.
    workItem.Save();    
}