Error VS403357 when batch creating many work items in Azure DevOps using .NET API - azure-devops

Question

I'm trying to use the Azure DevOps .NET API to batch create WorkItems in a AzureDevOps repository, but when I submit the batch request, I'm getting back an error message: "VS403357: Work items in the batch are expected to be unique, but found work item with ID -1 in more than one request."
Here's my code:
public void ExecuteWorkItemMigration(int[] workItemIds, IProgress<ProgressResult> progress = null)
{
var wiql = "SELECT * FROM WorkItems";
var query = new Query(_workItemStore, wiql, workItemIds);
var workItemCollection = query.RunQuery();
string projectName = MainSettings.AzureDevOpsSettings.ProjectName;
List<WitBatchRequest> batchRequests = new List<WitBatchRequest>();
foreach (WorkItemTfs tfsWorkItem in workItemCollection)
{
JsonPatchDocument document = CreateJsonPatchDocument(tfsWorkItem);
string workItemType = GetWorkItemType(tfsWorkItem);
WitBatchRequest wibr = _azureDevopsWorkItemTrackingClient.CreateWorkItemBatchRequest(projectName, workItemType,
document, true, true);
batchRequests.Add(wibr);
}
List<WitBatchResponse> results = _azureDevopsWorkItemTrackingClient.ExecuteBatchRequest(batchRequests).Result;
}
private static JsonPatchDocument CreateJsonPatchDocument(WorkItemTfs tfsWorkItem, int id = -1)
{
var document = new JsonPatchDocument();
document.Add(
new JsonPatchOperation
{
Path = "/id",
Operation = Operation.Add,
Value = id
});
document.Add(
new JsonPatchOperation
{
Path = "/fields/System.Title",
Operation = Operation.Add,
Value = tfsWorkItem.Title
});
if (tfsWorkItem.Fields.Contains("ReproSteps"))
document.Add(
new JsonPatchOperation
{
Path = "/fields/Microsoft.VSTS.TCM.ReproSteps",
Operation = Operation.Add,
Value = tfsWorkItem.Fields["ReproSteps"].Value
});
}
Any suggestions about what I need to do to get this working properly?
I have tried submitting different unique ID's but it doesn't seem to prevent the error from happening.

Answer 1

You need to use unique negative ID's for creating the WorkItem ID.
Something like this:
public void ExecuteWorkItemMigration(int[] workItemIds, IProgress<ProgressResult> progress = null)
{
var wiql = "SELECT * FROM WorkItems";
var query = new Query(_workItemStore, wiql, workItemIds);
var workItemCollection = query.RunQuery();
string projectName = MainSettings.AzureDevOpsSettings.ProjectName;
List<WitBatchRequest> batchRequests = new List<WitBatchRequest>();
int id = -1;
foreach (WorkItemTfs tfsWorkItem in workItemCollection)
{
JsonPatchDocument document = CreateJsonPatchDocument(tfsWorkItem, id--);
string workItemType = GetWorkItemType(tfsWorkItem);
WitBatchRequest wibr = _azureDevopsWorkItemTrackingClient.CreateWorkItemBatchRequest(projectName, workItemType,
document, true, true);
batchRequests.Add(wibr);
}
List<WitBatchResponse> results = _azureDevopsWorkItemTrackingClient.ExecuteBatchRequest(batchRequests).Result;
}