public DataBlock GetItemBlock(IEnumerable <ItemIdentity> items, IEnumerable <string> columnNames)
{
// Build a query for them
string query = String.Format("SELECT [System.Id] FROM WorkItems WHERE [System.Id] IN ({0})", String.Join(", ", items.Select((ii) => ii.ID)));
Query q = new Query(this.Store, query, null, false);
// Ask for fields we'll be populating to avoid additional network requests
q.DisplayFieldList.Clear();
foreach (string columnName in columnNames)
{
if (this.Store.FieldDefinitions.Contains(columnName))
{
q.DisplayFieldList.Add(this.Store.FieldDefinitions[columnName]);
}
else if (columnName.Equals("attachments", StringComparison.OrdinalIgnoreCase))
{
// Add AttachedFileCount to greatly speed loading attachments (if this is the only collection; rare)
q.DisplayFieldList.Add(this.Store.FieldDefinitions[CoreField.AttachedFileCount]);
}
}
// Build a list of typed column details for the columns being used
List <ColumnDetails> selectedDetails = new List <ColumnDetails>();
foreach (string columnName in columnNames)
{
selectedDetails.Add(this.Columns[columnName]);
}
// Run the query
ICancelableAsyncResult car = q.BeginQuery();
WorkItemCollection itemCollection = q.EndQuery(car);
// Copy the item field values into a DataBlock and track the last cutoff per group
DataBlock result = new DataBlock(selectedDetails, items.Count());
for (int itemIndex = 0; itemIndex < result.RowCount; ++itemIndex)
{
WorkItem item = itemCollection[itemIndex];
int fieldIndex = 0;
foreach (string columnName in columnNames)
{
try
{
result[itemIndex, fieldIndex] = ItemProviderUtilities.Canonicalize(GetFieldValue(item, columnName));
}
catch (Exception ex)
{
result[itemIndex, fieldIndex] = null;
Trace.WriteLine(String.Format("Error Getting '{0}' from item {1}. Skipping field. Detail: {2}", columnName, item.Id, ex.ToString()));
}
fieldIndex++;
}
}
return(result);
}
private List <ItemIdentity> ExtractOneSet(string query, List <ItemIdentity> result)
{
Query q = new Query(this.Store, query, null, false);
// Ask for ID only - we don't need anything else
q.DisplayFieldList.Clear();
q.DisplayFieldList.Add(this.Store.FieldDefinitions[CoreField.Id]);
q.DisplayFieldList.Add(this.Store.FieldDefinitions[CoreField.ChangedDate]);
// Sort by ChangedDate ascending for restartability
q.SortFieldList.Clear();
q.SortFieldList.Add(this.Store.FieldDefinitions[CoreField.ChangedDate].Name, SortType.Ascending);
try
{
// Run the query
ICancelableAsyncResult car = q.BeginQuery();
WorkItemCollection items = q.EndQuery(car);
// Set PageSize to Maximum, since we'll be reading all of them anyway.
items.PageSize = 200;
// Record the IDs to load
int count = items.Count;
for (int i = 0; i < count; ++i)
{
WorkItem item = items[i];
result.Add(new ItemIdentity(item.Id, ItemProviderUtilities.CanonicalizeDateTime(item.ChangedDate)));
}
}
catch (VerbatimMessageException ex)
{
Match match = Regex.Match(ex.Message, @"VS402337: The number of work items returned exceeds the size limit of (?<BatchSize>\d+)\.");
if (match.Success)
{
return(null);
}
else
{
throw;
}
}
return(result);
}
