/// <summary>
/// Get the existing sync state for this item, if it exists and is of the appropriate
/// type, else null.
/// </summary>
/// <remarks>Outlook items are not true objects and don't have a common superclass,
/// so we have to use this rather clumsy overloading.</remarks>
/// <param name="task">The item.</param>
/// <returns>The appropriate sync state, or null if none.</returns>
/// <exception cref="UnexpectedSyncStateClassException">if the sync state found is not of the expected class (shouldn't happen).</exception>
public TaskSyncState GetSyncState(Outlook.TaskItem task)
{
SyncState result;
try
{
result = this.byOutlookId.ContainsKey(task.EntryID) ? this.byOutlookId[task.EntryID] : null;
CrmId crmId = result == null?task.GetCrmId() : CheckForDuplicateSyncState(result, task.GetCrmId());
if (CrmId.IsValid(crmId))
{
if (result == null && this.byCrmId.ContainsKey(crmId))
{
result = this.byCrmId[crmId];
}
else if (result != null && crmId != null && this.byCrmId.ContainsKey(crmId) == false)
{
this.byCrmId[crmId] = result;
result.CrmEntryId = crmId;
}
}
if (result != null && !(result is TaskSyncState))
{
throw new UnexpectedSyncStateClassException("TaskSyncState", result);
}
}
catch (COMException)
{
// dead item passed.
result = null;
}
return(result as TaskSyncState);
}
/// <summary>
/// Create an appropriate sync state for an task item.
/// </summary>
/// <remarks>Outlook items are not true objects and don't have a common superclass,
/// so we have to use this rather clumsy overloading.</remarks>
/// <param name="task">The item.</param>
/// <returns>An appropriate sync state, or null if the task was invalid.</returns>
private TaskSyncState CreateSyncState(Outlook.TaskItem task)
{
TaskSyncState result;
CrmId crmId = task.GetCrmId();
if (CrmId.IsValid(crmId) && this.byCrmId.ContainsKey(crmId) && this.byCrmId[crmId] != null)
{
result = CheckUnexpectedFoundState <Outlook.TaskItem, TaskSyncState>(task, crmId);
}
else
{
result = this.SetByOutlookId <TaskSyncState>(task.EntryID,
new TaskSyncState(task, crmId,
ParseDateTimeFromUserProperty(task.UserProperties[ModifiedDatePropertyName])));
}
if (result != null && CrmId.IsValid(crmId))
{
this.byCrmId[crmId] = result;
}
return(result);
}