/// <summary>
/// 得到可以抵达的线
/// </summary>
/// <returns></returns>
public WfTransitionDescriptorCollection GetAllCanTransitTransitions()
{
WfTransitionDescriptorCollection result = CreateNewCollection();
foreach (WfTransitionDescriptor transition in this)
{
if (transition.CanTransit())
{
result.Add(transition);
}
}
return(result);
}
private static WfTransitionDescriptorCollection FindCanTransitTransitions(IWfProcess process, WfTransitionDescriptorCollection transitions)
{
WfTransitionDescriptorCollection result = null;
if (WfContext.Current.AutoFindPassedTransitions)
{
IWfTransitionDescriptor transition = FindNearestPassedTransitionDescriptor(process, transitions);
result = transitions.CreateNewCollection();
if (transition != null)
{
result = transitions.CreateNewCollection();
result.Add(transition);
}
else
{
result = transitions.GetAllCanTransitTransitions();
}
}
else
{
try
{
result = transitions.GetAllCanTransitTransitions();
}
catch (WfTransitionEvaluationException ex)
{
IWfTransitionDescriptor transition = FindNearestPassedTransitionDescriptor(process, transitions);
if (transition != null)
{
result = transitions.CreateNewCollection();
result.Add(transition);
}
else
{
throw ex;
}
}
}
return(result);
}
private static void FindNextStepActivityDescriptor(
IWfActivityDescriptor currentAct,
bool autoCalcaulatePath,
IWfProcess process,
List <IWfActivityDescriptor> alreadyScanedActivities)
{
IWfActivityDescriptor act = null;
int maxPriority = 255;
WfTransitionDescriptorCollection transitions = null;
if (autoCalcaulatePath == false)
{
transitions = currentAct.ToTransitions;
}
else
{
transitions = FindCanTransitTransitions(process, currentAct.ToTransitions);
}
IWfActivityDescriptor target = GetTransitionValidTarget(transitions.FindDefaultSelectTransition());
if (target != null)
{
if (alreadyScanedActivities.Exists(a => a.Key == target.Key) == false)
{
act = target;
}
}
if (act == null)
{
foreach (IWfTransitionDescriptor transition in transitions)
{
target = GetTransitionValidTarget(transition);
if (target != null)
{
if (alreadyScanedActivities.Exists(a => a.Key == target.Key) == false)
{
if (string.IsNullOrEmpty(target.LevelName) == false)
{
if (transition.Priority < maxPriority)
{
act = target;
maxPriority = transition.Priority;
}
}
}
}
}
}
if (act != null)
{
if (act is IWfCompletedActivityDescriptor == false)
{
alreadyScanedActivities.Add(act);
FindNextStepActivityDescriptor(act, autoCalcaulatePath, process, alreadyScanedActivities);
}
}
}
/// <summary>
/// 在线中，查找最接近的经过的线
/// </summary>
/// <param name="process"></param>
/// <param name="transitionDesps"></param>
/// <returns></returns>
private static IWfTransitionDescriptor FindNearestPassedTransitionDescriptor(IWfProcess process, WfTransitionDescriptorCollection transitionDesps)
{
IWfTransitionDescriptor result = null;
if (process != null)
{
IWfActivity currentActivity = process.LastActivity;
while (currentActivity != null)
{
IWfTransitionDescriptor fromTransitionDescriptor = currentActivity.FromTransitionDescriptor;
if (fromTransitionDescriptor != null)
{
if (transitionDesps.Exists(t => t.Key == fromTransitionDescriptor.Key))
{
result = fromTransitionDescriptor;
break;
}
}
if (currentActivity.FromTransition != null)
{
currentActivity = currentActivity.FromTransition.FromActivity;
}
else
{
currentActivity = null;
}
}
}
return(result);
}
