/// <summary>
/// 创建动态活动
/// </summary>
/// <param name="createActivitiesParamsFetcher"></param>
/// <returns></returns>
private IList <IWfActivityDescriptor> InternalGenerateDynamicActivities(Func <WfCreateActivityParamCollection> createActivitiesParamsFetcher)
{
createActivitiesParamsFetcher.NullCheck("createActivitiesParamsFetcher");
List <IWfActivityDescriptor> result = null;
//随便找一条进线和活动，构造动态活动的起始点。
IWfTransitionDescriptor firstTemplateTransition = this.FromTransitions.FirstOrDefault();
if (firstTemplateTransition != null)
{
//寻找动态活动的前一个点，如果有多个点，随机选取一个
WfActivityDescriptor startActDesp = (WfActivityDescriptor)firstTemplateTransition.FromActivity;
IWfTransitionDescriptor dynInTransition = startActDesp.FindExsitedDynamicToTransition(this);
////没有生成过，或者已经生成过，且生成的活动还没有执行
if (dynInTransition == null || InstanceIsRunning(dynInTransition.ToActivity) == false)
{
//如果已经生成过
if (dynInTransition != null)
{
DeleteExistedDynamicActivities(dynInTransition, this);
}
WfCreateActivityParamCollection createActivityParams = createActivitiesParamsFetcher();
//活动矩阵定义的属性优先于活动模板定义的属性，矩阵中没有设置的属性，则使用活动模版的属性
MergeDynamicActivitiesProperties(createActivityParams, this);
WfActivityDescriptorCollection createdActivities = CreateActivities(this.FromTransitions, createActivityParams, this.ToTransitions);
ChangeNewDynActivitiesProperties(createdActivities, this);
result = new List <IWfActivityDescriptor>();
createdActivities.CopyTo(result);
}
}
return(result);
}
