以编程方式完成条件业务流程时抛出异常

Question

以下是商机实体上的业务流程 (BPF)。我创建了一个插件，可以自动将此 BPF 推进到更新机会上的字段的最后阶段。

当为满足上图条件（并因此利用 BPF 的所有阶段）的机会发送 RetrieveActivePathRequest 消息时，我收到 RetrieveActivePathResponse 并且我的插件按预期工作：

        // Retrieve the process stages in the active path of the current process instance
        RetrieveActivePathRequest activePathRequest = new RetrieveActivePathRequest
        {
            ProcessInstanceId = activeProcessId
        };

        RetrieveActivePathResponse activePathResponse = (RetrieveActivePathResponse)service.Execute(activePathRequest);

但是，为不满足条件的机会（因此仅利用 BPF 的前三个阶段）发送 RetrieveActivePathRequest 消息会导致 System.ServiceModel.FaultException。

我怀疑这可能是由于 BPF 中的“else”条件没有分支到某个阶段。我添加了一个共享阶段并将其与“其他”条件和上图所示的最后一个阶段连接起来，不再遇到异常。我的插件按预期工作并自动推进了 BPF。

两个问题：

1. 为什么会这样？在任一场景中，我都可以手动推进每个阶段并完成 BPF，那为什么我不能以编程方式做同样的事情呢？

2. 是否有替代方法来处理这种情况，以便我可以使用我的插件自动推进 BPF（原样）？如果可能的话，我宁愿不创建共享阶段或两个单独的 BPF。

编辑：

如果有人好奇，这就是我用来自动推进 BPF 的全部功能。

    private static void AdvanceBusinessProcessFlow(IOrganizationService service, ExtendedPluginContext context, Guid opportunityId)
    {
        // Retrieve all process instances
        RetrieveProcessInstancesRequest instanceRequest = new RetrieveProcessInstancesRequest
        {
            EntityId = opportunityId,
            EntityLogicalName = XrmOpportunity.EntityLogicalName
        };
        RetrieveProcessInstancesResponse instanceResponse = (RetrieveProcessInstancesResponse)service.Execute(instanceRequest);

        // First record is the active process instance
        Entity activeProcessInstance = instanceResponse.Processes.Entities[0];
        var activeProcessId = activeProcessInstance.Id;
        var activeStageId = new Guid(activeProcessInstance.Attributes["processstageid"].ToString());

        // Retrieve the process stages in the active path of the current process instance
        RetrieveActivePathRequest activePathRequest = new RetrieveActivePathRequest
        {
            ProcessInstanceId = activeProcessId
        };

        // System.ServiceModel.FaultException exception occurs here
        RetrieveActivePathResponse activePathResponse = (RetrieveActivePathResponse)service.Execute(activePathRequest);

        string activeStageName;
        int? activeStagePosition = null;
        int stageCount = activePathResponse.ProcessStages.Entities.Count;

        // Iterate through all process stages and identify active stage
        for (int i = 0; i < stageCount; i++)
        {
            if (activePathResponse.ProcessStages.Entities[i].Attributes["processstageid"].ToString() == activeStageId.ToString())
            {
                activeStageName = activePathResponse.ProcessStages.Entities[i].Attributes["stagename"].ToString();
                activeStagePosition = i;
            }
        }

        // If an active stage position is not identified, do nothing
        if (activeStagePosition == null)
        {
            throw new InvalidPluginExecutionException("No active stage of business process flow was identified!");
        }

        // Auto-advance active stages of BPF to last stage so that BPF can be auto-finished
        while (activeStagePosition < stageCount - 1)
        {
            // Retrieve the stage ID of the next stage to be set as the active stage
            var newActiveStageId = (Guid) activePathResponse.ProcessStages.Entities[(int) ++activeStagePosition].Attributes["processstageid"];

            // Retrieve the process instance record to update its active stage
            ColumnSet columnSet = new ColumnSet();
            columnSet.AddColumn("activestageid");
            Entity retrievedProcessInstance = service.Retrieve(dfnd_opportunitydispoprocess.EntityLogicalName, activeProcessId, columnSet);

            // Update active process stage
            retrievedProcessInstance["activestageid"] = new EntityReference(ProcessStage.EntityLogicalName, newActiveStageId);
            service.Update(retrievedProcessInstance);
        }
    }

Answer 1

在不满足 BPF 条件时定向到一个阶段，防止错误被抛出：

我仍然不知道为什么不为不满足 BPF 条件的机会返回 RetrieveActivePathResponse 对象。