在 C# 插件中更改业务流程阶段

我正在关注this https://msdn.microsoft.com/en-us/library/dn481586.aspx#Server-side%20programmability%20support%20for%20business%20process%20flow文章在 C# 插件中更改我的业务流程阶段。我可以将阶段移至下一个阶段，但当我尝试返回到上一个阶段时收到错误。下面的错误是我在 UI 中从 Dynamics 收到的错误。当我调试插件时，我收到一个FaultException<OrganizationServiceFault>不包含任何信息的异常。为什么我会收到错误？如何修改代码以成功返回到业务流程的上一阶段？

Error

Unhandled Exception: System.ServiceModel.FaultException`1[[Microsoft.Xrm.Sdk.OrganizationServiceFault, Microsoft.Xrm.Sdk, Version=8.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]: An unexpected error occurred.
Detail: <OrganizationServiceFault xmlns="http://schemas.microsoft.com/xrm/2011/Contracts" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
  <ActivityId>5df51362-b7c1-4817-a8d0-de2d63b15c17</ActivityId>
  <ErrorCode>-2147220970</ErrorCode>
  <ErrorDetails xmlns:a="http://schemas.datacontract.org/2004/07/System.Collections.Generic" />
  <Message>An unexpected error occurred.</Message>
  <Timestamp>2018-07-19T18:55:42.6625925Z</Timestamp>
  <ExceptionSource i:nil="true" />
  <InnerFault>
    <ActivityId>5df51362-b7c1-4817-a8d0-de2d63b15c17</ActivityId>
    <ErrorCode>-2147220970</ErrorCode>
    <ErrorDetails xmlns:a="http://schemas.datacontract.org/2004/07/System.Collections.Generic" />
    <Message>System.NullReferenceException: Microsoft Dynamics CRM has experienced an error. Reference number for administrators or support: #0D309052</Message>
    <Timestamp>2018-07-19T18:55:42.6625925Z</Timestamp>
    <ExceptionSource i:nil="true" />
    <InnerFault i:nil="true" />
    <OriginalException i:nil="true" />
    <TraceText i:nil="true" />
  </InnerFault>
  <OriginalException i:nil="true" />
  <TraceText i:nil="true" />
</OrganizationServiceFault>

Plugin

if (localContext == null)
{
    throw new ArgumentNullException("localContext");
}

IPluginExecutionContext context = localContext.PluginExecutionContext;
IOrganizationService service = localContext.OrganizationService;

Client client = (Client)service.Retrieve(
    Client.LogicalName,
    new Guid("75FE165F-848B-E811-80F3-005056B33317"),
    new ColumnSet(new String[]{
        Client.Properties.ClientId
    })
);

client.ChangeStage(service);

改变阶段

public void ChangeStage(IOrganizationService service)
{
    // Get Process Instances
    RetrieveProcessInstancesRequest processInstanceRequest = new RetrieveProcessInstancesRequest
    {
        EntityId = this.Id,
        EntityLogicalName = this.LogicalName
    };

    RetrieveProcessInstancesResponse processInstanceResponse = (RetrieveProcessInstancesResponse)service.Execute(processInstanceRequest);

    // Declare variables to store values returned in response
    int processCount = processInstanceResponse.Processes.Entities.Count;
    Entity activeProcessInstance = processInstanceResponse.Processes.Entities[0]; // First record is the active process instance
    Guid activeProcessInstanceID = activeProcessInstance.Id; // Id of the active process instance, which will be used later to retrieve the active path of the process instance

    // Retrieve the active stage ID of in the active process instance
    Guid activeStageID = new Guid(activeProcessInstance.Attributes["processstageid"].ToString());

    // Retrieve the process stages in the active path of the current process instance
    RetrieveActivePathRequest pathReq = new RetrieveActivePathRequest
    {
        ProcessInstanceId = activeProcessInstanceID
    };
    RetrieveActivePathResponse pathResp = (RetrieveActivePathResponse)service.Execute(pathReq);

    string activeStageName = "";
    int activeStagePosition = -1;

    Console.WriteLine("\nRetrieved stages in the active path of the process instance:");
    for (int i = 0; i < pathResp.ProcessStages.Entities.Count; i++)
    {
        // Retrieve the active stage name and active stage position based on the activeStageId for the process instance
        if (pathResp.ProcessStages.Entities[i].Attributes["processstageid"].ToString() == activeStageID.ToString())
        {
            activeStageName = pathResp.ProcessStages.Entities[i].Attributes["stagename"].ToString();
            activeStagePosition = i;
        }
    }

    // Retrieve the stage ID of the next stage that you want to set as active
    activeStageID = (Guid)pathResp.ProcessStages.Entities[activeStagePosition - 1].Attributes["processstageid"];

    // Retrieve the process instance record to update its active stage
    ColumnSet cols1 = new ColumnSet();
    cols1.AddColumn("activestageid");
    Entity retrievedProcessInstance = service.Retrieve("ccseq_bpf_clientsetup", activeProcessInstanceID, cols1);

    // Set the next stage as the active stage
    retrievedProcessInstance["activestageid"] = new EntityReference(ProcessStage.LogicalName, activeStageID);
    service.Update(retrievedProcessInstance);
}

Update

I found this https://learn.microsoft.com/en-us/dynamics365/customer-engagement/developer/model-business-process-flows#stage-navigation介绍如何使用 Web API 更新舞台的文章。当我尝试这个方法时，我收到错误：

未声明的属性“activestageid”，在有效负载中仅具有属性注释，但在有效负载中未找到属性值。在 OData 中，只有声明的导航属性和声明的命名流可以表示为不带值的属性。

我尝试了几种“activestageid”但没有成功（ActiveStageId、_activestageid_value）。

Update 2

根据 Arun 的反馈，我尝试了以下 Web API 调用，但没有成功。 url 括号内的 ID (ccseq_bpf_clientsetups(###)) 我从 ccseq_bpf_clientsetups 表上的 BusinessProcessFlowInstanceId 中提取。我从 ProcessStageBase 表中的 ProcessStageId 中提取的 processstages ID

// Attempt 1
PATCH /COHEN/api/data/v8.2/ccseq_bpf_clientsetups(bc892aec-2594-e811-80f4-005056b33317) HTTP/1.1
{ "[email protected] /cdn-cgi/l/email-protection": "/processstages(70018854-db7c-4612-915b-2ad7870a8574)"}

// Attempt 2
PATCH /COHEN/api/data/v8.2/ccseq_bpf_clientsetups(bc892aec-2594-e811-80f4-005056b33317) HTTP/1.1
{ "[email protected] /cdn-cgi/l/email-protection": "/processstages(70018854-db7c-4612-915b-2ad7870a8574)"}

// Attempt 3
PATCH /COHEN/api/data/v8.2/ccseq_bpf_clientsetups(bc892aec-2594-e811-80f4-005056b33317) HTTP/1.1
{ "[email protected] /cdn-cgi/l/email-protection": "/processstages(70018854-db7c-4612-915b-2ad7870a8574)"}

Update 3

我下载了 jLatimer 的 CRM Rest Builder 并尝试运行他的工具生成的 JavaScript。该代码与我之前编写的代码相同，但不幸的是不起作用。目前，我相当有信心 Web API v8.2 不支持更改阶段。

我有一些代码试图移动业务流程阶段forward，作为自定义工作流程步骤（而不是插件）。我已经在下面发布了。

我看到的区别是：

• 我正在前进（而不是后退）
• 我可能没有遵循最佳实践:)
• 我没有检索active path，我只是获取该过程的所有可用阶段
• 我也在设置TraversedPath财产

Code:

var activeInstancesRequest = new RetrieveProcessInstancesRequest
{
    EntityId          = TargetEntity.Id,
    EntityLogicalName = TargetEntity.LogicalName
};
var activeInstancesResponse = (RetrieveProcessInstancesResponse)base.OrgService.Execute(activeInstancesRequest);
var process = activeInstancesResponse.Processes.Entities.Select(x => x.ToEntity<BusinessProcessFlowInstance>()).ToList();
var stages = base.XrmContext.ProcessStageSet
    .Where(s => s.ProcessId.Id == process.FirstOrDefault().ProcessId.Id)
    .Select(s => new ProcessStage
    {
        ProcessStageId = s.ProcessStageId,
        StageName = s.StageName
    })
    .ToList();

var targetStage = stages.Where(stage => stage.StageName == targetStageName).FirstOrDefault();
if (targetStage != null)
{
    crmWorkflowContext.Trace($"BPF contains target stage (\"{targetStageName}\"). Attempting to update BPF");

    // Setting the Traversed Path is necessary for the Business Process Flow to show the active Stage
    // If this is not updated then although the new Stage is set as current, the previous Stage remains actively selected
    var traversedPath = $"{bpf.TraversedPath},{targetStage.ProcessStageId.Value}";
    var update = new BusinessProcessFlowInstance()
    {
        BusinessProcessFlowInstanceId = bpf.BusinessProcessFlowInstanceId,
        ProcessStageId                = targetStage.ProcessStageId,
        TraversedPath                 = traversedPath   
    };

    xrmContext.Attach(update);
    xrmContext.UpdateObject(update);
}