.net之工作流工程展示及代码分享（二）工作流引擎

在介绍完表单类的时候，接下来介绍工作流引擎，主要由四个类组成，分别是流程、流程步骤、流程实例、流程步骤实例类。

流程类：

     [Serializable]
     public class Flow
     {
         [XmlAttribute]
         public Guid FlowId { get; set; }
         [XmlAttribute]
         public string FlowName { get; set; }
         public List<FlowStep> FlowSteps { get; set; }
         [XmlAttribute]
         public string FlowCategory { get; set; }
         [XmlAttribute]
         public bool Enabled { get; set; }
         [XmlAttribute]
         public DateTime CreateDate { get; set; }
         public Person Creator { get; set; }

         public DateTime? CanRequestDateStart { get; set; }

         public DateTime? CanRequestDateEnd { get; set; }

         public string CreaterName
         {
             get
             {
                 if(Creator!=null)
                 return Creator.PersonName;
                 return string.Empty;
             }
         }
         [XmlAttribute]
         public Guid FormId { get; set; }
         [XmlAttribute]
         public string FormName { get; set; }
         public WorkflowConstant.AccessMode AccessMode { get; set; }
         [XmlAttribute]
         public short PeriodTime { get; set; }
         [XmlAttribute]
         public string RequestRights { get; set; }
         [XmlAttribute]
         public string RequestGroup { get; set; }
         public string AccessModeDesc
         {
             get
             {
                 switch (RequestRights)
                 {
                     case "-不限-":
                         return "所有人";
                     default:
                         return RequestRights+": ";
                 }
             }
         }

         [XmlAttribute]
         public string RoleGroups {
             get
             {
                 if (!string.IsNullOrEmpty(RequestGroup))
                 {
                     return string.Join("、", RequestGroup.Split(',').Select(g => g.Split('|')[]));
                 }
                 else
                 {
                     return string.Empty;
                 }
             }
         }
     }

流程步骤类：

     [Serializable]
     public class FlowStep
     {
         [XmlAttribute]
         public Guid StepId { get; set; }
         [XmlAttribute]
         public Guid PreviousStepId { get; set; }
         [XmlAttribute]
         public Guid NextStepId { get; set; }
         [XmlAttribute]
         public int SequenceId { get; set; }
         [XmlAttribute]
         public string StepName { get; set; }
         [XmlAttribute]
         public string RightGroupTitle { get; set; }
         public List<Guid> CanWriteFormContolIds { get; set; }
         [XmlAttribute]
         public bool CanReturnToPreviousStep { get; set; }
         [XmlAttribute]
         public bool CanReturnToFirstStep { get; set; }
         [XmlAttribute]
         public bool AllowSelectAuditor { get; set; }
         public WorkflowConstant.CounterSignatureMode CounterSignatureMode { get; set; }
         [XmlAttribute]
         public bool IsStartStep { get; set; }
         [XmlAttribute]
         public bool IsLastStep { get; set; }
         [XmlAttribute]
         public bool CanUploadFile { get; set; }
         [XmlAttribute]
         public bool MustUploadFile { get; set; }
         [XmlAttribute]
         public int UploadFileCount { get; set; }
     }

流程实例类：

    [Serializable]
     public class FlowInstance
     {
         [XmlAttribute]
         public Guid FlowInstantId { get; set; }
         public Flow Flow { get; set; }

         public List<FlowInstanceStep> FlowStepInstances { get; set; }
         public Person Creator { get; set; }
         [XmlAttribute]
         public DateTime CreateDate { get; set; }
         [XmlAttribute]
         public DateTime LastDealDate { get; set; }
         [XmlAttribute]
         public WorkflowConstant.SignatureStatus FlowStatus { get; set; }

         public string FlowStatusName
         {
             get
             {
                 switch (FlowStatus)
                 {
                     case WorkflowConstant.SignatureStatus.Start:
                         return "进行中";
                         break;
                     case WorkflowConstant.SignatureStatus.Undeal:
                         return "未处理";
                         break;
                     case WorkflowConstant.SignatureStatus.PartialPassed:
                         return "部分通过";
                         break;
                     case WorkflowConstant.SignatureStatus.Passed:
                         return "通过";
                         break;
                     case WorkflowConstant.SignatureStatus.OutDated:
                         return "过期";
                         break;
                     case WorkflowConstant.SignatureStatus.Canceled:
                         return "取消";
                         break;
                     case WorkflowConstant.SignatureStatus.RejectToPreviousStep:
                         return "退回上一步";
                         break;
                     case WorkflowConstant.SignatureStatus.RejectToFirstStep:
                         return "退回第一步";
                         break;
                     case WorkflowConstant.SignatureStatus.Stopped:
                         return "停止";
                         break;
                     case WorkflowConstant.SignatureStatus.Finish:
                         return "结束";
                         break;
                     default:
                         return string.Empty;
                 }
             }
         }

         public DateTime? EndDate
         {
             get
             {
                 if (Flow != null)
                 {
                     return CreateDate.AddDays(Flow.PeriodTime);
                 }
                 else return null;
             }
         }

         public string CurrentStepDisplayName { get; set; }
     }

流程步骤实例类：

     [Serializable]
     public class FlowInstanceStep
     {
         [XmlAttribute]
         public Guid StepInstanceId { get; set; }
         public List<WorkflowPersonSignature> PersonSignatures { get; set; }

         public SerializableDictionary<Guid, string> WriteValues { get; set; }

         public FlowStep FlowStep { get; set; }
         [XmlAttribute]
         public DateTime CreateDate { get; set; }
         [XmlAttribute]
         public DateTime ProcessDate { get; set; }
         [XmlAttribute]
         public WorkflowConstant.SignatureStatus StepStatus { get; set; }
         public List<AttachFile> FileList { get; set; }
     }

这几个类使用了“贫血模型”

设定好流程和步骤，以后每次建立的流程实例都是从流程获取到的。

本系列导航：

1. .net之工作流工程展示及代码分享（预告）
2. .net之工作流工程展示及代码分享（一）工作流表单
3. .net之工作流工程展示及代码分享（二）工作流引擎
4. .net之工作流工程展示及代码分享（三）数据存储引擎
5. .net之工作流工程展示及代码分享（四）主控制类
6. .net之工作流工程展示及代码分享（五）前端交互