.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('|')[0]));
                }
                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