.net之工作流工程展示及代码分享（一）工作流表单

Workflow表单的作用是能够在客户端进行表单设计，然后在流程中动态开放哪些输入框可以供用户填写。

在这里我扩展了一个常用的WebEditor工具——KindEditor，能够插入自定义的html符号，如下图：

Form类如下：

     public delegate string SetAutoCompleteValue(string autoCompleteType);

     [Serializable]
     public class Form
     {
         [XmlAttribute]
         public Guid FormId { get; set; }
         [XmlAttribute]
         public string FormName { get; set; }
         [XmlAttribute]
         public string FormCategory { get; set; }
         [XmlAttribute]
         public string FormContent { get; set; }
         [XmlAttribute]
         public DateTime CreateDate { get; set; }
         public Person Creator { get; set; }

         public string CreaterName
         {
             get { return Creator != null ? Creator.PersonName : ""; }
         }

         public List<FormControl> FormControls { get; set; }

         public void InitializeFormControls()
         {
             if (!string.IsNullOrEmpty(FormContent))
             {
                 const string pattern = @"\<input(.*?)\/>";
                 var rx = new Regex(pattern);
                 var matches = rx.Matches(FormContent);
                 var formControls = new List<FormControl>();
                 foreach (Match match in matches)
                 {
                     string fieldLabel = Convert.ToString(match.Groups[]); //Group[0] :[xx],Group[1]: xx
                     string[] para = fieldLabel.Split(' ');

                     var values = para.First(s => s.Trim().ToLower()
                         .StartsWith("value=")).Replace("value=", "").Replace("\"", "");

                     string[] sArray = Regex.Split(values, "//", RegexOptions.IgnoreCase);

                     bool isNewControl = true;
                     string controlId = string.Empty;
                     if (para.Any(p => p.StartsWith("id=")))
                     {
                         isNewControl = false;
                         controlId = para.First(s => s.Trim().ToLower()
                             .StartsWith("id=")).Replace("id=", "").Replace("\"", "");
                     }

                     if (sArray.Count() >= ) //每个输入框表单至少要有三个以上属性
                     {
                         FormControl formControl ;
                         if (isNewControl)
                         {
                             switch (sArray[])
                             {
                                 case "单行":
                                     formControl = new TextLineFormControl();
                                     formControl.Width = int.Parse(sArray[]);
                                     break;
                                 case "多行":
                                     formControl = new MultiLineFormControl();
                                     formControl.Width = int.Parse(sArray[]);
                                     formControl.Height = int.Parse(sArray[]);
                                     break;
                                 case "单选":
                                     formControl = new RadioFormControl();
                                     formControl.InitialData = sArray[];
                                     break;
                                 case "多选":
                                     formControl = new CheckBoxFormControl();
                                     formControl.InitialData = sArray[];
                                     break;
                                 case "下拉":
                                     formControl = new DropDownFormControl();
                                     formControl.InitialData = sArray[];
                                     break;
                                 case "自动":
                                     formControl = new AutoCompleteFormControl();
                                     formControl.InitialData = sArray[];
                                     break;
                                 default:
                                     formControl = new UnknowFormControl();
                                     break;
                             }
                             formControl.FieldName = sArray[];
                             formControl.ControlId = Guid.NewGuid();

                         }
                         else
                         {
                             formControl = FormControls.Single(f => f.ControlId == Guid.Parse(controlId));
                             switch (sArray[])
                             {
                                 case "单行":
                                     formControl.Width = int.Parse(sArray[]);
                                     break;
                                 case "多行":
                                     formControl.Width = int.Parse(sArray[]);
                                     formControl.Height = int.Parse(sArray[]);
                                     break;
                                 case "单选":
                                     formControl.InitialData = sArray[];
                                     break;
                                 case "多选":
                                     formControl.InitialData = sArray[];
                                     break;
                                 case "下拉":
                                     formControl.InitialData = sArray[];
                                     break;
                                 case "自动":
                                     formControl.InitialData = sArray[];
                                     break;
                                 default:
                                     break;
                             }
                         }

                         formControls.Add(formControl);
                         FormContent = FormContent.Replace(match.Value,
                             string.Format("{{{0}}}", formControl.ControlId));
                     }

                 }
                 FormControls = formControls;
                 FormContent = FormContent;
             }
         }

         public string GetOccupyContentString()
         {
             var str = FormContent;
             foreach (var formControl in FormControls)
             {
                 str = str.Replace(string.Format("{{{0}}}", formControl.ControlId), formControl.GetDesignString());
             }
             return str;
         }

         public string GetPreviewContentString()
         {
             var str = FormContent;

             foreach (var formControl in FormControls)
             {
                 str = str.Replace(string.Format("{{{0}}}", formControl.ControlId), formControl.GetInputString());
             }
             return str;
         }

         public string GetPreviewContentString(Dictionary<Guid, string> writedValues)
         {
             var str = FormContent;

             foreach (var formControl in FormControls)
             {
                 string value = null;
                 if (writedValues != null && writedValues.TryGetValue(formControl.ControlId, out value))
                 {
                     str = str.Replace(string.Format("{{{0}}}", formControl.ControlId), value);
                 }
                 else
                 {
                     str = str.Replace(string.Format("{{{0}}}", formControl.ControlId), string.Empty);
                 }
             }
             return str;
         }

         public string GetDisplayContent(List<Guid> canWriteformControlIds, SetAutoCompleteValue autoCompleteValue, Dictionary<Guid, string> writedValues = null)
         {
             var str = FormContent;

             foreach (var formControl in FormControls)
             {
                 if (canWriteformControlIds.Contains(formControl.ControlId))
                 {
                     string value = null;
                     if (writedValues != null && writedValues.TryGetValue(formControl.ControlId, out value))
                     {
                         formControl.FieldValue = value;
                     }
                     if (string.IsNullOrEmpty(value) && formControl is AutoCompleteFormControl &&
                         !string.IsNullOrEmpty(formControl.InitialData) && autoCompleteValue != null)
                     {
                         formControl.FieldValue = autoCompleteValue(formControl.InitialData);
                     }
                     str = str.Replace(string.Format("{{{0}}}", formControl.ControlId), formControl.GetInputString());
                 }
                 else
                 {
                     string value = string.Empty;
                     if (writedValues != null && writedValues.TryGetValue(formControl.ControlId, out value))
                     {
                         formControl.FieldValue = value;
                     }
                     str = str.Replace(string.Format("{{{0}}}", formControl.ControlId), value);
                 }
             }
             return str;
         }
     }

[Serializable]标识是为了能序列化类；

[XmlAttribute]是为了在持久化保存到数据库的时候使用XML特性，节约保存控件，便于查询操作。

InitializeFormControls：从编辑器中读入的代码进行初始化；

其它的方法基本用于前台呈现。

FormControl类如下：

基类：

     [Serializable]
     [XmlInclude(typeof(TextLineFormControl))]
     [XmlInclude(typeof(MultiLineFormControl))]
     [XmlInclude(typeof(RadioFormControl))]
     [XmlInclude(typeof(CheckBoxFormControl))]
     [XmlInclude(typeof(DropDownFormControl))]
     [XmlInclude(typeof(AutoCompleteFormControl))]
     [XmlInclude(typeof(UnknowFormControl))]
     public abstract class FormControl
     {
         [XmlAttribute]
         public Guid ControlId { get; set; }
         [XmlAttribute]
         public string FieldName { get; set; }
         [XmlAttribute]
         public string FieldValue { get; set; }
         [XmlAttribute]
         public int Width { get; set; }
         [XmlAttribute]
         public int Height { get; set; }
         [XmlAttribute]
         public string ToolTip { get; set; }
         [XmlAttribute]
         public bool Required { get; set; }
         [XmlAttribute]
         public bool CanWrite { get; set; }
         [XmlAttribute]
         public string InitialData { get; set; }
         public abstract string GetDesignString();
         public abstract string GetInputString();
     }

[XmlInclude(typeof(TextLineFormControl))]..... 为了持久化时能够将派生类兼容存储；

GetDesignString：在设计器里呈现的方式；

GetInputString：在让用户输入时呈现的代码。

几个派生类：

     [Serializable]
     public class TextLineFormControl : FormControl
     {
         public override string GetDesignString()
         {
             return string.Format("<input type=\"text\" value=\"{0}//{1}//{2}\" style=\"{3}\" id=\"{4}\">",
                 WorkflowConstant.TextBoxFormControlName, FieldName, Width, WorkflowConstant.ControlDesignWidth,ControlId);
         }

         public override string GetInputString()
         {
             return string.Format("<input type=\"text\" value=\"{0}\" id=\"{1}\" size=\"{2}\" maxlength=\"{2}\" name=\"{1}\" >",
                 FieldValue, ControlId, Width);
         }
     }

     [Serializable]
     public class MultiLineFormControl : FormControl
     {
         public override string GetDesignString()
         {
             return string.Format("<input type=\"text\" value=\"{0}//{1}//{2}//{5}\" style=\"{3}\" id=\"{4}\">",
                 WorkflowConstant.TextAreaFormControlName, FieldName, Width, WorkflowConstant.ControlDesignWidth, ControlId, Height);
         }

         public override string GetInputString()
         {
             return string.Format("<textarea cols=\"{2}\" rows=\"{3}\" id=\"{1}\" name=\"{1}\" >{0}</textarea>",
                 FieldValue != null ? FieldValue.Replace("<br/>", "\n\r") : string.Empty, ControlId, Width, Height);
         }
     }

     [Serializable]
     public class RadioFormControl : FormControl
     {
         public override string GetDesignString()
         {
             return string.Format("<input type=\"text\" value=\"{0}//{1}//{2}\" style=\"{3}\" id=\"{4}\">",
                 WorkflowConstant.RadioFormControlName, FieldName, InitialData, WorkflowConstant.ControlDesignWidth, ControlId);
         }

         public override string GetInputString()
         {
             StringBuilder sb= new StringBuilder();
             var data = InitialData.Split('|');
             for (int i = ; i < data.Length; i ++)
             {
                 sb.AppendFormat("<input type=\"radio\" name=\"{0}\" id=\"{0}-{1}\" value=\"{2}\" {3}/>", ControlId, i,
                     data[i], FieldValue == data[i] ? " checked=\"checked\"" : string.Empty);
                 sb.AppendFormat("<label for=\"{0}-{1}\">{2}</label>", ControlId, i, data[i]);
             }
             return sb.ToString();
         }
     }
 .........

Form类使用InitializeFormControls方法生成各种实例化控件，放在FormControls字段里。

这两个类使用的基本上是领域模型。

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