.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：

  1     public delegate string SetAutoCompleteValue(string autoCompleteType);
  2 
  3     [Serializable]
  4     public class Form
  5     {
  6         [XmlAttribute]
  7         public Guid FormId { get; set; }
  8         [XmlAttribute]
  9         public string FormName { get; set; }
 10         [XmlAttribute]
 11         public string FormCategory { get; set; }
 12         [XmlAttribute]
 13         public string FormContent { get; set; }
 14         [XmlAttribute]
 15         public DateTime CreateDate { get; set; }
 16         public Person Creator { get; set; }
 17 
 18 
 19         public string CreaterName
 20         {
 21             get { return Creator != null ? Creator.PersonName : ""; }
 22         }
 23 
 24         public List<FormControl> FormControls { get; set; }
 25 
 26         public void InitializeFormControls()
 27         {
 28             if (!string.IsNullOrEmpty(FormContent))
 29             {
 30                 const string pattern = @"<input(.*?)/>";
 31                 var rx = new Regex(pattern);
 32                 var matches = rx.Matches(FormContent);
 33                 var formControls = new List<FormControl>();
 34                 foreach (Match match in matches)
 35                 {
 36                     string fieldLabel = Convert.ToString(match.Groups[0]); //Group[0] :[xx],Group[1]: xx
 37                     string[] para = fieldLabel.Split(' ');
 38 
 39                     var values = para.First(s => s.Trim().ToLower()
 40                         .StartsWith("value=")).Replace("value=", "").Replace(""", "");
 41 
 42                     string[] sArray = Regex.Split(values, "//", RegexOptions.IgnoreCase);
 43 
 44                     bool isNewControl = true;
 45                     string controlId = string.Empty;
 46                     if (para.Any(p => p.StartsWith("id=")))
 47                     {
 48                         isNewControl = false;
 49                         controlId = para.First(s => s.Trim().ToLower()
 50                             .StartsWith("id=")).Replace("id=", "").Replace(""", "");
 51                     }
 52 
 53                     if (sArray.Count() >= 3) //每个输入框表单至少要有三个以上属性
 54                     {
 55                         FormControl formControl ;
 56                         if (isNewControl)
 57                         {
 58                             switch (sArray[0])
 59                             {
 60                                 case "单行":
 61                                     formControl = new TextLineFormControl();
 62                                     formControl.Width = int.Parse(sArray[2]);
 63                                     break;
 64                                 case "多行":
 65                                     formControl = new MultiLineFormControl();
 66                                     formControl.Width = int.Parse(sArray[2]);
 67                                     formControl.Height = int.Parse(sArray[3]);
 68                                     break;
 69                                 case "单选":
 70                                     formControl = new RadioFormControl();
 71                                     formControl.InitialData = sArray[2];
 72                                     break;
 73                                 case "多选":
 74                                     formControl = new CheckBoxFormControl();
 75                                     formControl.InitialData = sArray[2];
 76                                     break;
 77                                 case "下拉":
 78                                     formControl = new DropDownFormControl();
 79                                     formControl.InitialData = sArray[2];
 80                                     break;
 81                                 case "自动":
 82                                     formControl = new AutoCompleteFormControl();
 83                                     formControl.InitialData = sArray[2];
 84                                     break;
 85                                 default:
 86                                     formControl = new UnknowFormControl();
 87                                     break;
 88                             }
 89                             formControl.FieldName = sArray[1];
 90                             formControl.ControlId = Guid.NewGuid();
 91 
 92                         }
 93                         else
 94                         {
 95                             formControl = FormControls.Single(f => f.ControlId == Guid.Parse(controlId));
 96                             switch (sArray[0])
 97                             {
 98                                 case "单行":
 99                                     formControl.Width = int.Parse(sArray[2]);
100                                     break;
101                                 case "多行":
102                                     formControl.Width = int.Parse(sArray[2]);
103                                     formControl.Height = int.Parse(sArray[3]);
104                                     break;
105                                 case "单选":
106                                     formControl.InitialData = sArray[2];
107                                     break;
108                                 case "多选":
109                                     formControl.InitialData = sArray[2];
110                                     break;
111                                 case "下拉":
112                                     formControl.InitialData = sArray[2];
113                                     break;
114                                 case "自动":
115                                     formControl.InitialData = sArray[2];
116                                     break;
117                                 default:
118                                     break;
119                             }
120                         }
121 
122                         formControls.Add(formControl);
123                         FormContent = FormContent.Replace(match.Value,
124                             string.Format("{{{0}}}", formControl.ControlId));
125                     }
126 
127                 }
128                 FormControls = formControls;
129                 FormContent = FormContent;
130             }
131         }
132 
133         public string GetOccupyContentString()
134         {
135             var str = FormContent;
136             foreach (var formControl in FormControls)
137             {
138                 str = str.Replace(string.Format("{{{0}}}", formControl.ControlId), formControl.GetDesignString());
139             }
140             return str;
141         }
142 
143         public string GetPreviewContentString()
144         {
145             var str = FormContent;
146 
147             foreach (var formControl in FormControls)
148             {
149                 str = str.Replace(string.Format("{{{0}}}", formControl.ControlId), formControl.GetInputString());
150             }
151             return str;
152         }
153 
154         public string GetPreviewContentString(Dictionary<Guid, string> writedValues)
155         {
156             var str = FormContent;
157 
158             foreach (var formControl in FormControls)
159             {
160                 string value = null;
161                 if (writedValues != null && writedValues.TryGetValue(formControl.ControlId, out value))
162                 {
163                     str = str.Replace(string.Format("{{{0}}}", formControl.ControlId), value);
164                 }
165                 else
166                 {
167                     str = str.Replace(string.Format("{{{0}}}", formControl.ControlId), string.Empty);
168                 }
169             }
170             return str;
171         }
172 
173         public string GetDisplayContent(List<Guid> canWriteformControlIds, SetAutoCompleteValue autoCompleteValue, Dictionary<Guid, string> writedValues = null)
174         {
175             var str = FormContent;
176 
177             foreach (var formControl in FormControls)
178             {
179                 if (canWriteformControlIds.Contains(formControl.ControlId))
180                 {
181                     string value = null;
182                     if (writedValues != null && writedValues.TryGetValue(formControl.ControlId, out value))
183                     {
184                         formControl.FieldValue = value;
185                     }
186                     if (string.IsNullOrEmpty(value) && formControl is AutoCompleteFormControl &&
187                         !string.IsNullOrEmpty(formControl.InitialData) && autoCompleteValue != null)
188                     {
189                         formControl.FieldValue = autoCompleteValue(formControl.InitialData);
190                     }
191                     str = str.Replace(string.Format("{{{0}}}", formControl.ControlId), formControl.GetInputString());
192                 }
193                 else
194                 {
195                     string value = string.Empty;
196                     if (writedValues != null && writedValues.TryGetValue(formControl.ControlId, out value))
197                     {
198                         formControl.FieldValue = value;
199                     }
200                     str = str.Replace(string.Format("{{{0}}}", formControl.ControlId), value);
201                 }
202             }
203             return str;
204         }
205     }

View Code

[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：

 1     [Serializable]
 2     [XmlInclude(typeof(TextLineFormControl))]
 3     [XmlInclude(typeof(MultiLineFormControl))]
 4     [XmlInclude(typeof(RadioFormControl))]
 5     [XmlInclude(typeof(CheckBoxFormControl))]
 6     [XmlInclude(typeof(DropDownFormControl))]
 7     [XmlInclude(typeof(AutoCompleteFormControl))]
 8     [XmlInclude(typeof(UnknowFormControl))]
 9     public abstract class FormControl
10     {
11         [XmlAttribute]
12         public Guid ControlId { get; set; }
13         [XmlAttribute]
14         public string FieldName { get; set; }
15         [XmlAttribute]
16         public string FieldValue { get; set; }
17         [XmlAttribute]
18         public int Width { get; set; }
19         [XmlAttribute]
20         public int Height { get; set; }
21         [XmlAttribute]
22         public string ToolTip { get; set; }
23         [XmlAttribute]
24         public bool Required { get; set; }
25         [XmlAttribute]
26         public bool CanWrite { get; set; }
27         [XmlAttribute]
28         public string InitialData { get; set; }
29         public abstract string GetDesignString();
30         public abstract string GetInputString();
31     }

View Code

[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：

 1     [Serializable]
 2     public class TextLineFormControl : FormControl
 3     {
 4         public override string GetDesignString()
 5         {
 6             return string.Format("<input type="text" value="{0}//{1}//{2}" style="{3}" id="{4}">",
 7                 WorkflowConstant.TextBoxFormControlName, FieldName, Width, WorkflowConstant.ControlDesignWidth,ControlId);
 8         }
 9 
10         public override string GetInputString()
11         {
12             return string.Format("<input type="text" value="{0}" id="{1}" size="{2}" maxlength="{2}" name="{1}" >",
13                 FieldValue, ControlId, Width);
14         }
15     }
16 
17     [Serializable]
18     public class MultiLineFormControl : FormControl
19     {
20         public override string GetDesignString()
21         {
22             return string.Format("<input type="text" value="{0}//{1}//{2}//{5}" style="{3}" id="{4}">",
23                 WorkflowConstant.TextAreaFormControlName, FieldName, Width, WorkflowConstant.ControlDesignWidth, ControlId, Height);
24         }
25 
26         public override string GetInputString()
27         {
28             return string.Format("<textarea cols="{2}" rows="{3}" id="{1}" name="{1}" >{0}</textarea>",
29                 FieldValue != null ? FieldValue.Replace("<br/>", "

") : string.Empty, ControlId, Width, Height);
30         }
31     }
32 
33     [Serializable]
34     public class RadioFormControl : FormControl
35     {
36         public override string GetDesignString()
37         {
38             return string.Format("<input type="text" value="{0}//{1}//{2}" style="{3}" id="{4}">",
39                 WorkflowConstant.RadioFormControlName, FieldName, InitialData, WorkflowConstant.ControlDesignWidth, ControlId);
40         }
41 
42         public override string GetInputString()
43         {
44             StringBuilder sb= new StringBuilder();
45             var data = InitialData.Split('|');
46             for (int i = 0; i < data.Length; i ++)
47             {
48                 sb.AppendFormat("<input type="radio" name="{0}" id="{0}-{1}" value="{2}" {3}/>", ControlId, i,
49                     data[i], FieldValue == data[i] ? " checked="checked"" : string.Empty);
50                 sb.AppendFormat("<label for="{0}-{1}">{2}</label>", ControlId, i, data[i]);
51             }
52             return sb.ToString();
53         }
54     }
55 .........

View Code

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。

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