C#生成easyui tree-grid中的json字符串

  1     public class TreeUtil
  2     {
  3         public static string Json(List<Hashtable> dataList)
  4         {
  5             // 节点列表（映射表，用于临时存储节点对象）
  6             Hashtable nodeList = new Hashtable();
  7             // 将结果集存入映射表（后面将借助映射表构造多叉树）
  8             for (int i = 0; i < dataList.Count; i++)
  9             {
 10                 Hashtable dataRecord = dataList[i];
 11                 Node node = new Node();
 12                 node.menuid = (String)dataRecord["menuid"];
 13                 node.menuname = (String)dataRecord["text"];
 14                 node.parentId = (String)dataRecord["parentId"];
 15                 node.icon = (String)dataRecord["icon"];
 16                 node.url = (String)dataRecord["url"];
 17                 nodeList.Add(node.menuid, node);
 18             }
 19             // 根节点
 20             Node root = null;
 21             //构造无序的多叉树
 22             System.Collections.IDictionaryEnumerator enumerator = nodeList.GetEnumerator();
 23             while (enumerator.MoveNext())
 24             {
 25                 Node node = enumerator.Value as Node;
 26                 if (string.IsNullOrEmpty(node.parentId))
 27                 {
 28                     root = node;
 29                 }
 30                 else
 31                 {
 32                     ((Node)nodeList[node.parentId]).addChild(node);
 33                 }
 34             }
 35             return root.ToString();
 36         }
 37         /// <summary>
 38         /// 节点类
 39         /// </summary>
 40         class Node
 41         {
 42             //ID
 43             public String menuid;
 44 
 45             //Name
 46             public String menuname;
 47 
 48             //父项ID
 49             public String parentId;
 50 
 51             public String icon;
 52             public String url;
 53 
 54             //子项列表
 55             public List<Node> menus = new List<Node>();
 56 
 57             // 添加孩子节点
 58             public void addChild(Node node)
 59             {
 60                 menus.Add(node);
 61             }
 62 
 63             // 先序遍历，拼接JSON字符串
 64             public override String ToString()
 65             {
 66                 String result = "{\"" + "menuid\": \"" + menuid + "\"" + ",\"menuname\" : \"" + menuname + "\",";
 67                 if (string.IsNullOrEmpty(icon))
 68                 {
 69                     result += "\"icon\":\"icon-sys\",";
 70                 }
 71                 else
 72                 {
 73                     result += "\"icon\":\"" + icon + "\",";
 74                 }
 75                 if (!string.IsNullOrEmpty(url))
 76                 {
 77                     result += "\"url\":\"" + url + "\",";
 78                 }
 79                 if (menus.Count != 0)
 80                 {
 81                     result += "\"menus\" : [";
 82                     for (int i = 0; i < menus.Count; i++)
 83                     {
 84                         result += ((Node)menus[i]).ToString() + ",";
 85                     }
 86                     result = result.Substring(0, result.Length - 1);
 87                     result += "]";
 88                 }
 89                 else
 90                 {
 91                     result = result.Substring(0, result.Length - 1);  
 92                 }
 93                 return result + "}";
 94             }
 95 
 96             // 兄弟节点横向排序
 97             public void sortChildren()
 98             {
 99                 if (menus.Count != 0)
100                 {
101                     // 对本层节点进行排序（可根据不同的排序属性，传入不同的比较器，这里 传入ID比较器）
102                     menus.Sort(new NodeIDComparator());
103                     // 对每个节点的下一层节点进行排序            
104                     for (int i = 0; i < menus.Count; i++)
105                     {
106                         ((Node)menus[i]).sortChildren();
107                     }
108                 }
109             }
110 
111         }
112 
113         /// <summary>
114         /// 节点比较器(自定义排序规则)
115         /// </summary>
116         class NodeIDComparator : IComparer<Node>
117         {
118             // 按照节点编号比较
119 
120             int IComparer<Node>.Compare(Node o1, Node o2)
121             {
122                 int j1 = Convert.ToInt32(((Node)o1).menuid);
123                 int j2 = Convert.ToInt32(((Node)o2).menuid);
124                 return (j1 < j2 ? -1 : (j1 == j2 ? 0 : 1));
125             }
126         }
127 
128     }
129 
130 
131     /// <summary>
132     /// 虚拟获取数据库中的元数据
133     /// </summary>
134     class VirtualDataGenerator
135     {
136         // 构造无序的结果集列表，实际应用中，该数据应该从数据库中查询获得；
137         public static List<Hashtable> getVirtualResult()
138         {
139             List<Hashtable> dataList = new List<Hashtable>();
140 
141             Hashtable dataRecord1 = new Hashtable();
142             dataRecord1.Add("menuid", "112000");
143             dataRecord1.Add("text", "功能菜单1");
144             dataRecord1.Add("parentId", "110000");
145 
146             Hashtable dataRecord2 = new Hashtable();
147             dataRecord2.Add("menuid", "112200");
148             dataRecord2.Add("text", "子菜单1");
149             dataRecord2.Add("parentId", "112000");
150 
151             Hashtable dataRecord3 = new Hashtable();
152             dataRecord3.Add("menuid", "112100");
153             dataRecord3.Add("text", "子菜单2");
154             dataRecord3.Add("parentId", "112000");
155 
156             Hashtable dataRecord4 = new Hashtable();
157             dataRecord4.Add("menuid", "113000");
158             dataRecord4.Add("text", "测试1");
159             dataRecord4.Add("parentId", "110000");
160 
161             Hashtable dataRecord5 = new Hashtable();
162             dataRecord5.Add("menuid", "100000");
163             dataRecord5.Add("text", "测试2");
164             dataRecord5.Add("parentId", "");
165 
166             Hashtable dataRecord6 = new Hashtable();
167             dataRecord6.Add("menuid", "110000");
168             dataRecord6.Add("text", "测试3");
169             dataRecord6.Add("parentId", "100000");
170 
171             Hashtable dataRecord7 = new Hashtable();
172             dataRecord7.Add("menuid", "111000");
173             dataRecord7.Add("text", "测试4");
174             dataRecord7.Add("parentId", "110000");
175 
176             dataList.Add(dataRecord1);
177             dataList.Add(dataRecord2);
178             dataList.Add(dataRecord3);
179             dataList.Add(dataRecord4);
180             dataList.Add(dataRecord5);
181             dataList.Add(dataRecord6);
182             dataList.Add(dataRecord7);
183 
184             return dataList;
185         }
186     }