C#的Json操作类，支持数组，DataTable，DataReader等转Json

1using System;
2using System.Data;
3using System.Text;
4using System.Collections.Generic;
5using System.Reflection;
6using System.Data.Common;
7using System.Collections;
8using System.Web.UI.WebControls;
9using System.Web.UI.HtmlControls;
10using System.IO;
11using System.Text.RegularExpressions;
12using System.Runtime.Serialization.Json;
13
14
15namespace System.Common
16{
17    public static class Json
18    {
19        /// <summary>
20        /// List转成json 
21        /// </summary>
22        /// <typeparam name="T"></typeparam>
23        /// <param name="jsonName"></param>
24        /// <param name="list"></param>
25        /// <returns></returns>
26        public static string ListToJson<T>(IList<T> list, string jsonName)
27        {
28            StringBuilder Json = new StringBuilder();
29            if (string.IsNullOrEmpty(jsonName))
30                jsonName = list[0].GetType().Name;
31            Json.Append("{\"" + jsonName + "\":[");
32            if (list.Count > 0)
33            {
34                for (int i = 0; i < list.Count; i++)
35                {
36                    T obj = Activator.CreateInstance<T>();
37                    PropertyInfo[] pi = obj.GetType().GetProperties();
38                    Json.Append("{");
39                    for (int j = 0; j < pi.Length; j++)
40                    {
41                        Type type;
42                        object o = pi[j].GetValue(list[i], null);
43                        string v = string.Empty;
44                        if (o != null)
45                        {
46                            type = o.GetType();
47                            v = o.ToString();
48                        }
49                        else
50                        {
51                            type = typeof(string);
52                        }
53
54                        Json.Append("\"" + pi[j].Name.ToString() + "\":" + StringFormat(v, type));
55
56                        if (j < pi.Length - 1)
57                        {
58                            Json.Append(",");
59                        }
60                    }
61                    Json.Append("}");
62                    if (i < list.Count - 1)
63                    {
64                        Json.Append(",");
65                    }
66                }
67            }
68            Json.Append("]}");
69            return Json.ToString();
70        }
71
72        /// <summary>
73        /// 序列化集合对象
74        /// </summary>
75        public static string JsonSerializerByArrayData<T>(T[] tArray)
76        {
77            DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T[]));
78            MemoryStream ms = new MemoryStream();
79            ser.WriteObject(ms, tArray);
80            string jsonString = Encoding.UTF8.GetString(ms.ToArray());
81            ms.Close();
82            string p = @"\\/Date\((\d+)\+\d+\)\\/";
83            MatchEvaluator matchEvaluator = new MatchEvaluator(ConvertJsonDateToDateString);
84            Regex reg = new Regex(p);
85            jsonString = reg.Replace(jsonString, matchEvaluator);
86            return jsonString;
87        }
88
89        /// <summary>
90        /// 序列化单个对象
91        /// </summary>
92        public static string JsonSerializerBySingleData<T>(T t)
93        {
94            DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));
95            MemoryStream ms = new MemoryStream();
96            ser.WriteObject(ms, t);
97            string jsonString = Encoding.UTF8.GetString(ms.ToArray());
98            ms.Close();
99            string p = @"\\/Date\((\d+)\+\d+\)\\/";
100            MatchEvaluator matchEvaluator = new MatchEvaluator(ConvertJsonDateToDateString);
101            Regex reg = new Regex(p);
102            jsonString = reg.Replace(jsonString, matchEvaluator);
103            return jsonString;
104        }
105
106        /// <summary> 
107        /// 反序列化单个对象
108        /// </summary> 
109        public static T JsonDeserializeBySingleData<T>(string jsonString)
110        {
111            //将"yyyy-MM-dd HH:mm:ss"格式的字符串转为"\/Date(1294499956278+0800)\/"格式  
112            string p = @"\d{4}-\d{2}-\d{2}\s\d{2}:\d{2}:\d{2}";
113            MatchEvaluator matchEvaluator = new MatchEvaluator(ConvertDateStringToJsonDate);
114            Regex reg = new Regex(p);
115            jsonString = reg.Replace(jsonString, matchEvaluator);
116            DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));
117            MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonString));
118            T obj = (T)ser.ReadObject(ms);
119            return obj;
120        }
121
122        /// <summary> 
123        /// 反序列化集合对象
124        /// </summary> 
125        public static T[] JsonDeserializeByArrayData<T>(string jsonString)
126        {
127            //将"yyyy-MM-dd HH:mm:ss"格式的字符串转为"\/Date(1294499956278+0800)\/"格式  
128            string p = @"\d{4}-\d{2}-\d{2}\s\d{2}:\d{2}:\d{2}";
129            MatchEvaluator matchEvaluator = new MatchEvaluator(ConvertDateStringToJsonDate);
130            Regex reg = new Regex(p);
131            jsonString = reg.Replace(jsonString, matchEvaluator);
132            DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T[]));
133            MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonString));
134            T[] arrayObj = (T[])ser.ReadObject(ms);
135            return arrayObj;
136        }
137
138        /// <summary> 
139        /// 将Json序列化的时间由/Date(1294499956278+0800)转为字符串 
140        /// </summary> 
141        private static string ConvertJsonDateToDateString(Match m)
142        {
143            string result = string.Empty;
144            DateTime dt = new DateTime(1970, 1, 1);
145            dt = dt.AddMilliseconds(long.Parse(m.Groups[1].Value));
146            dt = dt.ToLocalTime();
147            result = dt.ToString("yyyy-MM-dd HH:mm:ss");
148            return result;
149        }
150
151        /// <summary>  
152        /// 将时间字符串转为Json时间 
153        /// </summary> 
154        private static string ConvertDateStringToJsonDate(Match m)
155        {
156            string result = string.Empty;
157            DateTime dt = DateTime.Parse(m.Groups[0].Value);
158            dt = dt.ToUniversalTime();
159            TimeSpan ts = dt - DateTime.Parse("1970-01-01");
160            result = string.Format("\\/Date({0}+0800)\\/", ts.TotalMilliseconds);
161            return result;
162        }
163
164        /// <summary>
165        /// List转成json 
166        /// </summary>
167        /// <typeparam name="T"></typeparam>
168        /// <param name="list"></param>
169        /// <returns></returns>
170        public static string ListToJson<T>(IList<T> list)
171        {
172            object obj = list[0];
173            return ListToJson<T>(list, obj.GetType().Name);
174        }
175
176        /// <summary> 
177        /// 对象转换为Json字符串 
178        /// </summary> 
179        /// <param name="jsonObject">对象</param> 
180        /// <returns>Json字符串</returns> 
181        public static string ToJson(object jsonObject)
182        {
183            try
184            {
185                StringBuilder jsonString = new StringBuilder();
186                jsonString.Append("{");
187                PropertyInfo[] propertyInfo = jsonObject.GetType().GetProperties();
188                for (int i = 0; i < propertyInfo.Length; i++)
189                {
190                    object objectValue = propertyInfo[i].GetGetMethod().Invoke(jsonObject, null);
191                    if (objectValue == null)
192                    {
193                        continue;
194                    }
195                    StringBuilder value = new StringBuilder();
196                    if (objectValue is DateTime || objectValue is Guid || objectValue is TimeSpan)
197                    {
198                        value.Append("\"" + objectValue.ToString() + "\"");
199                    }
200                    else if (objectValue is string)
201                    {
202                        value.Append("\"" + objectValue.ToString() + "\"");
203                    }
204                    else if (objectValue is IEnumerable)
205                    {
206                        value.Append(ToJson((IEnumerable)objectValue));
207                    }
208                    else
209                    {
210                        value.Append("\"" + objectValue.ToString() + "\"");
211                    }
212                    jsonString.Append("\"" + propertyInfo[i].Name + "\":" + value + ","); ;
213                }
214                return jsonString.ToString().TrimEnd(',') + "}";
215            }
216            catch (Exception ex)
217            {
218                throw ex;
219            }
220        }
221
222        /// <summary> 
223        /// 对象集合转换Json 
224        /// </summary> 
225        /// <param name="array">集合对象</param> 
226        /// <returns>Json字符串</returns> 
227        public static string ToJson(IEnumerable array)
228        {
229            string jsonString = "[";
230            foreach (object item in array)
231            {
232                jsonString += ToJson(item) + ",";
233            }
234            if (jsonString.Length > 1)
235            {
236                jsonString.Remove(jsonString.Length - 1, jsonString.Length);
237            }
238            else
239            {
240                jsonString = "[]";
241            }
242            return jsonString + "]";
243        }
244
245        /// <summary> 
246        /// 普通集合转换Json 
247        /// </summary> 
248        /// <param name="array">集合对象</param> 
249        /// <returns>Json字符串</returns> 
250        public static string ToArrayString(IEnumerable array)
251        {
252            string jsonString = "[";
253            foreach (object item in array)
254            {
255                jsonString = ToJson(item.ToString()) + ",";
256            }
257            jsonString.Remove(jsonString.Length - 1, jsonString.Length);
258            return jsonString + "]";
259        }
260
261        /// <summary> 
262        /// Datatable转换为Json 
263        /// </summary> 
264        /// <param name="table">Datatable对象</param> 
265        /// <returns>Json字符串</returns> 
266        public static string ToJson(DataTable dt)
267        {
268            StringBuilder jsonString = new StringBuilder();
269            jsonString.Append("[");
270            DataRowCollection drc = dt.Rows;
271            for (int i = 0; i < drc.Count; i++)
272            {
273                jsonString.Append("{");
274                for (int j = 0; j < dt.Columns.Count; j++)
275                {
276                    string strKey = dt.Columns[j].ColumnName;
277                    string strValue = drc[i][j].ToString();
278                    Type type = dt.Columns[j].DataType;
279                    jsonString.Append("\"" + strKey + "\":");
280                    strValue = StringFormat(strValue, type);
281                    if (j < dt.Columns.Count - 1)
282                    {
283                        jsonString.Append(strValue + ",");
284                    }
285                    else
286                    {
287                        jsonString.Append(strValue);
288                    }
289                }
290                jsonString.Append("},");
291            }
292            jsonString.Remove(jsonString.Length - 1, 1);
293            jsonString.Append("]");
294            if (jsonString.Length == 1)
295            {
296                return "[]";
297            }
298            return jsonString.ToString();
299        }
300
301        /// <summary>
302        /// DataTable转成Json 
303        /// </summary>
304        /// <param name="jsonName"></param>
305        /// <param name="dt"></param>
306        /// <returns></returns>
307        public static string ToJson(DataTable dt, string jsonName)
308        {
309            StringBuilder Json = new StringBuilder();
310            if (string.IsNullOrEmpty(jsonName))
311                jsonName = dt.TableName;
312            Json.Append("{\"" + jsonName + "\":[");
313            if (dt.Rows.Count > 0)
314            {
315                for (int i = 0; i < dt.Rows.Count; i++)
316                {
317                    Json.Append("{");
318                    for (int j = 0; j < dt.Columns.Count; j++)
319                    {
320                        Type type = dt.Rows[i][j].GetType();
321                        Json.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":" + StringFormat(dt.Rows[i][j] is DBNull ? string.Empty : dt.Rows[i][j].ToString(), type));
322                        if (j < dt.Columns.Count - 1)
323                        {
324                            Json.Append(",");
325                        }
326                    }
327                    Json.Append("}");
328                    if (i < dt.Rows.Count - 1)
329                    {
330                        Json.Append(",");
331                    }
332                }
333            }
334            Json.Append("]}");
335            return Json.ToString();
336        }
337
338        /// <summary> 
339        /// DataReader转换为Json 
340        /// </summary> 
341        /// <param name="dataReader">DataReader对象</param> 
342        /// <returns>Json字符串</returns> 
343        public static string ToJson(IDataReader dataReader)
344        {
345            try
346            {
347                StringBuilder jsonString = new StringBuilder();
348                jsonString.Append("[");
349
350                while (dataReader.Read())
351                {
352                    jsonString.Append("{");
353                    for (int i = 0; i < dataReader.FieldCount; i++)
354                    {
355                        Type type = dataReader.GetFieldType(i);
356                        string strKey = dataReader.GetName(i);
357                        string strValue = dataReader[i].ToString();
358                        jsonString.Append("\"" + strKey + "\":");
359                        strValue = StringFormat(strValue, type);
360                        if (i < dataReader.FieldCount - 1)
361                        {
362                            jsonString.Append(strValue + ",");
363                        }
364                        else
365                        {
366                            jsonString.Append(strValue);
367                        }
368                    }
369                    jsonString.Append("},");
370                }
371                if (!dataReader.IsClosed)
372                {
373                    dataReader.Close();
374                }
375                jsonString.Remove(jsonString.Length - 1, 1);
376                jsonString.Append("]");
377                if (jsonString.Length == 1)
378                {
379                    return "[]";
380                }
381                return jsonString.ToString();
382            }
383            catch (Exception ex)
384            {
385                throw ex;
386            }
387        }
388
389        /// <summary> 
390        /// DataSet转换为Json 
391        /// </summary> 
392        /// <param name="dataSet">DataSet对象</param> 
393        /// <returns>Json字符串</returns> 
394        public static string ToJson(DataSet dataSet)
395        {
396            string jsonString = "{";
397            foreach (DataTable table in dataSet.Tables)
398            {
399                jsonString += "\"" + table.TableName + "\":" + ToJson(table) + ",";
400            }
401            jsonString = jsonString.TrimEnd(',');
402            return jsonString + "}";
403        }
404
405        /// <summary>
406        /// 过滤特殊字符
407        /// </summary>
408        /// <param name="s"></param>
409        /// <returns></returns>
410        public static string String2Json(String s)
411        {
412            StringBuilder sb = new StringBuilder();
413            for (int i = 0; i < s.Length; i++)
414            {
415                char c = s.ToCharArray()[i];
416                switch (c)
417                {
418                    case '\"':
419                        sb.Append("\\\""); break;
420                    case '\\':
421                        sb.Append("\\\\"); break;
422                    case '/':
423                        sb.Append("\\/"); break;
424                    case '\b':
425                        sb.Append("\\b"); break;
426                    case '\f':
427                        sb.Append("\\f"); break;
428                    case '\n':
429                        sb.Append("\\n"); break;
430                    case '\r':
431                        sb.Append("\\r"); break;
432                    case '\t':
433                        sb.Append("\\t"); break;
434                    case '\v':
435                        sb.Append("\\v"); break;
436                    case '\0':
437                        sb.Append("\\0"); break;
438                    default:
439                        sb.Append(c); break;
440                }
441            }
442            return sb.ToString();
443        }
444
445        /// <summary>
446        /// 格式化字符型、日期型、布尔型
447        /// </summary>
448        /// <param name="str"></param>
449        /// <param name="type"></param>
450        /// <returns></returns>
451        private static string StringFormat(string str, Type type)
452        {
453            if (type != typeof(string) && string.IsNullOrEmpty(str))
454            {
455                str = "\"" + str + "\"";
456            }
457            else if (type == typeof(string))
458            {
459                str = String2Json(str);
460                str = "\"" + str + "\"";
461            }
462            else if (type == typeof(DateTime))
463            {
464                str = "\"" + str + "\"";
465            }
466            else if (type == typeof(bool))
467            {
468                str = str.ToLower();
469            }
470            else if (type == typeof(byte[]))
471            {
472                str = "\"" + str + "\"";
473            }else if(type==typeof(Guid))
474            {
475                str = "\"" + str + "\"";
476            }
477            return str;
478        }
479
480
481        public static void RegistAjax(HtmlHead Header, Type type)
482        {
483            string assemblyName = type.FullName + "," + type.Assembly.FullName.Substring(0, type.Assembly.FullName.IndexOf(","));
484            if (type.Assembly.FullName.StartsWith("App_Code."))
485            {
486                assemblyName = type.FullName + ",App_Code";
487            }
488            Literal l = new Literal();
489            l.Text = "\n<script type=\"text/javascript\" src=\"/ajaxpro/prototype.ashx\"></script>\n"
490            + "<script type=\"text/javascript\" src=\"/ajaxpro/core.ashx\"></script>\n"
491            + "<script type=\"text/javascript\" src=\"/ajaxpro/converter.ashx\"></script>\n"
492            + "<script type=\"text/javascript\" src=\"/ajaxpro/" + assemblyName + ".ashx\"></script>\n";
493            Header.Controls.Add(l);
494        }
495    }
496}