C#通用JSON操作类

 using System;
 using System.Data;
 using System.Text;
 using System.Collections.Generic;
 using System.Reflection;
 using System.Data.Common;
 using System.Collections;
 using System.IO;
 using System.Text.RegularExpressions;
 using System.Runtime.Serialization.Json;


 namespace ZZUdp.Tool
 {
     public static class JsonHepler
     {
         ///
         /// List转成json
         ///
         ///
         ///
         ///
         ///
         public static string ListToJson(IList list, string jsonName)
         {
             StringBuilder Json = new StringBuilder();
             if (string.IsNullOrEmpty(jsonName))
                 jsonName = list[0].GetType().Name;
             Json.Append("{\"" + jsonName + "\":[");
             if (list.Count > 0)
             {
                 for (int i = 0; i < list.Count; i++)
                 {
                     T obj = Activator.CreateInstance();
                     PropertyInfo[] pi = obj.GetType().GetProperties();
                     Json.Append("{");
                     for (int j = 0; j < pi.Length; j++)
                     {
                         Type type;
                         object o = pi[j].GetValue(list[i], null);
                         string v = string.Empty;
                         if (o != null)
                         {
                             type = o.GetType();
                             v = o.ToString();
                         }
                         else
                         {
                             type = typeof(string);
                         }

                         Json.Append("\"" + pi[j].Name.ToString() + "\":" + StringFormat(v, type));

                         if (j < pi.Length - 1)
                         {
                             Json.Append(",");
                         }
                     }
                     Json.Append("}");
                     if (i < list.Count - 1)
                     {
                         Json.Append(",");
                     }
                 }
             }
             Json.Append("]}");
             return Json.ToString();
         }

         ///
         /// 序列化集合对象
         ///
         public static string JsonSerializerByArrayData(T[] tArray)
         {
             DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T[]));
             MemoryStream ms = new MemoryStream();
             ser.WriteObject(ms, tArray);
             string jsonString = Encoding.UTF8.GetString(ms.ToArray());
             ms.Close();
             string p = @"\\/Date(\d+)\+\d+\\/";
             MatchEvaluator matchEvaluator = new MatchEvaluator(ConvertJsonDateToDateString);
             Regex reg = new Regex(p);
             jsonString = reg.Replace(jsonString, matchEvaluator);
             return jsonString;
         }

         ///
         /// 序列化单个对象
         ///
         public static string JsonSerializerBySingleData(T t)
         {
             DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));
             MemoryStream ms = new MemoryStream();
             ser.WriteObject(ms, t);
             string jsonString = Encoding.UTF8.GetString(ms.ToArray());
             ms.Close();
             string p = @"\\/Date(\d+)\+\d+\\/";
             MatchEvaluator matchEvaluator = new MatchEvaluator(ConvertJsonDateToDateString);
             Regex reg = new Regex(p);
             jsonString = reg.Replace(jsonString, matchEvaluator);
             return jsonString;
         }

         ///
         /// 反序列化单个对象
         ///
         public static T JsonDeserializeBySingleData(string jsonString)
         {
             //将"yyyy-MM-dd HH:mm:ss"格式的字符串转为"\/Date(1294499956278+0800)\/"格式
             string p = @"\d{4}-\d{2}-\d{2}\s\d{2}:\d{2}:\d{2}";
             MatchEvaluator matchEvaluator = new MatchEvaluator(ConvertDateStringToJsonDate);
             Regex reg = new Regex(p);
             jsonString = reg.Replace(jsonString, matchEvaluator);
             DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));
             MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonString));
             T obj = (T)ser.ReadObject(ms);
             return obj;
         }

         ///
         /// 反序列化集合对象
         ///
         public static T[] JsonDeserializeByArrayData(string jsonString)
         {
             //将"yyyy-MM-dd HH:mm:ss"格式的字符串转为"\/Date(1294499956278+0800)\/"格式
             string p = @"\d{4}-\d{2}-\d{2}\s\d{2}:\d{2}:\d{2}";
             MatchEvaluator matchEvaluator = new MatchEvaluator(ConvertDateStringToJsonDate);
             Regex reg = new Regex(p);
             jsonString = reg.Replace(jsonString, matchEvaluator);
             DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T[]));
             MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonString));
             T[] arrayObj = (T[])ser.ReadObject(ms);
             return arrayObj;
         }

         ///
         /// 将Json序列化的时间由/Date(1294499956278+0800)转为字符串
         ///
         private static string ConvertJsonDateToDateString(Match m)
         {
             string result = string.Empty;
             DateTime dt = new DateTime(1970, 1, 1);
             dt = dt.AddMilliseconds(long.Parse(m.Groups[1].Value));
             dt = dt.ToLocalTime();
             result = dt.ToString("yyyy-MM-dd HH:mm:ss");
             return result;
         }

         ///
         /// 将时间字符串转为Json时间
         ///
         private static string ConvertDateStringToJsonDate(Match m)
         {
             string result = string.Empty;
             DateTime dt = DateTime.Parse(m.Groups[0].Value);
             dt = dt.ToUniversalTime();
             TimeSpan ts = dt - DateTime.Parse("1970-01-01");
             result = string.Format("\\/Date({0}+0800)\\/", ts.TotalMilliseconds);
             return result;
         }

         ///
         /// List转成json
         ///
         ///
         ///
         ///
         public static string ListToJson(IList list)
         {
             object obj = list[0];
             return ListToJson(list, obj.GetType().Name);
         }

         ///
         /// 对象转换为Json字符串
         ///
         /// 对象
         /// Json字符串
         public static string ToJson(object jsonObject)
         {
             try
             {
                 StringBuilder jsonString = new StringBuilder();
                 jsonString.Append("{");
                 PropertyInfo[] propertyInfo = jsonObject.GetType().GetProperties();
                 for (int i = 0; i < propertyInfo.Length; i++)
                 {
                     object objectValue = propertyInfo[i].GetGetMethod().Invoke(jsonObject, null);
                     if (objectValue == null)
                     {
                         continue;
                     }
                     StringBuilder value = new StringBuilder();
                     if (objectValue is DateTime || objectValue is Guid || objectValue is TimeSpan)
                     {
                         value.Append("\"" + objectValue.ToString() + "\"");
                     }
                     else if (objectValue is string)
                     {
                         value.Append("\"" + objectValue.ToString() + "\"");
                     }
                     else if (objectValue is IEnumerable)
                     {
                         value.Append(ToJson((IEnumerable)objectValue));
                     }
                     else
                     {
                         value.Append("\"" + objectValue.ToString() + "\"");
                     }
                     jsonString.Append("\"" + propertyInfo[i].Name + "\":" + value + ","); ;
                 }
                 return jsonString.ToString().TrimEnd(',') + "}";
             }
             catch (Exception ex)
             {
                 throw ex;
             }
         }

         ///
         /// 对象集合转换Json
         ///
         /// 集合对象
         /// Json字符串
         public static string ToJson(IEnumerable array)
         {
             string jsonString = "[";
             foreach (object item in array)
             {
                 jsonString += ToJson(item) + ",";
             }
             if (jsonString.Length > 1)
             {
                 jsonString.Remove(jsonString.Length - 1, jsonString.Length);
             }
             else
             {
                 jsonString = "[]";
             }
             return jsonString + "]";
         }

         ///
         /// 普通集合转换Json
         ///
         /// 集合对象
         /// Json字符串
         public static string ToArrayString(IEnumerable array)
         {
             string jsonString = "[";
             foreach (object item in array)
             {
                 jsonString = ToJson(item.ToString()) + ",";
             }
             jsonString.Remove(jsonString.Length - 1, jsonString.Length);
             return jsonString + "]";
         }

         ///
         /// Datatable转换为Json
         ///
         /// Datatable对象
         /// Json字符串
         public static string ToJson(DataTable dt)
         {
             StringBuilder jsonString = new StringBuilder();
             jsonString.Append("[");
             DataRowCollection drc = dt.Rows;
             for (int i = 0; i < drc.Count; i++)
             {
                 jsonString.Append("{");
                 for (int j = 0; j < dt.Columns.Count; j++)
                 {
                     string strKey = dt.Columns[j].ColumnName;
                     string strValue = drc[i][j].ToString();
                     Type type = dt.Columns[j].DataType;
                     jsonString.Append("\"" + strKey + "\":");
                     strValue = StringFormat(strValue, type);
                     if (j < dt.Columns.Count - 1)
                     {
                         jsonString.Append(strValue + ",");
                     }
                     else
                     {
                         jsonString.Append(strValue);
                     }
                 }
                 jsonString.Append("},");
             }
             jsonString.Remove(jsonString.Length - 1, 1);
             jsonString.Append("]");
             if (jsonString.Length == 1)
             {
                 return "[]";
             }
             return jsonString.ToString();
         }

         ///
         /// DataTable转成Json
         ///
         ///
         ///
         ///
         public static string ToJson(DataTable dt, string jsonName)
         {
             StringBuilder Json = new StringBuilder();
             if (string.IsNullOrEmpty(jsonName))
                 jsonName = dt.TableName;
             Json.Append("{\"" + jsonName + "\":[");
             if (dt.Rows.Count > 0)
             {
                 for (int i = 0; i < dt.Rows.Count; i++)
                 {
                     Json.Append("{");
                     for (int j = 0; j < dt.Columns.Count; j++)
                     {
                         Type type = dt.Rows[i][j].GetType();
                         Json.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":" + StringFormat(dt.Rows[i][j] is DBNull ? string.Empty : dt.Rows[i][j].ToString(), type));
                         if (j < dt.Columns.Count - 1)
                         {
                             Json.Append(",");
                         }
                     }
                     Json.Append("}");
                     if (i < dt.Rows.Count - 1)
                     {
                         Json.Append(",");
                     }
                 }
             }
             Json.Append("]}");
             return Json.ToString();
         }

         ///
         /// DataReader转换为Json
         ///
         /// DataReader对象
         /// Json字符串
         public static string ToJson(IDataReader dataReader)
         {
             try
             {
                 StringBuilder jsonString = new StringBuilder();
                 jsonString.Append("[");

                 while (dataReader.Read())
                 {
                     jsonString.Append("{");
                     for (int i = 0; i < dataReader.FieldCount; i++)
                     {
                         Type type = dataReader.GetFieldType(i);
                         string strKey = dataReader.GetName(i);
                         string strValue = dataReader[i].ToString();
                         jsonString.Append("\"" + strKey + "\":");
                         strValue = StringFormat(strValue, type);
                         if (i < dataReader.FieldCount - 1)
                         {
                             jsonString.Append(strValue + ",");
                         }
                         else
                         {
                             jsonString.Append(strValue);
                         }
                     }
                     jsonString.Append("},");
                 }
                 if (!dataReader.IsClosed)
                 {
                     dataReader.Close();
                 }
                 jsonString.Remove(jsonString.Length - 1, 1);
                 jsonString.Append("]");
                 if (jsonString.Length == 1)
                 {
                     return "[]";
                 }
                 return jsonString.ToString();
             }
             catch (Exception ex)
             {
                 throw ex;
             }
         }

         ///
         /// DataSet转换为Json
         ///
         /// DataSet对象
         /// Json字符串
         public static string ToJson(DataSet dataSet)
         {
             string jsonString = "{";
             foreach (DataTable table in dataSet.Tables)
             {
                 jsonString += "\"" + table.TableName + "\":" + ToJson(table) + ",";
             }
             jsonString = jsonString.TrimEnd(',');
             return jsonString + "}";
         }

         ///
         /// 过滤特殊字符
         ///
         ///
         ///
         public static string String2Json(String s)
         {
             StringBuilder sb = new StringBuilder();
             for (int i = 0; i < s.Length; i++)
             {
                 char c = s.ToCharArray()[i];
                 switch (c)
                 {
                     case '\"':
                         sb.Append("\\\""); break;
                     case '\\':
                         sb.Append("\\\\"); break;
                     case '/':
                         sb.Append("\\/"); break;
                     case '\b':
                         sb.Append("\\b"); break;
                     case '\f':
                         sb.Append("\\f"); break;
                     case '\n':
                         sb.Append("\\n"); break;
                     case '\r':
                         sb.Append("\\r"); break;
                     case '\t':
                         sb.Append("\\t"); break;
                     case '\v':
                         sb.Append("\\v"); break;
                     case '\0':
                         sb.Append("\\0"); break;
                     default:
                         sb.Append(c); break;
                 }
             }
             return sb.ToString();
         }

         ///
         /// 格式化字符型、日期型、布尔型
         ///
         ///
         ///
         ///
         private static string StringFormat(string str, Type type)
         {
             if (type != typeof(string) && string.IsNullOrEmpty(str))
             {
                 str = "\"" + str + "\"";
             }
             else if (type == typeof(string))
             {
                 str = String2Json(str);
                 str = "\"" + str + "\"";
             }
             else if (type == typeof(DateTime))
             {
                 str = "\"" + str + "\"";
             }
             else if (type == typeof(bool))
             {
                 str = str.ToLower();
             }
             else if (type == typeof(byte[]))
             {
                 str = "\"" + str + "\"";
             }
             else if (type == typeof(Guid))
             {
                 str = "\"" + str + "\"";
             }
             return str;
         }
     }
 }

原作者不详，转自【http://www.open-open.com/lib/view/open1391265479317.html】