C# IDataReader转换为Json

  1         /// <summary>
  2         /// IDataReader转换为Json
  3         /// </summary>
  4         /// <param name="dataReader">DataReader对象</param>
  5         /// <returns>Json字符串</returns>
  6         public static string ToJson(IDataReader dataReader)
  7         {
  8             try
  9             {
 10                 StringBuilder jsonString = new StringBuilder();
 11                 jsonString.Append("[");
 12
 13                 while (dataReader.Read())
 14                 {
 15                     jsonString.Append("{");
 16                     for (int i = 0; i < dataReader.FieldCount; i++)
 17                     {
 18                         Type type = dataReader.GetFieldType(i);
 19                         string strKey = dataReader.GetName(i);
 20                         string strValue = dataReader[i].ToString();
 21                         jsonString.Append("\"" + strKey + "\":");
 22                         strValue = StringFormat(strValue, type);
 23                         if (i < dataReader.FieldCount - 1)
 24                         {
 25                             jsonString.Append(strValue + ",");
 26                         }
 27                         else
 28                         {
 29                             jsonString.Append(strValue);
 30                         }
 31                     }
 32                     jsonString.Append("},");
 33                 }
 34                 if (!dataReader.IsClosed)
 35                 {
 36                     dataReader.Close();
 37                 }
 38                 jsonString.Remove(jsonString.Length - 1, 1);
 39                 jsonString.Append("]");
 40                 if (jsonString.Length == 1)
 41                 {
 42                     return "[]";
 43                 }
 44                 return jsonString.ToString();
 45             }
 46             catch (Exception ex)
 47             {
 48                 throw ex;
 49             }
 50         }
 51         /// <summary>
 52         /// 格式化字符型、日期型、布尔型
 53         /// </summary>
 54         /// <param name="str"></param>
 55         /// <param name="type"></param>
 56         /// <returns></returns>
 57         private static string StringFormat(string str, Type type)
 58         {
 59             if (type != typeof(string) && string.IsNullOrEmpty(str))
 60             {
 61                 str = "\"" + str + "\"";
 62             }
 63             else if (type == typeof(string))
 64             {
 65                 str = String2Json(str);
 66                 str = "\"" + str + "\"";
 67             }
 68             else if (type == typeof(DateTime))
 69             {
 70                 str = "\"" + str + "\"";
 71             }
 72             else if (type == typeof(bool))
 73             {
 74                 str = str.ToLower();
 75             }
 76             else if (type == typeof(byte[]))
 77             {
 78                 str = "\"" + str + "\"";
 79             }
 80             else if (type == typeof(Guid))
 81             {
 82                 str = "\"" + str + "\"";
 83             }
 84             return str;
 85         }
 86         /// <summary>
 87         /// 过滤特殊字符
 88         /// </summary>
 89         /// <param name="s"></param>
 90         /// <returns></returns>
 91         public static string String2Json(String s)
 92         {
 93             StringBuilder sb = new StringBuilder();
 94             for (int i = 0; i < s.Length; i++)
 95             {
 96                 char c = s.ToCharArray()[i];
 97                 switch (c)
 98                 {
 99                     case '\"':
100                         sb.Append("\\\""); break;
101                     case '\\':
102                         sb.Append("\\\\"); break;
103                     case '/':
104                         sb.Append("\\/"); break;
105                     case '\b':
106                         sb.Append("\\b"); break;
107                     case '\f':
108                         sb.Append("\\f"); break;
109                     case '\n':
110                         sb.Append("\\n"); break;
111                     case '\r':
112                         sb.Append("\\r"); break;
113                     case '\t':
114                         sb.Append("\\t"); break;
115                     case '\v':
116                         sb.Append("\\v"); break;
117                     case '\0':
118                         sb.Append("\\0"); break;
119                     default:
120                         sb.Append(c); break;
121                 }
122             }
123             return sb.ToString();
124         }