C#自定义将各种对象转换成JSON格式的类

这个C#封装类可以用于将各种格式的数据转换成JSON格式，包括List转换成Json，普通集合转换Json ，DataSet转换为Json ，Datatable转换为Json ，DataReader转换为Json等，如果你需要将对象转换成JSON，可以使用这个类。

using System; using System.Collections.Generic; using System.Text; using System.Data; using System.Reflection; using System.Collections; using System.Data.Common;   namespace DotNet.Utilities {     //JSON转换类     public class ConvertJson     {         #region 私有方法         /// <summary>         /// 过滤特殊字符         /// </summary>         private 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;                     default:                         sb.Append(c); break;                 }             }             return sb.ToString();         }           /// <summary>         /// 格式化字符型、日期型、布尔型         /// </summary>         private static string StringFormat(string str, Type type)         {             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(string) && string.IsNullOrEmpty(str))             {                 str = "\"" + str + "\"";             }             return str;         }         #endregion           #region List转换成Json         /// <summary>         /// List转换成Json         /// </summary>         public static string ListToJson<T>(IList<T> list)         {             object obj = list[0];             return ListToJson<T>(list, obj.GetType().Name);         }           /// <summary>         /// List转换成Json         /// </summary>         public static string ListToJson<T>(IList<T> 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<T>();                     PropertyInfo[] pi = obj.GetType().GetProperties();                     Json.Append("{");                     for (int j = 0; j < pi.Length; j++)                     {                         Type type = pi[j].GetValue(list[i], null).GetType();                         Json.Append("\"" + pi[j].Name.ToString() + "\":" + StringFormat(pi[j].GetValue(list[i], null).ToString(), type));                           if (j < pi.Length - 1)                         {                             Json.Append(",");                         }                     }                     Json.Append("}");                     if (i < list.Count - 1)                     {                         Json.Append(",");                     }                 }             }             Json.Append("]}");             return Json.ToString();         }         #endregion           #region 对象转换为Json         /// <summary>         /// 对象转换为Json         /// </summary>         /// <param name="jsonObject">对象</param>         /// <returns>Json字符串</returns>         public static string ToJson(object jsonObject)         {             string jsonString = "{";             PropertyInfo[] propertyInfo = jsonObject.GetType().GetProperties();             for (int i = 0; i < propertyInfo.Length; i++)             {                 object objectValue = propertyInfo[i].GetGetMethod().Invoke(jsonObject, null);                 string value = string.Empty;                 if (objectValue is DateTime || objectValue is Guid || objectValue is TimeSpan)                 {                     value = "'" + objectValue.ToString() + "'";                 }                 else if (objectValue is string)                 {                     value = "'" + ToJson(objectValue.ToString()) + "'";                 }                 else if (objectValue is IEnumerable)                 {                     value = ToJson((IEnumerable)objectValue);                 }                 else                 {                     value = ToJson(objectValue.ToString());                 }                 jsonString += "\"" + ToJson(propertyInfo[i].Name) + "\":" + value + ",";             }             jsonString.Remove(jsonString.Length - 1, jsonString.Length);             return jsonString + "}";         }         #endregion           #region 对象集合转换Json         /// <summary>         /// 对象集合转换Json         /// </summary>         /// <param name="array">集合对象</param>         /// <returns>Json字符串</returns>         public static string ToJson(IEnumerable array)         {             string jsonString = "[";             foreach (object item in array)             {                 jsonString += ToJson(item) + ",";             }             jsonString.Remove(jsonString.Length - 1, jsonString.Length);             return jsonString + "]";         }         #endregion           #region 普通集合转换Json         /// <summary>         /// 普通集合转换Json         /// </summary>         /// <param name="array">集合对象</param>         /// <returns>Json字符串</returns>         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 + "]";         }         #endregion           #region  DataSet转换为Json         /// <summary>         /// DataSet转换为Json         /// </summary>         /// <param name="dataSet">DataSet对象</param>         /// <returns>Json字符串</returns>         public static string ToJson(DataSet dataSet)         {             string jsonString = "{";             foreach (DataTable table in dataSet.Tables)             {                 jsonString += "\"" + table.TableName + "\":" + ToJson(table) + ",";             }             jsonString = jsonString.TrimEnd(',');             return jsonString + "}";         }         #endregion           #region Datatable转换为Json         /// <summary>         /// Datatable转换为Json         /// </summary>         /// <param name="table">Datatable对象</param>         /// <returns>Json字符串</returns>         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("]");             return jsonString.ToString();         }           /// <summary>         /// DataTable转换为Json         /// </summary>         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].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();         }         #endregion           #region DataReader转换为Json         /// <summary>         /// DataReader转换为Json         /// </summary>         /// <param name="dataReader">DataReader对象</param>         /// <returns>Json字符串</returns>         public static string ToJson(DbDataReader dataReader)         {             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("},");             }             dataReader.Close();             jsonString.Remove(jsonString.Length - 1, 1);             jsonString.Append("]");             return jsonString.ToString();         }         #endregion     } }