将不同数据类型转为json格式

/// <summary>   /// List转成json    /// </summary>   /// <typeparam name="T"></typeparam>   /// <param name="jsonName"></param>   /// <param name="list"></param>   /// <returns></returns>   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();   }   /// <summary>   /// List转成json    /// </summary>   /// <typeparam name="T"></typeparam>   /// <param name="list"></param>   /// <returns></returns>   public static string ListToJson<T>(IList<T> list)   {    object obj = list[0];    return ListToJson<T>(list, obj.GetType().Name);   }   /// <summary>    /// 对象转换为Json字符串    /// </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 + "}";   }   /// <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 + "]";   }   /// <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 + "]";   }   /// <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转成Json    /// </summary>   /// <param name="jsonName"></param>   /// <param name="dt"></param>   /// <returns></returns>   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();   }   /// <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();   }   /// <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 + "}";   }   /// <summary>   /// 过滤特殊字符   /// </summary>   /// <param name="s"></param>   /// <returns></returns>   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>   /// <param name="str"></param>   /// <param name="type"></param>   /// <returns></returns>   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();    }    return str;   }