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[ASP.net教程]各种类型的JSON格式化


using System;using System.Collections.Generic;using System.Text;using System.Data;using System.Reflection;using System.Collections;using System.Data.Common;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}