任意类型转换成json

项目中经常要用到json格式的数据,把收集和整理的转换json数据的方法发布如下:

在.net framework2.0中,没有JavaScriptSerializer(3.0) 和DataContractJsonSerializer (3.5),所以经常要用手写的转换类,这样调试也方便些,何况JavaScriptSerializer 和DataContractJsonSerializer 还有一些对特殊字符解析的bug

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    /// <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)

    {

        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;

        }

    }

 

    /// <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(IDataReader 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("]");

        if (jsonString.Length == 1)

        {

            return "[]";

        }

        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) && string.IsNullOrEmpty(str))

        {

            str = "\"" + str + "\"";

        }

        else if (type == typeof(string))

        {

            str = String2Json(str);

            str = "\"" + str + "\"";

        }

        else if (type == typeof(DateTime))

        {

            str = "\"" + str.Split(' ')[0] + "\"";

        }

        else if (type == typeof(bool))

        {

            str = str.ToLower();

        }

 

        return str;

    }

 

posted @ 2009-12-14 21:31 亦心 阅读(...) 评论(...) 编辑 收藏