XML和JSON 序列化以及DataTable转JSON

using System.IO;
using System.Text;
using System.Xml.Serialization;
using System.Xml;
using System.Runtime.Serialization.Json;

namespace Common.Core
{
    public class SerializationHelper
    {
        private static string XmlSerialize(object o)
        {
            XmlSerializer ser = new XmlSerializer(o.GetType());
            System.IO.MemoryStream mem = new MemoryStream();
            XmlTextWriter writer = new XmlTextWriter(mem, Encoding.UTF8);
            XmlSerializerNamespaces ns = new XmlSerializerNamespaces();
            ns.Add("", "");
            ser.Serialize(writer, o, ns);
            writer.Close();
            return Encoding.UTF8.GetString(mem.ToArray());
        }

        private static T XmlDeserialize<T>(string s)
        {
            XmlDocument xdoc = new XmlDocument();
            try
            {
                xdoc.LoadXml(s);
                XmlNodeReader reader = new XmlNodeReader(xdoc.DocumentElement);
                XmlSerializer ser = new XmlSerializer(typeof(T));
                object obj = ser.Deserialize(reader);
                return (T)obj;
            }
            catch
            {
                return default(T);
            }
        }

        private static string JsonSerialize(object o)
        {
            using (var ms = new MemoryStream())
            {
                new DataContractJsonSerializer(o.GetType()).WriteObject(ms, o);
                return Encoding.UTF8.GetString(ms.ToArray());
            }
        }

        private static T JsonDeserialize<T>(string s)
        {
            using (var ms = new MemoryStream(Encoding.UTF8.GetBytes(s)))
            {
                return (T)new DataContractJsonSerializer(typeof(T)).ReadObject(ms);
            }
        }

        /// <summary>
        /// 将对象根据格式（XML/JSON）序列化成字符串结果
        /// </summary>
        /// <param name="o">目标对象</param>
        /// <param name="format">输出格式</param>
        /// <returns></returns>
        public static string Serialize(object o, Format format)
        {
            if (format == Format.Xml)
            {
                return SerializationHelper.XmlSerialize(o);
            }
            else
            {
                return SerializationHelper.JsonSerialize(o);
            }
        }

        /// <summary>
        /// 将字符串根据格式（XML/JSON）反序列化成指定类型的对象
        /// </summary>
        /// <typeparam name="T">指定类型</typeparam>
        /// <param name="s">目标字符串</param>
        /// <param name="format">输入格式</param>
        /// <returns></returns>
        public static T Deserialize<T>(string s, Format format)
        {
            if (format == Format.Xml)
            {
                return SerializationHelper.XmlDeserialize<T>(s);
            }
            else
            {
                return SerializationHelper.JsonDeserialize<T>(s);
            }
        }
    }
}

public class DataTableConvertJson
    {

        #region dataTable转换成Json格式
        /// <summary>  
        /// dataTable转换成Json格式  
        /// </summary>  
        /// <param name="dt"></param>  
        /// <returns></returns>  
        public static string DataTable2Json(DataTable dt)
        {
            StringBuilder jsonBuilder = new StringBuilder();
            jsonBuilder.Append("{"");
            jsonBuilder.Append(dt.TableName);
            jsonBuilder.Append("":[");
            jsonBuilder.Append("[");
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                jsonBuilder.Append("{");
                for (int j = 0; j < dt.Columns.Count; j++)
                {
                    jsonBuilder.Append(""");
                    jsonBuilder.Append(dt.Columns[j].ColumnName);
                    jsonBuilder.Append("":"");
                    jsonBuilder.Append(dt.Rows[i][j].ToString());
                    jsonBuilder.Append("",");
                }
                jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
                jsonBuilder.Append("},");
            }
            jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
            jsonBuilder.Append("]");
            jsonBuilder.Append("}");
            return jsonBuilder.ToString();
        }

        #endregion dataTable转换成Json格式
        #region DataSet转换成Json格式
        /// <summary>  
        /// DataSet转换成Json格式  
        /// </summary>  
        /// <param name="ds">DataSet</param> 
        /// <returns></returns>  
        public static string Dataset2Json(DataSet ds)
        {
            StringBuilder json = new StringBuilder();

            foreach (DataTable dt in ds.Tables)
            {
                json.Append("{"");
                json.Append(dt.TableName);
                json.Append("":");
                json.Append(DataTable2Json(dt));
                json.Append("}");
            } return json.ToString();
        }
        #endregion

        /// <summary>
        /// Msdn
        /// </summary>
        /// <param name="jsonName"></param>
        /// <param name="dt"></param>
        /// <returns></returns>
        public static string DataTableToJson(string jsonName, DataTable dt)
        {
            StringBuilder Json = new StringBuilder();
            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++)
                    {
                        Json.Append(""" + dt.Columns[j].ColumnName.ToString() + "":"" + dt.Rows[i][j].ToString() + """);
                        if (j < dt.Columns.Count - 1)
                        {
                            Json.Append(",");
                        }
                    }
                    Json.Append("}");
                    if (i < dt.Rows.Count - 1)
                    {
                        Json.Append(",");
                    }
                }
            }
            Json.Append("]}");
            return Json.ToString();
        }
    }

参考：http://www.cnblogs.com/ynbt/archive/2012/12/11/2813911.html