ASP.NET之JSONHelper操作

之前说到了Ext.Net中GridPanel行取值的问题（Ext.Net开发_GridPanel行选中取值），涉及到checkBox操作时，要留个心眼注意下取值的区别！返回值是Json格式。 现在用到了Json，就想自己也整一个Josn帮助类。在线帮助的资料很多，在巨人的身上东凑西凑也凑一个用用。 　　

 

一、介绍

　　JSON(JavaScript Object Notation) 是一种轻量级的数据交换格式，基于JavaScript（Standard ECMA-262 3rd Edition - December 1999）的一个子集

 

　　方法有多种，我这边用到是DataContractJsonSerializer类，官方解释：“NET Framework 4 .NET Framework 3.5 Silverlight 将对象序列化为 JavaScript 对象表示法 (JSON)，并将 JSON 数据反序列化为对象”。

 

　　其命名空间如下：

 

 

　 注意：如果是.NET Framework 3.5  光引用了“System.Runtime.Serialization”了这个还不行。运行时会发现：

 

 

 

所以还要引用下“System.ServiceModel.Web”即可。   .NET Framework 4则在System.Runtime.Serialization下。

 

二、对JSON数据操作

 源码：

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;
using System.Web.Script.Serialization;
using System.Collections.Generic;
using System.Runtime.Serialization.Json;
namespace WebUI.CommonClass
{
    public class JSONHelper
    { 

          /// <summary>
          /// JSON序列化
        /// </summary>
        public static string JsonSerializer<T>(T t)
        {
            DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));
            MemoryStream ms = new MemoryStream();
            ser.WriteObject(ms, t);
            string jsonString = Encoding.UTF8.GetString(ms.ToArray());
            ms.Close();
            //替换Json的Date字符串
            string p = @"\\/Date\((\d+)\+\d+\)\\/";
            MatchEvaluator matchEvaluator = new MatchEvaluator(ConvertJsonDateToDateString);
            Regex reg = new Regex(p);
            jsonString = reg.Replace(jsonString, matchEvaluator);
            return jsonString;
        }

        /// <summary>
        /// JSON反序列化
      /// </summary>
        public static T JsonDeserialize<T>(string jsonString)
        {
            //将"yyyy-MM-dd HH:mm:ss"格式的字符串转为"\/Date(1294499956278+0800)\/"格式
            string p = @"\d{4}-\d{2}-\d{2}\s\d{2}:\d{2}:\d{2}";
            MatchEvaluator matchEvaluator = new MatchEvaluator(ConvertDateStringToJsonDate);
            Regex reg = new Regex(p);
            jsonString = reg.Replace(jsonString, matchEvaluator);
            DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));
            MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonString));
            T obj = (T)ser.ReadObject(ms);
            return obj;
        } 

        /// <summary>
        /// 将Json序列化的时间由/Date(1294499956278+0800)转为字符串
      /// </summary>
        private static string ConvertJsonDateToDateString(Match m)
        {
            string result = string.Empty;
            DateTime dt = new DateTime(1970, 1, 1);
            dt = dt.AddMilliseconds(long.Parse(m.Groups[1].Value));
            dt = dt.ToLocalTime();
            result = dt.ToString("yyyy-MM-dd HH:mm:ss");
            return result;
        }

        /// <summary>
        /// 将时间字符串转为Json时间
      /// </summary>
        private static string ConvertDateStringToJsonDate(Match m)
        {
            string result = string.Empty;
            DateTime dt = DateTime.Parse(m.Groups[0].Value);
            dt = dt.ToUniversalTime();
            TimeSpan ts = dt - DateTime.Parse("1970-01-01");
            result = string.Format("\\/Date({0}+0800)\\/", ts.TotalMilliseconds);
            return result;
        }
    }
}

实验下：

Product

    public class Product
    {
        public string proName { get ;set ; }
        public decimal  proPrice { get; set; }
        public string proAttr { get; set; }
        public string proAddres { get; set; } 
    }

操作

1：序列化

Product pro = new Product();
pro.proAddres = "上海";
pro.proAttr = "cpu";
pro.proName = "电脑";
pro.proPrice = 3680;
string josn = JSONHelper.JsonSerializer<Product>(pro);   //序列化
Message.ShowAlert("提示", josn);

效果：

2，反序列化

string json = "{\"proAddres\":\"上海\",\"proAttr\":\"cpu\",\"proName\":\"电脑\",\"proPrice\":3680}";
Product pro = JSONHelper.JsonDeserialize<Product>(json);

 

 

 

 

 

  JSONHELP

　　

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Script.Serialization;
using System.Collections;
using System.Data;
using System.Text;
using System.Reflection;
using System.Globalization;
using System.Text.RegularExpressions;namespace FumaCRM_BS.NewWeb.Common.Class
{public class JsonHelper{/// <summary>/// DataTable转Json/// </summary>/// <param name="dtb"></param>/// <returns></returns>public static string Dtb2Json(DataTable dtb){JavaScriptSerializer jss = new JavaScriptSerializer();ArrayList dic = new ArrayList();foreach (DataRow row in dtb.Rows){Dictionary<string, object> drow = new Dictionary<string, object>();foreach (DataColumn col in dtb.Columns){drow.Add(col.ColumnName, row[col.ColumnName]);}dic.Add(drow);}return jss.Serialize(dic);}/// <summary>/// Json转DataTable/// </summary>/// <param name="json"></param>/// <returns></returns>public static DataTable Json2Dtb(string json){JavaScriptSerializer jss = new JavaScriptSerializer();ArrayList dic = jss.Deserialize<ArrayList>(json);DataTable dtb = new DataTable();if (dic.Count > 0){foreach (Dictionary<string, object> drow in dic){if (dtb.Columns.Count == 0){foreach (string key in drow.Keys){//if (drow[key].GetType() != null)//    dtb.Columns.Add(key, drow[key].GetType());//else
                                dtb.Columns.Add(key);}}DataRow row = dtb.NewRow();foreach (string key in drow.Keys){row[key] = drow[key];}dtb.Rows.Add(row);}}return dtb;}public static string DataTable2Json(DataTable dt){if (dt == null || dt.Rows.Count == 0)return "[]";StringBuilder jsonBuilder = new StringBuilder();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("\":\"");string value = dt.Rows[i][j].ToString().Replace("\r", "").Replace("\n", "").Replace("\t", "").Trim();if (dt.Columns[j].DataType.FullName == "System.DateTime")jsonBuilder.Append(value.Length == 0 ? value : Convert.ToDateTime(value).ToString("yyyy-MM-dd"));elsejsonBuilder.Append(value);jsonBuilder.Append("\",");}jsonBuilder.Remove(jsonBuilder.Length - 1, 1);jsonBuilder.Append("},");}jsonBuilder.Remove(jsonBuilder.Length - 1, 1);jsonBuilder.Append("]");return jsonBuilder.ToString();}#region JqueryEasyUI JSON  Method/// <summary>/// 生成表单编辑赋值 JSON格式/// </summary>/// <param name="dt"></param>/// <param name="displayCount"></param>/// <returns></returns>public static string CreateJsonOne(DataTable dt, bool displayCount){StringBuilder JsonString = new StringBuilder();//Exception Handling        if (dt != null && dt.Rows.Count > 0){for (int i = 0; i < dt.Rows.Count; i++){JsonString.Append("{ ");for (int j = 0; j < dt.Columns.Count; j++){if (j < dt.Columns.Count - 1){JsonString.Append("ipt_" + dt.Columns[j].ColumnName.ToString().ToLower() + ":" + "\"" + dt.Rows[i][j].ToString() + "\",");}else if (j == dt.Columns.Count - 1){JsonString.Append("ipt_" + dt.Columns[j].ColumnName.ToString().ToLower() + ":" + "\"" + dt.Rows[i][j].ToString() + "\"");}}if (i == dt.Rows.Count - 1){JsonString.Append("} ");}else{JsonString.Append("}, ");}}return JsonString.ToString();}else{return null;}}/// <summary>/// 将DataTable中的数据转换成JSON格式/// </summary>/// <param name="dt">数据源DataTable</param>/// <param name="displayCount">是否输出数据总条数</param>/// <returns></returns>public static string CreateJsonParameters(DataTable dt, bool displayCount){return CreateJsonParameters(dt, displayCount, dt.Rows.Count);}/// <summary>/// 将DataTable中的数据转换成JSON格式/// </summary>/// <param name="dt">数据源DataTable</param>/// <returns></returns>public static string CreateJsonParameters(DataTable dt){return CreateJsonParameters(dt, true);}/// <summary>/// 将DataTable中的数据转换成JSON格式/// </summary>/// <param name="dt">数据源DataTable</param>/// <param name="displayCount">是否输出数据总条数</param>/// <param name="totalcount">JSON中显示的数据总条数</param>/// <returns></returns>public static string CreateJsonParameters(DataTable dt, bool displayCount, int totalcount){StringBuilder JsonString = new StringBuilder();//Exception Handling        if (dt != null){JsonString.Append("{ ");JsonString.Append("\"rows\":[ ");for (int i = 0; i < dt.Rows.Count; i++){JsonString.Append("{ ");for (int j = 0; j < dt.Columns.Count; j++){if (j < dt.Columns.Count - 1){//if (dt.Rows[i][j] == DBNull.Value) continue;if (dt.Columns[j].DataType == typeof(bool)){JsonString.Append("\"JSON_" + dt.Columns[j].ColumnName.ToLower() + "\":" +dt.Rows[i][j].ToString().ToLower() + ",");}else if (dt.Columns[j].DataType == typeof(string)){JsonString.Append("\"JSON_" + dt.Columns[j].ColumnName.ToLower() + "\":" + "\"" +dt.Rows[i][j].ToString().Replace("\"", "\\\"") + "\",");}else{JsonString.Append("\"JSON_" + dt.Columns[j].ColumnName.ToLower() + "\":" + "\"" + dt.Rows[i][j] + "\",");}}else if (j == dt.Columns.Count - 1){//if (dt.Rows[i][j] == DBNull.Value) continue;if (dt.Columns[j].DataType == typeof(bool)){JsonString.Append("\"JSON_" + dt.Columns[j].ColumnName.ToLower() + "\":" +dt.Rows[i][j].ToString().ToLower());}else if (dt.Columns[j].DataType == typeof(string)){JsonString.Append("\"JSON_" + dt.Columns[j].ColumnName.ToLower() + "\":" + "\"" +dt.Rows[i][j].ToString().Replace("\"", "\\\"") + "\"");}else{JsonString.Append("\"JSON_" + dt.Columns[j].ColumnName.ToLower() + "\":" + "\"" + dt.Rows[i][j] + "\"");}}}/*end Of String*/if (i == dt.Rows.Count - 1){JsonString.Append("} ");}else{JsonString.Append("}, ");}}JsonString.Append("]");if (displayCount){JsonString.Append(",");JsonString.Append("\"total\":");JsonString.Append(totalcount);}JsonString.Append("}");return JsonString.ToString().Replace("\n", "");}else{return null;}}#region object 2 jsonprivate static void WriteDataRow(StringBuilder sb, DataRow row){sb.Append("{");foreach (DataColumn column in row.Table.Columns){sb.AppendFormat("\"{0}\":", column.ColumnName);WriteValue(sb, row[column]);sb.Append(",");}// Remove the trailing comma.if (row.Table.Columns.Count > 0){--sb.Length;}sb.Append("}");}private static void WriteDataSet(StringBuilder sb, DataSet ds){sb.Append("{\"Tables\":{");foreach (DataTable table in ds.Tables){sb.AppendFormat("\"{0}\":", table.TableName);WriteDataTable(sb, table);sb.Append(",");}// Remove the trailing comma.if (ds.Tables.Count > 0){--sb.Length;}sb.Append("}}");}private static void WriteDataTable(StringBuilder sb, DataTable table){sb.Append("{\"Rows\":[");foreach (DataRow row in table.Rows){WriteDataRow(sb, row);sb.Append(",");}// Remove the trailing comma.if (table.Rows.Count > 0){--sb.Length;}sb.Append("]}");}private static void WriteEnumerable(StringBuilder sb, IEnumerable e){bool hasItems = false;sb.Append("[");foreach (object val in e){WriteValue(sb, val);sb.Append(",");hasItems = true;}// Remove the trailing comma.if (hasItems){--sb.Length;}sb.Append("]");}private static void WriteHashtable(StringBuilder sb, IDictionary e){bool hasItems = false;sb.Append("{");foreach (string key in e.Keys){sb.AppendFormat("\"{0}\":", key.ToLower());WriteValue(sb, e[key]);sb.Append(",");hasItems = true;}// Remove the trailing comma.if (hasItems){--sb.Length;}sb.Append("}");}private static void WriteObject(StringBuilder sb, object o){MemberInfo[] members = o.GetType().GetMembers(BindingFlags.Instance | BindingFlags.Public);sb.Append("{");bool hasMembers = false;foreach (MemberInfo member in members){bool hasValue = false;object val = null;if ((member.MemberType & MemberTypes.Field) == MemberTypes.Field){FieldInfo field = (FieldInfo)member;val = field.GetValue(o);hasValue = true;}else if ((member.MemberType & MemberTypes.Property) == MemberTypes.Property){PropertyInfo property = (PropertyInfo)member;if (property.CanRead && property.GetIndexParameters().Length == 0){val = property.GetValue(o, null);hasValue = true;}}if (hasValue){sb.Append("\"");sb.Append(member.Name);sb.Append("\":");WriteValue(sb, val);sb.Append(",");hasMembers = true;}}if (hasMembers){--sb.Length;}sb.Append("}");}private static void WriteString(StringBuilder sb, IEnumerable s){sb.Append("\"");foreach (char c in s){switch (c){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:int i = c;if (i < 32 || i > 127){sb.AppendFormat("\\u{0:X04}", i);}else{sb.Append(c);}break;}}sb.Append("\"");}public static void WriteValue(StringBuilder sb, object val){if (val == null || val == DBNull.Value){sb.Append("null");}else if (val is string || val is Guid){WriteString(sb, val.ToString());}else if (val is bool){sb.Append(val.ToString().ToLower());}else if (val is double ||val is float ||val is long ||val is int ||val is short ||val is byte ||val is decimal){sb.AppendFormat(CultureInfo.InvariantCulture.NumberFormat, "{0}", val);}else if (val.GetType().IsEnum){sb.Append((int)val);}else if (val is DateTime){sb.Append("new Date(\"");sb.Append(((DateTime)val).ToString("MMMM, d yyyy HH:mm:ss",new CultureInfo("en-US", false).DateTimeFormat));sb.Append("\")");}else if (val is DataSet){WriteDataSet(sb, val as DataSet);}else if (val is DataTable){WriteDataTable(sb, val as DataTable);}else if (val is DataRow){WriteDataRow(sb, val as DataRow);}else if (val is Hashtable){WriteHashtable(sb, val as Hashtable);}else if (val is IEnumerable){WriteEnumerable(sb, val as IEnumerable);}else{WriteObject(sb, val);}}/// <summary>/// /// </summary>/// <param name="o"></param>/// <returns></returns>public static string Convert2Json(object o){StringBuilder sb = new StringBuilder();WriteValue(sb, o);return sb.ToString();}#endregion#endregion/// <summary>/// 转换对象为JSON格式数据/// </summary>/// <typeparam name="T">类</typeparam>/// <param name="obj">对象</param>/// <returns>字符格式的JSON数据</returns>public static string GetJSON<T>(object obj){string result = String.Empty;try{System.Runtime.Serialization.Json.DataContractJsonSerializer serializer =new System.Runtime.Serialization.Json.DataContractJsonSerializer(typeof(T));using (System.IO.MemoryStream ms = new System.IO.MemoryStream()){serializer.WriteObject(ms, obj);result = System.Text.Encoding.UTF8.GetString(ms.ToArray());}}catch (Exception ex){throw ex;}return result;}/// <summary>/// 转换List<T>的数据为JSON格式/// </summary>/// <typeparam name="T">类</typeparam>/// <param name="vals">列表值</param>/// <returns>JSON格式数据</returns>public static string JSON<T>(List<T> vals){System.Text.StringBuilder st = new System.Text.StringBuilder();try{System.Runtime.Serialization.Json.DataContractJsonSerializer s = new System.Runtime.Serialization.Json.DataContractJsonSerializer(typeof(T));foreach (T city in vals){using (System.IO.MemoryStream ms = new System.IO.MemoryStream()){s.WriteObject(ms, city);st.Append(System.Text.Encoding.UTF8.GetString(ms.ToArray()));}}}catch (Exception ex){throw ex;}return st.ToString();}/// <summary>/// JSON格式字符转换为T类型的对象/// </summary>/// <typeparam name="T"></typeparam>/// <param name="jsonStr"></param>/// <returns></returns>public static T ParseFormByJson<T>(string jsonStr){T obj = Activator.CreateInstance<T>();using (System.IO.MemoryStream ms =new System.IO.MemoryStream(System.Text.Encoding.UTF8.GetBytes(jsonStr))){System.Runtime.Serialization.Json.DataContractJsonSerializer serializer =new System.Runtime.Serialization.Json.DataContractJsonSerializer(typeof(T));return (T)serializer.ReadObject(ms);}}/// <summary>/// 将获取的Json数据转换为DataTable/// </summary>/// <param name="strJson">Json字符串</param>/// <returns></returns>public static DataTable JsonToDataTable(string strJson){//取出表名   var rg = new Regex(@"(?<={)[^:]+(?=:\[)", RegexOptions.IgnoreCase);string strName = rg.Match(strJson).Value;DataTable tb = null;//去除表名   strJson = strJson.Substring(strJson.IndexOf("[") + 1);strJson = strJson.Substring(0, strJson.IndexOf("]"));//获取数据   rg = new Regex(@"(?<={)[^}]+(?=})");MatchCollection mc = rg.Matches(strJson);for (int i = 0; i < mc.Count; i++){string strRow = mc[i].Value;string[] strRows = strRow.Split(',');//创建表   if (tb == null){tb = new DataTable();tb.TableName = strName;foreach (string str in strRows){var dc = new DataColumn();string[] strCell = str.Split(':');dc.ColumnName = strCell[0].Replace("\"", "");// strCell[0];
                        tb.Columns.Add(dc);}tb.AcceptChanges();}//增加内容   DataRow dr = tb.NewRow();for (int r = 0; r < strRows.Length; r++){dr[r] = strRows[r].Split(':')[1].Trim().Replace("，", ",").Replace("：", ":").Replace("\"", "");}tb.Rows.Add(dr);tb.AcceptChanges();}return tb;}/// <summary>/// /// </summary>/// <param name="strJson"></param>/// <param name="symbol"></param>/// <returns></returns>public static DataTable JsonToDataTable(string strJson, string symbol){//取出表名   var rg = new Regex(@"(?<={)[^:]+(?=:\[)", RegexOptions.IgnoreCase);string strName = rg.Match(strJson).Value;DataTable tb = null;//去除表名   strJson = strJson.Substring(strJson.IndexOf("[") + 1);strJson = strJson.Substring(0, strJson.IndexOf("]"));//获取数据   rg = new Regex(@"(?<={)[^}]+(?=})");MatchCollection mc = rg.Matches(strJson);for (int i = 0; i < mc.Count; i++){string strRow = mc[i].Value;string[] strRows = strRow.Replace(symbol, "|").Split('|');// (symbol);//创建表   if (tb == null){tb = new DataTable();tb.TableName = strName;foreach (string str in strRows){var dc = new DataColumn();string[] strCell = str.Split(':');dc.ColumnName = strCell[0].Replace("\"", "");// strCell[0];
                        tb.Columns.Add(dc);}tb.AcceptChanges();}//增加内容   DataRow dr = tb.NewRow();for (int r = 0; r < strRows.Length; r++){dr[r] = strRows[r].Split(':')[1].Trim().Replace("，", ",").Replace("：", ":").Replace("\"", "");}tb.Rows.Add(dr);tb.AcceptChanges();}return tb;}/// <summary>     /// dataTable转换成Json格式     /// </summary>     /// <param name="dt"></param>     /// <returns></returns>     public static string ToJson(DataTable dt){StringBuilder jsonBuilder = new StringBuilder();jsonBuilder.Append("{\"");jsonBuilder.Append(dt.TableName);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();}}
}

 https://www.cnblogs.com/PEPE/archive/2012/02/13/Pepe_Yu.html