cyf
110 lines
4.0 KiB
C#
110 lines
4.0 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Data;
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using System.Web.Script.Serialization;
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using System.Collections;
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namespace CommonLib {
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/// <summary>
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/// JSON转换帮助类
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/// </summary>
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public static class JsonUtil {
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#region Json字符串转换为DataTable 实例方法
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public static DataTable JsonToDataTable(String json) {
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DataTable dt = ToDataTable(json);
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return dt;
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}
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#endregion
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#region DataTable 转换为Json 字符串
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/// <summary>
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/// DataTable 对象 转换为Json 字符串
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/// </summary>
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/// <param name="dt"></param>
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/// <returns></returns>
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public static string ToJson(this DataTable dt) {
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JavaScriptSerializer javaScriptSerializer = new JavaScriptSerializer();
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javaScriptSerializer.MaxJsonLength = Int32.MaxValue; //取得最大数值
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ArrayList arrayList = new ArrayList();
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foreach (DataRow dataRow in dt.Rows) {
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Dictionary<string, object> dictionary = new Dictionary<string, object>(); //实例化一个参数集合
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foreach (DataColumn dataColumn in dt.Columns) {
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dictionary.Add(dataColumn.ColumnName, dataRow[dataColumn.ColumnName].ToStr());
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}
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arrayList.Add(dictionary); //ArrayList集合中添加键值
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}
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return javaScriptSerializer.Serialize(arrayList); //返回一个json字符串
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}
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#endregion
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#region Json 字符串 转换为 DataTable数据集合
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/// <summary>
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/// Json 字符串 转换为 DataTable数据集合
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/// </summary>
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/// <param name="json"></param>
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/// <returns></returns>
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public static DataTable ToDataTable(this string json) {
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DataTable dataTable = new DataTable(); //实例化
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DataTable result;
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try {
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JavaScriptSerializer javaScriptSerializer = new JavaScriptSerializer();
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javaScriptSerializer.MaxJsonLength = Int32.MaxValue; //取得最大数值
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ArrayList arrayList = javaScriptSerializer.Deserialize<ArrayList>(json);
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if (arrayList.Count > 0) {
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foreach (Dictionary<string, object> dictionary in arrayList) {
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if (dictionary.Keys.Count<string>() == 0) {
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result = dataTable;
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return result;
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}
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if (dataTable.Columns.Count == 0) {
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foreach (string current in dictionary.Keys) {
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dataTable.Columns.Add(current, dictionary[current].GetType());
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}
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}
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DataRow dataRow = dataTable.NewRow();
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foreach (string current in dictionary.Keys) {
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dataRow[current] = dictionary[current];
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}
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dataTable.Rows.Add(dataRow); //循环添加行到DataTable中
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}
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}
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}
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catch {
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}
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result = dataTable;
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return result;
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}
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#endregion
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#region 转换为string字符串类型
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/// <summary>
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/// 转换为string字符串类型
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/// </summary>
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/// <param name="s">获取需要转换的值</param>
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/// <param name="format">需要格式化的位数</param>
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/// <returns>返回一个新的字符串</returns>
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public static string ToStr(this object s, string format = "") {
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string result = "";
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try {
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if (format == "") {
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result = s.ToString();
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}
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else {
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result = string.Format("{0:" + format + "}", s);
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}
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}
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catch {
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}
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return result;
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}
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#endregion
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}
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}
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