using Newtonsoft.Json; using System; using System.Collections.Generic; using System.Data; using System.Text; namespace NC.Common { /// <summary>
/// JSON帮助类 /// </summary>
public class JsonHelper { /// <summary>
/// 对象转JSON /// </summary>
/// <param name="obj">对象</param>
/// <returns>JSON格式的字符串</returns>
public static string ObjectToJSON(object obj) { try { byte[] b = Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(obj)); return Encoding.UTF8.GetString(b); } catch (Exception ex) { throw new Exception("JSONHelper.ObjectToJSON(): " + ex.Message); } } /// <summary>
/// 数据表转键值对集合 /// 把DataTable转成 List集合, 存每一行 /// 集合中放的是键值对字典,存每一列 /// </summary>
/// <param name="dt">数据表</param>
/// <returns>哈希表数组</returns>
public static List<Dictionary<string, object>> DataTableToList(DataTable dt) { List<Dictionary<string, object>> list = new List<Dictionary<string, object>>(); foreach (DataRow dr in dt.Rows) { Dictionary<string, object> dic = new Dictionary<string, object>(); foreach (DataColumn dc in dt.Columns) { dic.Add(dc.ColumnName, dr[dc.ColumnName]); } list.Add(dic); } return list; } /// <summary>
/// 数据集转键值对数组字典 /// </summary>
/// <param name="dataSet">数据集</param>
/// <returns>键值对数组字典</returns>
public static Dictionary<string, List<Dictionary<string, object>>> DataSetToDic(DataSet ds) { Dictionary<string, List<Dictionary<string, object>>> result = new Dictionary<string, List<Dictionary<string, object>>>(); foreach (DataTable dt in ds.Tables) result.Add(dt.TableName, DataTableToList(dt)); return result; } /// <summary>
/// 数据表转JSON /// </summary>
/// <param name="dataTable">数据表</param>
/// <returns>JSON字符串</returns>
public static string DataTableToJSON(DataTable dt) { return ObjectToJSON(DataTableToList(dt)); } /// <summary>
/// JSON文本转对象,泛型方法 /// </summary>
/// <typeparam name="T">类型</typeparam>
/// <param name="jsonText">JSON文本</param>
/// <returns>指定类型的对象</returns>
public static T JSONToObject<T>(string jsonText) { //JavaScriptSerializer jss = new JavaScriptSerializer();
try { return JsonConvert.DeserializeObject<T>(jsonText); //return jss.Deserialize<T>(jsonText);
} catch (Exception ex) { throw new Exception("JSONHelper.JSONToObject(): " + ex.Message); } } /// <summary>
/// 将JSON文本转换为数据表数据 /// </summary>
/// <param name="jsonText">JSON文本</param>
/// <returns>数据表字典</returns>
public static Dictionary<string, List<Dictionary<string, object>>> TablesDataFromJSON(string jsonText) { return JSONToObject<Dictionary<string, List<Dictionary<string, object>>>>(jsonText); } /// <summary>
/// 将JSON文本转换成数据行 /// </summary>
/// <param name="jsonText">JSON文本</param>
/// <returns>数据行的字典</returns>
public static Dictionary<string, object> DataRowFromJSON(string jsonText) { return JSONToObject<Dictionary<string, object>>(jsonText); } } }
