ASP.NET中各种连接数据库的配置的方法及json数据转换_实用技巧_

 using System; using System.Collections.Generic; using System.Data; using System.Linq; using System.Reflection; using System.Text; using System.Web; using System.Web.Script.Serialization; namespace Role.DAL { public class Json { public Json() { } /// 
 ///将datatable数据转换成JSON数据, 字符串拼接写成的 /// 
 /// json名称。没发现什么作用 /// 得到的数据表 ///  public string DataTableToJson(string jsonName, DataTable dt) { StringBuilder Json = new StringBuilder(); Json.Append("["); 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(); } /// 
 /// 列表数据转换到json数据;字符串拼接写成的，太难 /// 
 ///  /// json名称。没发现什么作用 ///  ///  public string ObjectToJson(string jsonName, IList IL) { StringBuilder Json = new StringBuilder(); Json.Append("["); if (IL.Count > 0) { for (int i = 0; i < IL.Count; i++) { T obj = Activator.CreateInstance(); Type type = obj.GetType(); PropertyInfo[] pis = type.GetProperties(); Json.Append("{"); for (int j = 0; j < pis.Length; j++) { Json.Append(pis[j].Name.ToString() + ":\"" + pis[j].GetValue(IL[i], null) + "\""); if (j < pis.Length - 1) { Json.Append(","); } } Json.Append("}"); if (i < IL.Count - 1) { Json.Append(","); } } } Json.Append("]"); return Json.ToString(); } /// 
 /// 将DataTable转化为自定义JSON数据 /// 
 /// 数据表 /// JSON字符串 public static string DataTableToJson(DataTable dt) { StringBuilder JsonString = new StringBuilder(); if (dt != null && dt.Rows.Count > 0) { List> list = new List>(); for (int i = 0; i < dt.Rows.Count; i++) { Dictionary dict = new Dictionary(); for (int j = 0; j < dt.Columns.Count; j++) { dict.Add(dt.Columns[j].ColumnName, dt.Rows[i][j].ToString()); } list.Add(dict); } JavaScriptSerializer jsonSerializer = new JavaScriptSerializer(); return jsonSerializer.Serialize(list); } else { return "{}"; } } /// 
 /// 将datatable转换为json /// 
 /// Dt /// JSON字符串 public static string Dtb2Json(DataTable dtb) { JavaScriptSerializer jss = new JavaScriptSerializer(); System.Collections.ArrayList dic = new System.Collections.ArrayList(); if (dtb != null && dtb.Rows.Count > 0) { foreach (DataRow dr in dtb.Rows) { System.Collections.Generic.Dictionary drow = new System.Collections.Generic.Dictionary(); foreach (DataColumn dc in dtb.Columns) { drow.Add(dc.ColumnName, dr[dc.ColumnName]); } dic.Add(drow); } //序列化 return jss.Serialize(dic); } else { return "{}"; } } } }