.net 操作 json

#region 将datatable转换为ajson字符串
/// <summary>
/// 将datatable转换为ajson字符串
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
private string DatatableToJson(DataTable dt)
{
string jsonStr = string.Empty;
if (dt.Rows.Count > 0)
{
JavaScriptSerializer jss = new JavaScriptSerializer();
System.Collections.ArrayList dic = new System.Collections.ArrayList();
foreach (DataRow dr in dt.Rows)
{
System.Collections.Generic.Dictionary<string, object> drow = new System.Collections.Generic.Dictionary<string, object>();
foreach (DataColumn dc in dt.Columns)
{
drow.Add(dc.ColumnName, dr[dc.ColumnName]);
}
dic.Add(drow);

}
// 序列化
jsonStr = jss.Serialize(dic);
}
return jsonStr;
}
#endregion

#region Json 字符串转换为ArrayList数据集合
/// <summary>
/// Json 字符串转换为ArrayList数据集合
/// </summary>
/// <param name="json"></param>
/// <returns></returns>
public ArrayList JsonToArrayList(string json)
{
JavaScriptSerializer javaScriptSerializer = new JavaScriptSerializer();
javaScriptSerializer.MaxJsonLength = Int32.MaxValue; //取得最大数值
ArrayList arrayList = javaScriptSerializer.Deserialize<ArrayList>(json);
return arrayList;
}
#endregion