列车时刻查询系统(北大青鸟大二寒假作业) 源代码(七)

导入数据类,主要包括导入XML数据

 

 

using  System;
using  System.Data;
using  System.Windows.Forms;
namespace  train
... {
    /**//// 

    /// ImportData :导入数据
    /// 

    public class ImportData
    ...{
        private DataSet ds;
        private DataTable table;
        public ImportData()
        ...{
            ds=new DataSet();
            table=new DataTable();
        }
        /**//// 

        /// 从XML文件导入数据
        /// 

        /// 返回包含数据的DataTable
        public DataTable ImportDataFromXml()
        ...{
            OpenFileDialog dialog=new OpenFileDialog();
            dialog.Filter="XML文件|*.xml";
            dialog.ShowDialog();
            string path=dialog.FileName;
            if(path.Length==0)
            ...{
                return null;
            }
            try
            ...{
                ds.ReadXml(@path,XmlReadMode.Auto);
                return ds.Tables[0];
            }
            catch(Exception e)
            ...{
                Console.WriteLine(e.Message);
                return null;
            }
        }

    }
}