列車時刻查詢系統(北大青鳥大二寒假作業) 源代碼(七)

導入數據類,主要包括導入XML數據

using System;
using System.Data;
using System.Windows.Forms;
namespace train
...{
    /**//// <summary>
    /// ImportData :導入數據
    /// </summary>
    public class ImportData
    ...{
        private DataSet ds;
        private DataTable table;
        public ImportData()
        ...{
            ds=new DataSet();
            table=new DataTable();
        }

/**//// <summary>

        /// 從XML文件導入數據
        /// </summary>
        /// <returns>返回包含數據的DataTable</returns>
        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;
            }
        }

    }
}