列車時刻查詢系統(北大青鳥大二寒假作業) 源代碼(六)

導出數據類,主要包括導出XML文件和文本文件

using System;
using System.IO;
using System.Windows.Forms;
using System.Data;
using System.Text;
namespace train
...{
    /**//// <summary>
    /// ExportData:導出數據
    /// </summary>
    public class ExportData
    ...{
        private DataTable table;
        private DataSet ds;
        public ExportData()
        ...{
            table=new DataTable();
            ds=new DataSet();
        }

  /**//// <summary>

        /// 導出文本文件
        /// </summary>
        /// <param name="printtable">包含要導出數據的DataTable</param>
        /// <returns>返回一個bool值指示導出是否成功</returns>
        public bool Export(DataTable printtable)
        ...{
            table=printtable;
            SaveFileDialog dialog=new SaveFileDialog();
            dialog.Filter="文本文件|*.txt";
            dialog.ShowDialog();
            string path=dialog.FileName;
            if(path.Length==0)
            ...{
                return false;
            }
            StreamWriter writer=new StreamWriter(@path,false,Encoding.UTF8,128);
            try
 ...{
                for(int i=0;i<table.Columns.Count;i++)
                ...{
                    writer.Write(table.Columns[i].ColumnName+" ");
                }
                writer.WriteLine("");
                for(int i=0;i<table.Rows.Count;i++)
                ...{
                    for(int j=0;j<table.Columns.Count;j++)
                    ...{
                        writer.Write(table.Rows[i][j].ToString()+" ");
                    }
                    writer.WriteLine("");
                }
                return true;
            }

catch(Exception e)
            ...{
                Console.WriteLine(e);
                return false;
            }
            finally
            ...{
                writer.Flush();
                writer.Close();
            }
        }
        /**//// <summary>
        /// 導出XML文件
        /// </summary>
        /// <param name="printtable">包含要到處數據的DataTable</param>
        /// <returns>返回一個bool值指示導出是否成功</returns>
        public bool exportXML(DataTable printtable)
...{
            ds.Tables.Add(printtable);
            SaveFileDialog dialog=new SaveFileDialog();
            dialog.Filter="XML文件|*.XML";
            dialog.ShowDialog();
            string path=dialog.FileName;
            if(path.Length==0)
            ...{
                return false;
            }
            try
            ...{
                ds.WriteXml(@path,XMLWriteMode.WriteSchema);
                return true;
            }
            catch(Exception e)
            ...{
                Console.WriteLine(e.Message);
                return 

false;
            }
            
        }

        
    }
}