导出数据到CVS文件代码,CSharp代码库,德仔网

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【CSharp】导出数据到CVS文件
作者:Hugh / 发布于2014/1/28/ 462
//这里写了一个通用的类

using System;
using System.Data;
using System.Configuration;
using System.Collections.Generic;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Text;
using System.Reflection;
using System.IO;
using System.Data.Odbc;

namespace Com.DRPENG.SDXY.UI.Common
{
  public class CSVHelper
  {
    #region Fields
    string _fileName;
    DataTable _dataSource;//数据源
    string[] _titles = null;//列标题
    string[] _fields = null;//字段名

    #endregion

    #region .ctor
    /// <summary>
    /// 构造函数
    /// </summary>
    /// <param name="dataSource">数据源</param>
    public CSVHelper()
    {

    }

    /// <summary>
    /// 构造函数
    /// </summary>
    /// <param name="titles">要输出到 Excel 的列标题的数组</param>
    /// <param name="fields">要输出到 Excel 的字段名称数组</param>
    /// <param name="dataSource">数据源</param>
    public CSVHelper(string[] titles, string[] fields, DataTable dataSource)
      : this(titles, dataSource)
    {
      if (fields == null || fields.Length == 0)
        throw new ArgumentNullException("fields");
      if (titles.Length != fields.Length)
        throw new ArgumentException("titles.Length != fields.Length", "fields");

      _fields = fields;
    }

    /// <summary>
    /// 构造函数
    /// </summary>
    /// <param name="titles">要输出到 Excel 的列标题的数组</param>
    /// <param name="dataSource">数据源</param>
    public CSVHelper(string[] titles, DataTable dataSource)
      : this(dataSource)
    {
      if (titles == null || titles.Length == 0)
        throw new ArgumentNullException("titles");

      _titles = titles;
    }

    /// <summary>
    /// 构造函数
    /// </summary>
    /// <param name="dataSource">数据源</param>
    public CSVHelper(DataTable dataSource)
    {
      if (dataSource == null)
        throw new ArgumentNullException("dataSource");
      // maybe more checks needed here (IEnumerable, IList, IListSource, ) ???
      // 很难判断，先简单的使用 DataTable

      _dataSource = dataSource;
    }

    #endregion

    #region public Methods

    #region 导出到CSV文件并且提示下载
    /// <summary>
    /// 导出到CSV文件并且提示下载
    /// </summary>
    /// <param name="fileName"></param>
    public void DataToCSV(string fileName)
    {
      // 确保有一个合法的输出文件名
      //if (fileName == null || fileName == string.Empty || !(fileName.ToLower().EndsWith(".csv")))
      //  fileName = GetRandomFileName();
      string data = ExportCSV();
      HttpContext.Current.Response.ClearHeaders();
      HttpContext.Current.Response.Clear();
      HttpContext.Current.Response.Expires = 0;
      HttpContext.Current.Response.BufferOutput = true;
      HttpContext.Current.Response.Charset = "GB2312";
      HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
      HttpContext.Current.Response.AppendHeader("Content-Disposition", string.Format("attachment;filename={0}.csv", System.Web.HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8)));
      HttpContext.Current.Response.ContentType = "text/h323;charset=gbk";
      HttpContext.Current.Response.Write(data);
      HttpContext.Current.Response.End();
    }

    #endregion

    /// <summary>
    /// 获取CSV导入的数据
    /// </summary>
    /// <param name="filePath">文件路径</param>
    /// <param name="fileName">文件名称(.csv不用加)</param>
    /// <returns></returns>
    public DataTable GetCsvData(string filePath,string fileName)
    {
      string path = Path.Combine(filePath, fileName + ".csv");
      string connString = @"Driver={Microsoft Text Driver (*.txt; *.csv)};Dbq=" + filePath + ";Extensions=asc,csv,tab,txt;";
      try
      {
        using (OdbcConnection odbcConn = new OdbcConnection(connString))
        {
          odbcConn.Open();
          OdbcCommand oleComm = new OdbcCommand();
          oleComm.Connection = odbcConn;
          oleComm.CommandText = "select * from [" + fileName + "#csv]";
          OdbcDataAdapter adapter = new OdbcDataAdapter(oleComm);
          DataSet ds = new DataSet();
          adapter.Fill(ds, fileName);
          return ds.Tables[0];
          odbcConn.Close();
        }
        if (File.Exists(path))
        {
          File.Delete(path);
        }
      }
      catch (Exception ex)
      {
        if (File.Exists(path))
        {
          File.Delete(path);
        }
        throw ex;
      }
    }
    #endregion

    #region 返回写入CSV的字符串
    /// <summary>
    /// 返回写入CSV的字符串
    /// </summary>
    /// <returns></returns>
    private string ExportCSV()
    {  
      if(_dataSource==null)
        throw new ArgumentNullException("dataSource");

      StringBuilder strbData = new StringBuilder();
      if (_titles == null)
      {
        //添加列名
        foreach (DataColumn column in _dataSource.Columns)
        {
          strbData.Append(column.ColumnName + ",");
        }
        strbData.Append("\n");
        foreach (DataRow dr in _dataSource.Rows)
        {
          for (int i = 0; i < _dataSource.Columns.Count; i++)
          {
            strbData.Append(dr[i].ToString() + ",");
          }
          strbData.Append("\n");
        }
        return strbData.ToString();
      }
      else
      {
        foreach (string columnName in _titles)
        {
          strbData.Append(columnName + ",");
        }
        strbData.Append("\n");
        if (_fields == null)
        {
          foreach (DataRow dr in _dataSource.Rows)
          {
            for (int i = 0; i < _dataSource.Columns.Count; i++)
            {
              strbData.Append(dr[i].ToString() + ",");
            }
            strbData.Append("\n");
          }
          return strbData.ToString();
        }
        else
        {
          foreach (DataRow dr in _dataSource.Rows)
          {
            for (int i = 0; i < _fields.Length; i++)
            {
              strbData.Append(_fields[i].ToString() + ",");
            }
            strbData.Append("\n");
          }
          return strbData.ToString();
        }
      }
    }
    #endregion

    #region 得到一个随意的文件名
    /// <summary>
    /// 得到一个随意的文件名
    /// </summary>
    /// <returns></returns>
    private string GetRandomFileName()
    {
      Random rnd = new Random((int)(DateTime.Now.Ticks));
      string s = rnd.Next(Int32.MaxValue).ToString();
      return DateTime.Now.ToShortDateString() + "_" + s + ".csv";
    }
    #endregion
  }

}
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