c# DataTable 导出csv文件

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 HuaTong.General.Utility

{

    public class CSVHelper

    {

        #region Fields

        string _fileName;

        DataTable _dataSource;//数据源

        string[] _titles = null;//列标题

        string[] _fields = null;//字段名

        List<string> listTitles = new List<string>();

        List<string> listFields = new List<string>();

        #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 == )

                throw new ArgumentNullException("fields");

            if (titles.Length != fields.Length)

                throw new ArgumentException("titles.Length != fields.Length", "fields");

            _fields = fields;

        }

        public CSVHelper(List<string> titles, List<string> fields, DataTable dataSource)

         : this(titles,dataSource)

        {

            if (fields == null || fields.Count == )

                throw new ArgumentNullException("fields");

            if (titles.Count != fields.Count)

                throw new ArgumentException("titles.Count != fields.Count", "fields");

            listFields = 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 == )

                throw new ArgumentNullException("titles");

            _titles = titles;

        }

        public CSVHelper(List<string> titles, DataTable dataSource)

         : this(dataSource)

        {

            if (titles == null || titles.Count == )

                throw new ArgumentNullException("titles");

            listTitles = 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 byte[] DataToCSV(string fileName)

        {

            string data = listTitles.Count >  ? ExportCSVForActiveTitle():ExportCSV();

            return System.Text.Encoding.Default.GetBytes(data);

            /*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[];

                    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 = ; 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 = ; 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 = ; i < _fields.Length; i++)

                        {

                            strbData.Append(dr[_fields[i]].ToString() + ",");

                        }

                        strbData.Append("\n");

                    }

                    return strbData.ToString();

                }

            }

        }

        private string ExportCSVForActiveTitle()

        {

            if (_dataSource == null)

                throw new ArgumentNullException("dataSource");

            StringBuilder strbData = new StringBuilder();

            if (listTitles.Count == )

            {

                //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 = ; i < _dataSource.Columns.Count; i++)

                    {

                        strbData.Append(dr[i].ToString() + ",");

                    }

                    strbData.Append("\n");

                }

                return strbData.ToString();

            }

            else

            {

                foreach (string columnName in listTitles)

                {

                    strbData.Append(columnName + ",");

                }

                strbData.Append("\n");

                if (listFields.Count == )

                {

                    foreach (DataRow dr in _dataSource.Rows)

                    {

                        for (int i = ; 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 = ; i < listFields.Count; i++)

                        {

                            strbData.Append(dr[listFields[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

    }

}

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 HuaTong.General.Utility
{
    public class CSVHelper
    {
        #region Fields
        string _fileName;
        DataTable _dataSource;//数据源
        string[] _titles = null;//列标题
        string[] _fields = null;//字段名

List<string> listTitles = new List<string>();
        List<string> listFields = new List<string>();
        #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;
        }

public CSVHelper(List<string> titles, List<string> fields, DataTable dataSource)
         : this(titles,dataSource)
        {
            if (fields == null || fields.Count == 0)
                throw new ArgumentNullException("fields");
            if (titles.Count != fields.Count)
                throw new ArgumentException("titles.Count != fields.Count", "fields");
            listFields = 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;
        }

public CSVHelper(List<string> titles, DataTable dataSource)
         : this(dataSource)
        {
            if (titles == null || titles.Count == 0)
                throw new ArgumentNullException("titles");
            listTitles = 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 byte[] DataToCSV(string fileName)
        {
            string data = listTitles.Count > 0 ? ExportCSVForActiveTitle():ExportCSV();
            return System.Text.Encoding.Default.GetBytes(data);
            /*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(dr[_fields[i]].ToString() + ",");
                        }
                        strbData.Append("\n");
                    }
                    return strbData.ToString();
                }
            }
        }

private string ExportCSVForActiveTitle()
        {
            if (_dataSource == null)
                throw new ArgumentNullException("dataSource");
            StringBuilder strbData = new StringBuilder();
            if (listTitles.Count == 0)
            {
                //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 listTitles)
                {
                    strbData.Append(columnName + ",");
                }
                strbData.Append("\n");
                if (listFields.Count == 0)
                {
                    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 < listFields.Count; i++)
                        {
                            strbData.Append(dr[listFields[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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