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
    }
}

c# DataTable 导出csv文件的更多相关文章

每日学习心得：Linq解决DataTable按照某一列的值排序问题/DataTable 导出CSV文件/巧用text-overflow解决数据绑定列数据展示过长问题
2013-8-5 1 Linq解决DataTable按照某一列的值排序在之前的总结中提到过对拼接而成的复合的DataTable按照某一列值的大小排序,那个主要的思想是在新建表结构时将要排序的那一列的 ...
C#将DataTable数据导出CSV文件
C#将DataTable数据导出CSV文件通用方法! //导出按钮调用导出方法 protected void btnCSV_Click(object sender, EventArgs e) ...
导出csv文件示例
导出csv文件示例 csv文件默认以英文逗号,做为列分隔符换行符\n作为行分隔符,写入到一个.csv文件即可.含有英文逗号,和换行符会发生数据输出会出现混乱,下面列出一些处理方法.特殊字符处理1.含有 ...
mysql SQLyog导入导出csv文件
1.选择数据库表 --> 右击属性 --> 备份/导出 --> 导出表数据作为 --> 选择cvs --> 选择下面的“更改” --> 字段 --> 变量长度 ...
PHP 读取/导出 CSV文件
工作中经常会有遇到导入/导出的需求,下面是常用的方法.读取CSV文件,可以分页读取,设置读取行数,起始行数即可.导出CSV文件,用两种方法进行实现. /** * 读取CSV文件 * @param st ...
Web 端 js 导出csv文件(使用a标签)
前言导出文件,使用最多的方式还是服务器端来处理.比如jsp 中使用response 的方式. 但是,有时候可能就想使用web 前端是否也可以把页面上的内容导出来呢? 比如说,导出页面的一个表格. 这 ...
PHP导出CSV文件出现乱码的解决方法
在做项目时碰到使用外语的情况下,我们就会使用UTF-8编码.但是,在用PHP导出CSV文件时,如果写入的数据是使用UTF-8编码的日语.韩语之类的外文,就会出现乱码. 要解决PHP生成CSV文件的乱码 ...
[转]PL/SQL Developer 导入导出csv文件
PL/SQL Developer 可以导入或者导出CSV文件. 导入CSV文件步骤: 1.选择tools->text importer.... 2.选择第二个Data to oracle选项卡, ...
导出csv文件数字会自动变科学计数法的解决方法
其实这个问题跟用什么语言导出csv文件没有关系.Excel显示数字时,如果数字大于12位,它会自动转化为科学计数法:如果数字大于15位,它不仅用于科学技术费表示,还会只保留高15位,其他位都变0.解决 ...

随机推荐

HCNP学习笔记之HCNP学习的几种境界
前言: 做任何事情都应该遵循一个循序渐进的过程,而这个过程可能是较为枯乏无味的,在我接触的人中主要分为踏实肯学满腹才华和半途而废不思进取两类.故而希望大家成为前者,勿做后者. 第一境界:散漫无序简单 ...
linux及安全第三周总结——20135227黄晓妍
总结部分: Linux内核源代码: Arch 支持不同cpu的源代码:主要关注x86 Init 内核启动的相关代码:主要关注main.c,整个Linux内核启动代码start_kernel函数 K ...
关于js中对事件绑定与普通事件的理解
普通事件指的是可以用来注册的事件: 事件绑定是指把事件注册到具体的元素之上. 通俗点说: 普通事件:给html元素添加一个特定的属性(如:onclick): 事件绑定:js代码中通过标记(id ta ...
Linux下的Nginx安装
1 nginx安装环境 nginx是C语言开发,建议在linux上运行,本教程使用Centos6.5作为安装环境. gcc 安装nginx需要先将官网下载的源码进行编译,编译依赖gcc环境,如果没有g ...
[Deep Learning] 神经网络基础【转】
本文转载自:http://www.cnblogs.com/maybe2030/p/5597716.html 阅读目录 1. 神经元模型 2. 感知机和神经网络 3. 误差逆传播算法 4. 常见的神经网 ...
MySQL—记录的增删改查操作
1.插入记录: 方法一:INSERT [INTO] tbl_name [(col_name,···)] {VALUES|VALUE} ({expr |DEFAULT},···),(···),··· 例 ...
Keepalived安装配置入门
准备两台虚拟机,IP如下: A:192.168.1.11 B:192.168.1.12 A为Master,B为BackUp 1.安装 yum install keepalived -y 2.配置 A服 ...
整数分解为若干项之和 - PAT
深度搜索,一开始没有想到,说明基本功还是不够啊,加油 //======================================================================= ...
数据结构实习 problem O Huffman Tree
Huffman Tree 题目描述对输入的英文大写字母进行统计概率然后构建哈夫曼树,输出是按照概率降序排序输出Huffman编码. 输入大写字母个数 n 第一个字母第二个字母第三个字母 .. ...
解题报告：hdu2191汶川地震 - 多重背包模板
2017-09-03 17:01:36 writer:pprp 这是一道多重背包裸题 - 记得是从右向左进行,还有几点需要注意啊,都在代码中表示出来了代码如下: /* @theme:hdu2191 ...

c# DataTable 导出csv文件

c# DataTable 导出csv文件的更多相关文章

随机推荐

热门专题