导入代码,从csv文件得到datatable         /// <summary>
        /// Get Data From Csv File 
        /// (Through StreamReader)
        /// </summary>
        /// <returns></returns>
        private bool GetData(Stream inputStream, out string errMessage, out DataTable dtFile)
        {
            errMessage = String.Empty;
            dtFile = new DataTable();

//this.FileUploadImport.PostedFile.InputStream.CanSeek;//StreamReader sr = new StreamReader(this.FileUploadImport.PostedFile.InputStream);//update by hwx 11/12/2010
            StreamReader sr = new StreamReader(inputStream);
            int iColumnCount = 19;//the column count in the file
            int iRow = 1;// the row number is being read
            int iColumn = 0;// the column number is being read
            string strStandardTitle = string.Empty; // the title as it is
            //read title row
            string strTitle = sr.ReadLine();
            //string[] strRowTitle = strTitle.Split(new char[] { ',' });
            string[] strRowTitle = new string[iColumnCount];
            string strCharTitle;
            int iCellNumberTitle = 0;
            bool blnQuoteTitle = false;
            for (int i = 0; i < strTitle.Length; i++)
            {
                strCharTitle = strTitle.Substring(i, 1);
                if (strCharTitle == ",")// "," is the seperation symbol of csv file,
                {
                    if (!blnQuoteTitle)
                    {
                        iCellNumberTitle++;// out of the "" range, "," is the seperation symbol
                        if (iCellNumberTitle >= iColumnCount)// too many column in this line
                        {
                            break;
                        }
                    }
                    else
                    {
                        strRowTitle[iCellNumberTitle] += strCharTitle;
                    }
                }
                else if (strCharTitle == "\"")// "\"" is the transfer symbol of csv file,
                {
                    blnQuoteTitle = !blnQuoteTitle;
                    if (blnQuoteTitle && i > 0 && strTitle.Substring(i - 1, 1) == "\"")//in the "" range and there is an transfer symbol before
                    {
                        strRowTitle[iCellNumberTitle] += strCharTitle;
                    }
                }
                else
                {
                    strRowTitle[iCellNumberTitle] += strCharTitle;
                }
            }
            //read the content
            if (strRowTitle.Length == iColumnCount)
            {
                foreach (string strCell in strRowTitle)
                {
                    iColumn++;
                    if (strCell.Trim() != string.Empty)
                    {
                        dtFile.Columns.Add(strCell);//add new column with name to the data table
                    }
                    else //file error:blank title
                    {
                        errMessage += "The cell " + iColumn.ToString() + " is blank in the header row.\r\n";
                    }
                }
                if (dtFile.Columns.Count == iColumnCount)

//make sure that no blank header or error header
                {
                    //read content row
                    string strLine;
                    while (!sr.EndOfStream)
                    {
                        iRow++;
                        iColumn = 0;
                        DataRow dr = dtFile.NewRow();
                        strLine = sr.ReadLine();

//read csv file line by line
                        string[] strRow = new string[iColumnCount];
                        string strChar;
                        int iCellNumber = 0;
                        bool blnQuote = false;//whether in the "" range
                        for (int i = 0; i < strLine.Length; i++)
                        {
                            strChar = strLine.Substring(i, 1);
                            if (strChar == ",")// "," is the seperation symbol of csv file,
                            {
                                if (!blnQuote)
                                {
                                    iCellNumber++;// out of the "" range, "," is the seperation symbol
                                    if (iCellNumber >= iColumnCount)//too many column in this line
                                    {
                                        break;
                                    }
                                }
                                else
                                {
                                    strRow[iCellNumber] += strChar;
                                }
                            }
                            else if (strChar == "\"")// "\"" is the transfer symbol of csv file,
                            {
                                blnQuote = !blnQuote;
                                if (blnQuote && i > 0 && strLine.Substring(i - 1, 1) == "\"")//in the "" range and there is an transfer symbol before
                                {
                                    strRow[iCellNumber] += strChar;
                                }
                            }
                            else
                            {
                                strRow[iCellNumber] += strChar;
                            }
                        }
                        if (iCellNumber + 1 == iColumnCount)
                        {
                            foreach (string strCell in strRow)
                            {
                                iColumn++;
                                if (strCell != null && strCell.Trim() != string.Empty)
                                {
                                    dr[strRowTitle[iColumn - 1]] = strCell.Trim();
                                }
                                else//file error:blank cell
                                {
                                    dr[strRowTitle[iColumn - 1]] = String.Empty;
                                    //errMessage += "The column \"" + strRowTitle[iColumn - 1] + "\" is blank in row " + iRow.ToString() + ".\r\n";
                                }
                            }
                        }
                        else// file error:the column count of current row do not equal to title's
                        {
                            errMessage += "There are more or less cells than title row in the row " + iRow.ToString() + ".\r\n";
                        }
                        dtFile.Rows.Add(dr);
                    }
                }
            }
            else //file error:the count of columns in the file don't equal it should be
            {
                errMessage += "There are an incorrect number of columns in the header row compared to the template file.\r\n";
            }
            sr.Close();
            sr.Dispose();

errMessage = errMessage.Replace("\r\n", "<br>");
            return errMessage == String.Empty ? true : false;
        }

/// <summary>
        /// Get dataset from csv file.
        /// </summary>
        /// <param name="filepath">http://www.nuoya118.com</param>
        /// <param name="filename"></param>
        /// <returns>Data Set</returns>
        private DataSet GetDatasetFromCsv(string filepath, string filename)
        {
            string strconn = @"driver={microsoft text driver (*.txt; *.csv)};dbq=";
            strconn += filepath;                                                        //filepath, for example: c:\
            strconn += ";extensions=asc,csv,tab,txt;";
            OdbcConnection objconn = new OdbcConnection(strconn);
            DataSet dscsv = new DataSet();
            try
            {
                string strsql = "select * from " + filename;                     //filename, for example: 1.csv
                OdbcDataAdapter odbccsvdataadapter = new OdbcDataAdapter(strsql, objconn);

odbccsvdataadapter.Fill(dscsv);
                return dscsv;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

csv导出代码

/// <summary>
        /// Export to Csv File from dataset
        /// </summary>
        /// <param name="src"></param>
        /// <param name="folderName">folderName</param>
        /// <param name="strFileName">strFileName</param>
        /// <returns></returns>
        public bool ExportToCsv(DataSet src, string folderName, string strFileName)
        {
            string csv = String.Empty;

StreamWriter writer = null;

string fileName = Server.MapPath("/") + folderName + "\\" + strFileName;

try
            {
                if (src == null || src.Tables.Count == 0) throw new Exception("dataset is null or has not table in dataset");

for (int i = 0; i < src.Tables.Count; i++)
                {

if (i > 0)

fileName = fileName.Substring(0, fileName.IndexOf('.')) + i + fileName.Substring(fileName.IndexOf("."));
                    writer = new StreamWriter(fileName);
                    DataTable dt = src.Tables[i];
                    StringBuilder sb = new StringBuilder();
                    for (int j = 0; j < dt.Columns.Count; j++)
                    {
                        string colName = dt.Columns[j].ColumnName;
                        if (colName.IndexOf(',') > -1)
                        colName = colName.Insert(0, "\"").Insert(colName.Length + 1, "\"");
                        sb.Append(colName);
                        if (!colName.Equals(""))
                            if (j != dt.Columns.Count - 1)
                                sb.Append(",");
                    }
                    writer.WriteLine(sb.ToString());
                    sb = new StringBuilder();
                    string temp = "";
                    for (int j = 0; j < dt.Rows.Count; j++)
                    {
                        DataRow dr = dt.Rows[j];
                        for (int k = 0; k < dt.Columns.Count; k++)
                        {
                            object o = dr[k];
                            if (o != null)
                                temp = o.ToString();
                            if (temp.IndexOf(',') > -1)
                                temp = temp.Insert(0, "\"").Insert(temp.Length + 1, "\"");
                            sb.Append(temp);
                            if (k != dt.Columns.Count - 1)
                                sb.Append(",");
                        }
                        writer.WriteLine(sb.ToString());
                        sb = new StringBuilder();
                        csv = sb.ToString();
                    }
                    writer.Close();
                }

string strFilePath = Server.MapPath("/") + folderName;
                if (!Directory.Exists(strFilePath))
                {
                    Directory.CreateDirectory(strFilePath);
                }

strFullFileName = Server.MapPath("/") + folderName + "\\" + fileName;
                //FullFileName = Server.MapPath(FileName);
                //FileName
                FileInfo DownloadFile = new FileInfo(strFullFileName);
                if (DownloadFile.Exists)
                {
                    Response.Clear();
                    Response.ClearHeaders();
                    Response.Buffer = false;
                    Response.ContentType = "application/octet-stream";
                    //Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(DownloadFile.FullName, System.Text.Encoding.ASCII));
                    Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.ASCII));
                    Response.AppendHeader("Content-Length", DownloadFile.Length.ToString());
                    Response.WriteFile(DownloadFile.FullName);
                    Response.Flush();
                    //Response.End();
                }
                else
                {
                    //not exist
                    throw new Exception("Export csv file does not exist!");
                }

}

catch (Exception ex)
            {
                throw new Exception("Save csv error", ex);
            }

finally
            {
                if (writer != null) writer.Close();
            }
            return true;
        }

/// <summary>
        /// List to DataTable
        /// </summary>
        /// <param name="entitys">entitys list</param>
        /// <returns></returns>
        public DataTable ListToDataTable(List<T> entitys)
        {
            if (entitys == null || entitys.Count < 1)
            {
                throw new Exception("list is null");
            }
            //get first Propertie
            Type entityType = entitys[0].GetType();
            PropertyInfo[] entityProperties = entityType.GetProperties();
            //DataTable structure
            //
            DataTable dt = new DataTable();
            for (int i = 0; i < entityProperties.Length; i++)
            {
                //dt.Columns.Add(entityProperties[i].Name, entityProperties[i].PropertyType);
                dt.Columns.Add(entityProperties[i].Name);
            }
            //add entity to DataTable
            foreach (object entity in entitys)
            {
                //check type
                if (entity.GetType() != entityType)
                {
                    throw new Exception("type not same");
                }
                object[] entityValues = new object[entityProperties.Length];
                for (int i = 0; i < entityProperties.Length; i++)
                {
                    entityValues[i] = entityProperties[i].GetValue(entity, null);
                }
                dt.Rows.Add(entityValues);
            }
            return dt;
        }

.NET中的CSV导入导出(实例)的更多相关文章

  1. AngularJS中module的导入导出

    关于AngularJS中module的导入导出,在Bob告诉我之前还没写过,谢谢Bob在这方面的指导,给到我案例代码. 在AngularJS实际项目中,我们可能需要把针对某个领域的各个方面放在不同的m ...

  2. oracle数据库的导入 导出实例

    oracle数据库的导入 导出实例 分类: DataBase2011-09-07 23:25 377人阅读 评论(0) 收藏 举报 数据库oraclefileusercmdservice 我要从另外一 ...

  3. ASP.NET 开源导入导出库Magicodes.IE 完成Csv导入导出

    Magicodes.IE Csv导入导出 说明 本章主要说明如何使用Magicodes.IE.Csv进行Csv导入导出. 主要步骤 1.安装包Magicodes.IE.Csv Install-Pack ...

  4. sqlserver中BCP命令导入导出

    个人自用导出文本文件命令: bcp [xxDB].[dbo].[xx_tb_name] out d:\temp\xxx.txt -c -t "\t" -T bcp是SQL Serv ...

  5. oracle 中数据库完全导入导出:cmd命令行模式(转载)

    http://www.3lian.com/edu/2012/12-01/47252.html Oracle数据导入导出imp/exp就相当于oracle数据还原与备份.exp命令可以把数据从远程数据库 ...

  6. NPOI 操作数据库中数据的导入导出(Excel.xls文件) 和null数据的处理。

    App.config: <?xml version="1.0" encoding="utf-8" ?> <configuration> ...

  7. jxl导入导出实例

    1 package com.tgb.test; 2 3 import java.io.File; 4 import java.io.IOException; 5 import java.util.Ar ...

  8. java实现文件批量导入导出实例(兼容xls,xlsx)

    1.介绍 java实现文件的导入导出数据库,目前在大部分系统中是比较常见的功能了,今天写个小demo来理解其原理,没接触过的同学也可以看看参考下. 目前我所接触过的导入导出技术主要有POI和iRepo ...

  9. java 中Excel的导入导出

    部分转发原作者https://www.cnblogs.com/qdhxhz/p/8137282.html雨点的名字  的内容 java代码中的导入导出 首先在d盘创建一个xlsx文件,然后再进行一系列 ...

随机推荐

  1. 多线程 AfxBeginThread 与 CreateThread 的区别

      简言之:  AfxBeginThread是MFC的全局函数,是对CreateThread的封装. CreateThread是Win32 API函数,前者最终要调到后者. 1>.具体说来,Cr ...

  2. NuGet学习笔记(2)——使用图形化界面打包自己的类库(转)

    上文NuGet学习笔记(1) 初识NuGet及快速安装使用说到NuGet相对于我们最重要的功能是能够搭建自己的NuGet服务器,实现公司内部类库的轻松共享更新.在安装好NuGet扩展后,我们已经能够通 ...

  3. sql service重置自动增长字段数字的方法

    1.--SQL表重置自增长字段(不删除表的数据) DBCC CHECKIDENT('表名', RESEED, 起始数) 2.--删除表数据的同时,重置自动增长字段 truncate table 表名

  4. 线程:Exchanger同步工具

    可以在对中对元素进行配对和交换的线程的同步点,类似于交易,A拿着钱到达指定地点,B拿着物品到达指定地点,相互交换,然后各自忙各自的事去了. package ch03; import java.util ...

  5. 前端--关于CSS

    CSS全名层叠样式表,层叠的含义有三个:1.按照特殊性的高低,特殊性高的覆盖特殊性低的样式声明:2.不同属性的样式声明要合并:3.后出现的相同的样式声明覆盖先出现的.所以要改变样式的优先级也有三种方法 ...

  6. asp.net同时调用JS和后台的无效的解决

    如果js是个定时器,那么就不走后台 <asp:Button runat="server" type="button" Text="重新发送邮件& ...

  7. PHP学习笔记三十四【记录日志】

    <?php function my_error2($errno,$errmes) { echo "错误号:".$errno; //默认时区是格林威治相差八个时区 //设置 1 ...

  8. MongoDb笔记(一)

    1.Mongodb 数据库是动态生成的可以使用use 数据库名 来指定要使用的数据库,如果数据库不存在就自动生成一个 2.插入一个文档:db.foo.insert({"name": ...

  9. CSS 设计彻底研究(一)(X)HTML与CSS核心基础

    第1章 (X)HTML与CSS核心基础 这一章重点介绍了4个方面的问题.先介绍了 HTML和XHTML的发展历程以及需要注意的问题,然后介绍了如何将CSS引入HTML,接着讲解了CSS的各种选择器,及 ...

  10. hdu1443(约瑟夫环游戏的原理 用链表过的)

    Problem Description The Joseph's problem is notoriously known. For those who are not familiar with t ...