C# 读取EXCEL文件的三种方法

itlao6 .NET 开发&源码评论1,078字数 5145阅读17分9秒阅读模式

本文将介绍excel文件读取方式,分别通过OleDB,office excel,csv文件流三种方式读取:

1.方法一:采用OleDB读取EXCEL文件:

把EXCEL文件当做一个数据源来进行数据的读取操作,实例如下:文章源自IT老刘-https://itlao6.com/1660.html

public DataSet ExcelToDS(string Path) 
{ 
    string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" +"Data Source="+ Path +";"+"Extended Properties=Excel 8.0;"; 
    OleDbConnection conn = new OleDbConnection(strConn); 
    conn.Open();   
    string strExcel = "";    
    OleDbDataAdapter myCommand = null; 
    DataSet ds = null; 
    strExcel="select * from [sheet1$]"; 
    myCommand = new OleDbDataAdapter(strExcel, strConn); 
    ds = new DataSet(); 
    myCommand.Fill(ds,"table1");    
    return ds; 
}

 文章源自IT老刘-https://itlao6.com/1660.html

对于EXCEL中的表即sheet([sheet1$])如果不是固定的可以使用下面的方法得到文章源自IT老刘-https://itlao6.com/1660.html

string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" +"Data Source="+ Path +";"+"Extended Properties=Excel 8.0;"; 
OleDbConnection conn = new OleDbConnection(strConn); 
DataTable schemaTable = objConn.GetOleDbSchemaTable(System.Data.OleDb.OleDbSchemaGuid.Tables,null); 
string tableName=schemaTable.Rows[0][2].ToString().Trim();

另外:也可进行写入EXCEL文件,实例如下:文章源自IT老刘-https://itlao6.com/1660.html

public void DSToExcel(string Path,DataSet oldds) 
{ 
    //先得到汇总EXCEL的DataSet 主要目的是获得EXCEL在DataSet中的结构 
    string strCon = " Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source ="+path1+";Extended Properties=Excel 8.0" ; 
    OleDbConnection myConn = new OleDbConnection(strCon) ; 
    string strCom="select * from [Sheet1$]"; 
    myConn.Open() ; 
    OleDbDataAdapter myCommand = new OleDbDataAdapter ( strCom, myConn ) ; 
    ystem.Data.OleDb.OleDbCommandBuilder builder=new OleDbCommandBuilder(myCommand); 
    //QuotePrefix和QuoteSuffix主要是对builder生成InsertComment命令时使用。 
    builder.QuotePrefix="[";     //获取insert语句中保留字符(起始位置) 
    builder.QuoteSuffix="]"; //获取insert语句中保留字符(结束位置) 
    DataSet newds=new DataSet(); 
    myCommand.Fill(newds ,"Table1") ; 
    for(int i=0;i<oldds.Tables[0].Rows.Count;i++) 
    { 
        //在这里不能使用ImportRow方法将一行导入到news中,因为ImportRow将保留原来DataRow的所有设置(DataRowState状态不变)。
       在使用ImportRow后newds内有值,但不能更新到Excel中因为所有导入行的DataRowState!=Added 
        DataRow nrow=aDataSet.Tables["Table1"].NewRow(); 
        for(int j=0;j<newds.Tables[0].Columns.Count;j++) 
        { 
           nrow[j]=oldds.Tables[0].Rows[i][j]; 
        } 
        newds.Tables["Table1"].Rows.Add(nrow); 
    } 
    myCommand.Update(newds,"Table1"); 
    myConn.Close(); 
}

2.方法二:引用的com组件:Microsoft.Office.Interop.Excel.dll   读取EXCEL文件

首先是Excel.dll的获取,将Office安装目录下的Excel.exe文件Copy到DotNet的bin目录下,cmd到该目录下,运行 TlbImp EXCEL.EXE Excel.dll 得到Dll文件。 再在项目中添加引用该dll文件.文章源自IT老刘-https://itlao6.com/1660.html

    //读取EXCEL的方法   (用范围区域读取数据)
    private void OpenExcel(string strFileName)
    {
        object missing = System.Reflection.Missing.Value;
        Application excel = new Application();//lauch excel application
        if (excel == null)
        {
            Response.Write("<script>alert('Can't access excel')</script>");
        }
        else
        {
            excel.Visible = false; excel.UserControl = true;
            // 以只读的形式打开EXCEL文件
            Workbook wb = excel.Application.Workbooks.Open(strFileName, missing, true, missing, missing, missing,
             missing, missing, missing, true, missing, missing, missing, missing, missing);
            //取得第一个工作薄
            Worksheet ws = (Worksheet)wb.Worksheets.get_Item(1);
        //取得总记录行数   (包括标题列)
        int rowsint = ws.UsedRange.Cells.Rows.Count; //得到行数
        //int columnsint = mySheet.UsedRange.Cells.Columns.Count;//得到列数


        //取得数据范围区域 (不包括标题列) 
        Range rng1 = ws.Cells.get_Range("B2", "B" + rowsint);   //item


        Range rng2 = ws.Cells.get_Range("K2", "K" + rowsint); //Customer
        object[,] arryItem= (object[,])rng1.Value2;   //get range's value
        object[,] arryCus = (object[,])rng2.Value2;   
        //将新值赋给一个数组
        string[,] arry = new string[rowsint-1, 2];
        for (int i = 1; i <= rowsint-1; i++)
        {
            //Item_Code列
            arry[i - 1, 0] =arryItem[i, 1].ToString();
            //Customer_Name列
            arry[i - 1, 1] = arryCus[i, 1].ToString();
        }
        Response.Write(arry[0, 0] + " / " + arry[0, 1] + "#" + arry[rowsint - 2, 0] + " / " + arry[rowsint - 2, 1]);
    }
     excel.Quit(); excel = null;
    Process[] procs = Process.GetProcessesByName("excel");


    foreach (Process pro in procs)
    {
        pro.Kill();//没有更好的方法,只有杀掉进程
    }
    GC.Collect();
}

3.方法三:将EXCEL文件转化成CSV(逗号分隔)的文件,用文件流读取(等价就是读取一个txt文本文件)。

先引用命名空间:using System.Text;和using System.IO;文章源自IT老刘-https://itlao6.com/1660.html

FileStream fs = new FileStream("d:\Customer.csv", FileMode.Open, FileAccess.Read, FileShare.None);
StreamReader sr = new StreamReader(fs, System.Text.Encoding.GetEncoding(936));
string str = "";
string s = Console.ReadLine();
while (str != null)
{
    str = sr.ReadLine();
    string[] xu = new String[2];
    xu = str.Split(',');
    string ser = xu[0]; 
    string dse = xu[1];                
    if (ser == s)
    { 
        Console.WriteLine(dse);break;
    }
}   
sr.Close();

另外也可以将数据库数据导入到一个txt文件,实例如下:文章源自IT老刘-https://itlao6.com/1660.html

//txt文件名
string fn = DateTime.Now.ToString("yyyyMMddHHmmss") + "-" + "PO014" + ".txt";
OleDbConnection con = new OleDbConnection(conStr);
con.Open();
string sql = "select ITEM,REQD_DATE,QTY,PUR_FLG,PO_NUM from TSD_PO014";
//OleDbCommand mycom = new OleDbCommand("select * from TSD_PO014", mycon);
//OleDbDataReader myreader = mycom.ExecuteReader(); //也可以用Reader读取数据
DataSet ds = new DataSet();
OleDbDataAdapter oda = new OleDbDataAdapter(sql, con);
oda.Fill(ds, "PO014");
DataTable dt = ds.Tables[0];

FileStream fs = new FileStream(Server.MapPath("download/" + fn), FileMode.Create, FileAccess.ReadWrite);
StreamWriter strmWriter = new StreamWriter(fs); //存入到文本文件中

//把标题写入.txt文件中 
//for (int i = 0; i <dt.Columns.Count;i++)
//{
//  strmWriter.Write(dt.Columns[i].ColumnName + " ");
//}

foreach (DataRow dr in dt.Rows)
{
    string str0, str1, str2, str3;
    string str = "|"; //数据用"|"分隔开
    str0 = dr[0].ToString();
    str1 = dr[1].ToString();
    str2 = dr[2].ToString();
    str3 = dr[3].ToString();
    str4 = dr[4].ToString().Trim();
    strmWriter.Write(str0);
    strmWriter.Write(str);
    strmWriter.Write(str1);
    strmWriter.Write(str);
    strmWriter.Write(str2);
    strmWriter.Write(str);
    strmWriter.Write(str3);
    strmWriter.WriteLine(); //换行
}
strmWriter.Flush();
strmWriter.Close();
if (con.State == ConnectionState.Open)
{
    con.Close();
}

ps: 因为最近需要用到,所以百度了一下,找到这篇,刚好可用,于是转载了过来,方便更多人看到,也方便自己以后查看。文章源自IT老刘-https://itlao6.com/1660.html

本文代码来自:https://www.open-open.com/code/view/1420029490093
文章源自IT老刘-https://itlao6.com/1660.html文章源自IT老刘-https://itlao6.com/1660.html
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  • 本文由 发表于 2019年 10月 26日 23:20:52
  • 转载请务必保留本文链接:https://itlao6.com/1660.html
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