C#读取Excel的方法总结_c#读写excel文件内容

C#如何读取EXCEL文件，这是很多小伙伴都想知道的，本文就为大家带来三种比较经典的C#读取Excel的方法，一起来看看吧。

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：

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

在项目中添加Excel.dll文件.的引用

//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();
}
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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;
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();
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另外也可以将数据库数据导入到一个txt文件，实例如下：

//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();
}
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以上就是C#读取Excel文件的三种方法，希望对大家有所帮助。