asp.net讀取excel文件的三種方法示例

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    這篇文章主要介紹了asp.net讀取excel文件的三種方法示例,包括采用OleDB讀取Excel文件、引用的com組件讀取Excel文件、用文件流讀取,需要的朋友可以參考下
    方法一:采用OleDB讀取Excel文件
    把Excel文件當(dāng)做一個(gè)數(shù)據(jù)源來(lái)進(jìn)行數(shù)據(jù)的讀取操作,實(shí)例如下:
    代碼如下:
    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$]";
    myCommand = new OleDbDataAdapter(strExcel, strConn);
    ds = new DataSet();
    myCommand.Fill(ds,"table1");
    return ds;
    }
    對(duì)于Excel中的表即sheet([sheet1$])如果不是固定的可以使用下面的方法得到
    代碼如下:
    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:也可進(jìn)行寫(xiě)入Excel文件,實(shí)例如下:
    代碼如下:
    public void DSToExcel(string Path,DataSet oldds)
    {
    //先得到匯總Excel的DataSet 主要目的是獲得Excel在DataSet中的結(jié)構(gòu)
    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 ) ;
    system.Data.OleDb.OleDbCommandBuilder builder=new OleDbCommandBuilder(myCommand);
    //QuotePrefix和QuoteSuffix主要是對(duì)builder生成InsertComment命令時(shí)使用。
    builder.QuotePrefix="["; //獲取insert語(yǔ)句中保留字符(起始位置)
    builder.QuoteSuffix="]"; //獲取insert語(yǔ)句中保留字符(結(jié)束位置)
    DataSet newds=new DataSet();
    myCommand.Fill(newds ,"Table1") ;
    for(int i=0;i<oldds.Tables[0].Rows.Count;i++)
    {
    //在這里不能使用ImportRow方法將一行導(dǎo)入到news中,
    //因?yàn)镮mportRow將保留原來(lái)DataRow的所有設(shè)置(DataRowState狀態(tài)不變)。
    //在使用ImportRow后newds內(nèi)有值,但不能更新到Excel中因?yàn)樗袑?dǎo)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();
    }
    方法二:引用的com組件:Microsoft.Office.Interop.Excel.dll讀取Excel文件
    首先是Excel.dll的獲取,將Office安裝目錄下的Excel.exe文件Copy到DotNet的bin目錄下,cmd到該目錄下,運(yùn)行 TlbImp EXCEL.EXE Excel.dll 得到Dll文件。
    在項(xiàng)目中添加引用該dll文件
    代碼如下:
    //讀取EXCEL的方法 (用范圍區(qū)域讀取數(shù)據(jù))
    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;
    // 以只讀的形式打開(kāi)EXCEL文件
    Workbook wb = excel.Application.Workbooks.Open(strFileName, missing, true, missing, missing, missing,
    missing, missing, missing, true, missing, missing, missing, missing, missing);
    //取得第一個(gè)工作薄
    Worksheet ws = (Worksheet)wb.Worksheets.get_Item(1);
    //取得總記錄行數(shù)(包括標(biāo)題列)
    int rowsint = ws.UsedRange.Cells.Rows.Count; //得到行數(shù)
    //int columnsint = mySheet.UsedRange.Cells.Columns.Count;//得到列數(shù)
    //取得數(shù)據(jù)范圍區(qū)域(不包括標(biāo)題列)
    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;
    //將新值賦給一個(gè)數(shù)組
    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();//沒(méi)有更好的方法,只有殺掉進(jìn)程
    }
    GC.Collect();
    }
    方法三:將Excel文件轉(zhuǎn)化成CSV(逗號(hào)分隔)的文件,用文件流讀取(等價(jià)就是讀取一個(gè)txt文本文件)。
    先引用命名空間:
    代碼如下:
    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();
    另外也可以將數(shù)據(jù)庫(kù)數(shù)據(jù)導(dǎo)入到一個(gè)txt文件,實(shí)例如下:
    代碼如下:
    //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讀取數(shù)據(jù)
    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
    //把標(biāo)題寫(xiě)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 = "|"; //數(shù)據(jù)用"|"分隔開(kāi)
    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();//換行
    }
    strmWriter.Flush();
    strmWriter.Close();
    if(con.State==ConnectionState.Open)
    {
    con.Close();
    }