NET讀取Excel文件的方法
NET讀取Excel文件的方法
如何使得ASP.NET讀取Excel文件更加高效呢，下面小編就來告訴你三種.NET讀取Excel文件的方法。
ASP.NET讀取Excel文件方法一：采用OleDB讀取Excel文件：
把Excel文件當(dāng)做一個數(shù)據(jù)源來進(jìn)行數(shù)據(jù)的讀取操作，實(shí)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$]";
myCommand = new OleDbDataAdapter(strExcel, strConn);
ds = new DataSet(); myCommand.Fill(ds,"table1");
return ds;
}
對于Excel中的表即sheet([sheet1$])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 ) ;
ystem.Data.OleDb.OleDbCommandBuilder builder=new OleDbCommandBuilder(myCommand);
//QuotePrefix和QuoteSuffix主要是對builder生成InsertComment命令時使用。
builder.QuotePrefix="["; //獲取insert語句中保留字符(起始位置)
builder.QuoteSuffix="]"; //獲取insert語句中保留字符(結(jié)束位置)
DataSet newds=new DataSet();
myCommand.Fill(newds ,"Table1") ;
for(int i=0;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
{
nrow[j]=oldds.Tables[0].Rows[i][j];
}
newds.Tables["Table1"].Rows.Add(nrow);
}
myCommand.Update(newds,"Table1");
myConn.Close();
}
ASP.NET讀取Excel文件方法二：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("");
}
else
{
excel.Visible = false;
excel.UserControl = true; // 以只讀的形式打開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();//沒有更好的方法,只有殺掉進(jìn)程
}
GC.Collect();
}
ASP.NET讀取Excel文件方法三：將Excel文件轉(zhuǎn)化成CSV
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)庫數(shù)據(jù)導(dǎo)入到一個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)題寫入.txt文件中
//for (int i = 0; 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
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();
}