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ASP.NET中三种操作Excel的方法

2012-05-30 17:39 627 查看
方法一 采用OleDB操作Excel文件(自己也写过支持全系列Excel,比较下):
①读取Excel,把Excel文件当作数据源,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;
}

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:

   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();

②写入Excel,实例如下:

   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();
}

方法二 使用Microsoft.Office.Interop.Excel.dll读取Excel文件:

   //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();
}

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):

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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