c# 使用 oledb 从 excel 读取错误

Question

 private void OnCreated(object sender, FileSystemEventArgs e)
        {
            excelDataSet.Clear();
            string extension = Path.GetExtension(e.FullPath);
            if (extension == ".xls" || extension == ".xlsx")
            {
                string ConnectionString = "";
                if (extension == ".xls") { ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0; Data Source = '" + e.FullPath + "';Extended Properties=\"Excel 8.0;HDR=YES;\""; }
                if (extension == ".xlsx") { ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0; Data Source = '" + e.FullPath + "';Extended Properties=\"Excel 12.0;HDR=YES;\""; }

                using (OleDbConnection conn = new OleDbConnection(ConnectionString))
                {
                    conn.Open();
                    OleDbDataAdapter objDA = new OleDbDataAdapter("select * from [Sheet1$]", conn);
                    objDA.Fill(excelDataSet);
                    conn.Close();
                    conn.Dispose();
                }
            }
        }

This is my code. It's working when my filewatcher triggers. Problem is the excel file I read has 1 header row and 3 row that has values. When I use this code and check my dataset row count I get 9.. I've no idea where does it take that 9 from, am I doing something wrong? I'm checking my code for last 30-35 min and still couldn't find what I'm doing wrong.. I get the column's right but the rows are not working. I don't need the header line btw

Update: my example excel file had 3 rows and I was getting 9 as row count. I just copied these rows and made my file 24 row + 1 header row and when I did rows.count I got 24 as answer. So it worked fine? Is that normal?

Answer 1

There is a Nuget called Linq to Excel. I used this nuget in several projects to query the data inside.csv and.xlsx files without any difficulty, it is easy to implement. It might be poor in performance but it can resolve your problem.

Here is the documentation of Linq to Excel

Answer 2

I would highly recommend you to take a look at EPPLUS library https://github.com/JanKallman/EPPlus/wiki

I have plently of trouble with oledb until i found EPPLUS. It's really easy to use for creating and updating excel files. There are plenty of good examples out there like the one under which is from How do i iterate through rows in an excel table using epplus?

var package = new ExcelPackage(new FileInfo("sample.xlsx"));

ExcelWorksheet workSheet = package.Workbook.Worksheets[1];
var start = workSheet.Dimension.Start;
var end = workSheet.Dimension.End;
for (int row = start.Row; row <= end.Row; row++)
{ // Row by row...
    for (int col = start.Column; col <= end.Column; col++)
    { // ... Cell by cell...
        object cellValue = workSheet.Cells[row, col].Text; // This got me the actual value I needed.
    }
}