读条件的Excel文件

您好我正在写一个WinForm应用程序，我想读一个Excel文件。 我的excel是这样的：

------------------------------------------------------ first_name |last_name|ID |Skill |exam_date |certification_number| john | smith |12345678|engineer|2013/12/12|3543546647 john | smith |12345678|electronic|2013/07/12|35477776647 ..... ..... 

因为我的excel没有主键，正如你所看到的一个人，我可以有几行（最多20），其中前3列是相同的。

我写了这段代码来读取excel，但它只读了一行。如何读取具有相同ID的所有行？

 string ConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=F:\book3.xlsx;Extended Properties='Excel 12.0;HDR=YES;IMEX=1'"; DataSet ds = new DataSet(); OleDbDataAdapter adapter = new OleDbDataAdapter("SELECT * FROM [SHEET1$]", ConnectionString); adapter.Fill(ds); DataRow dataRow = (from DataRow dr in ds.Tables[0].Rows where dr["ID"].ToString() == textBox1.Text select dr).FirstOrDefault(); 

提前致谢

Answer 1

你的FirstOrDefault （）只select' First '

尝试这个：

 IEnumerable<DataRow> dataRows = (from DataRow dr in ds.Tables[0].Rows where dr["ID"].ToString() == textBox1.Text select dr); foreach (DataRow dataRow in dataRows) { // do stuff with current dataRow } 

Answer 2

 var query = from DataRow dr in ds.Tables[0].Rows where dr["ID"].ToString() == textBox1.Text select dr; foreach (DataRow dataRow in query.ToList()) { // do something with dataRow } 

Answer 3

在我的C＃应用​​程序中，我使用了EPPLUS库（ http://epplus.codeplex.com/ ）。这真的很好，很快，我会说。

这里是我的代码，使用EPPLUS打开一个文件的表单，并将数据加载到DataTable中：

 using System; using System.Collections.Generic; using System.Drawing; using System.Reflection; using System.Text; using System.Globalization; using System.Diagnostics; using System.Data; using System.Windows; using System.Windows.Controls; using System.IO; using OfficeOpenXml; using OfficeOpenXml.Style; using OfficeOpenXml.Drawing.Chart; using System.Xml; public class ProjectLoad { /// <summary> /// /// </summary> /// <param name="filePath"></param> public void Load ( string filePath ) { // Get the file we are going to process FileInfo existingFile = new FileInfo( filePath ); try { if ( existingFile.Exists == true ) { // Open and read the XlSX file. using ( ExcelPackage package = new ExcelPackage( existingFile ) ) { // Get the work book in the file ExcelWorkbook workBook = package.Workbook; if ( workBook != null ) { if ( workBook.Worksheets.Count > 0 ) { // read some data int sheet_number = 0; DataTable table = load_sheet_toDataGrid( workBook.Worksheets[sheet_number] ); } } } catch ( System.IO.IOException ) { //error message } } /// <summary> /// loads the content of a sheet into a datatable /// </summary> /// <param name="currentWorksheet"></param> /// <returns></returns> private DataTable load_sheet_toDataGrid ( ExcelWorksheet currentWorksheet ) { DataTable dt = new DataTable( ); int rows = currentWorksheet.Dimension.End.Row; int cols = currentWorksheet.Dimension.End.Column; //Add columns for ( int c = 0 ; c < cols ; c++ ) { dt.Columns.Add( currentWorksheet.Cells[0 + 1 , c + 1].Value.ToString( ) ); } //add values for ( int r = 1 ; r < rows ; r++ ) { object[] ob = new object[cols]; for ( int c = 0 ; c < cols ; c++ ) { double value; bool isDouble = Double.TryParse( currentWorksheet.Cells[r + 1 , c + 1].Value.ToString( ) , out value ); bool isDate = false; DateTime date = new DateTime( ); if ( c == 0 && !isDouble ) { isDate = DateTime.TryParse( currentWorksheet.Cells[r + 1 , c + 1].Value.ToString( ) , out date ); } if ( isDouble ) { ob[c] = value; } else if ( isDate ) { ob[c] = date; } else { ob[c] = currentWorksheet.Cells[r + 1 , c + 1].Value; } } dt.Rows.Add( ob ); } return dt; } }