I am trying to upload an excel file to a hosted Blazor webassembly application, for which I am using the following code:
string path= #"D:\Otros\LibrosExcel\ReferenciasDotación.xls";
FileInfo fileInfo = new FileInfo(path);
ExcelPackage.LicenseContext = LicenseContext.NonCommercial;
using (ExcelPackage excelPackage = new OfficeOpenXml.ExcelPackage(fileInfo))
{
//loop all worksheets
ExcelWorksheet worksheet = excelPackage.Workbook.Worksheets.FirstOrDefault();
//loop all rows
for (int i = 1; i <= worksheet.Dimension.End.Row; i++)
{
//loop all columns in a row
for (int j = 1; j <= worksheet.Dimension.End.Column; j++)
{
//add the cell data to the List
if (worksheet.Cells[i, j].Value != null)
{
excelData.Add(worksheet.Cells[i, j].Value.ToString());
}
}
}
}
return excelData;
but the line of code
ExcelWorksheet worksheet = excelPackage.Workbook.Worksheets.FirstOrDefault ();
returns null
Related
What would be the most efficient way to read an entire Excel file using ClosedXML and returning List<List<object>> ?
This somehow doesn't give me data. I get empty lists.
var wb = new XLWorkbook(finalFilePath);
var ws = wb.Worksheets.First();
var range = ws.RangeUsed();
var colCount = range.ColumnCount();
var rowCount = range.RowCount();
var i = 1;
var j = 1;
List<List<object>> data = new List<List<object>>();
while (i < rowCount + 1)
{
List<object> row = new List<object>();
while (j < colCount + 1)
{
row.Add(ws.Cell(i, j).Value);
j++;
}
data.Add(row);
i++;
}
This gets the job done:
Dictionary<Tuple<int, int>, object> data = new Dictionary<Tuple<int, int>, object>();
using (XLWorkbook wb = new XLWorkbook(filePath))
{
var ws = wb.Worksheets.First();
var range = ws.RangeUsed();
for (int i = 1; i < range.RowCount() + 1; i++)
{
for (int j = 1; j < range.ColumnCount() + 1; j++)
{
data.Add(new Tuple<int, int>(i,j), ws.Cell(i,j).Value);
}
}
}
I'm using the same code in 6 Areas, each a separate database. Been working fine for a long time, now fails in 3 of the 6 with a null reference exception. Classes all the same, all database tables hold data. First method is the view which displays the data, second called by a link in the view to export the data to Excel. 3 cases display and export correctly. In 2 out of the other 3 cases the data is displayed correctly in the view, and the null exception is thrown at the point the data should be being retrieved in the export method. In the last case the null exception is thrown when trying to return the view. Simply can't understand how it works in some instances but not in others.
public ActionResult PVS(string studySite, string currentFilter, int? page)
{
ViewBag.SelectedID = studySite;
if (studySite != null)
page = 1;
else
studySite = currentFilter;
ViewBag.CurrentFilter = studySite;
IQueryable<PVS> schedule = db.PVS.OrderBy(v => v.SiteNumber).ThenBy(v => v.Participant);
if (studySite != null)
{
string selectedID = studySite;
images = schedule.Where(v => v.SiteNumber == selectedID);
}
int pageSize = 10;
int pageNumber = (page ?? 1);
return View(schedule.ToPagedList(pageNumber, pageSize));
}
public void ExportPVSToExcel()
{
var grid = new System.Web.UI.WebControls.GridView();
var pvs = db.PVS.OrderBy(p => p.SiteNumber).ThenBy(p => p.Participant).ToList();
grid.DataSource = pvs;
grid.DataBind();
// create an Excel worksheet for the data export
ExcelPackage excel = new ExcelPackage();
var workSheet = excel.Workbook.Worksheets.Add("PVS");
var totalCols = grid.Rows[0].Cells.Count;
var totalRows = grid.Rows.Count;
var headerRow = grid.HeaderRow;
for (var i = 1; i <= totalCols; i++)
{
workSheet.Cells[1, i].Value = headerRow.Cells[i - 1].Text;
}
for (var j = 1; j <= totalRows; j++)
{
for (var i = 1; i <= totalCols; i++)
{
var data = pvs.ElementAt(j - 1);
workSheet.Cells[j + 1, i].Value = data.GetType().GetProperty(headerRow.Cells[i - 1].Text).GetValue(data, null);
}
}
using (var memoryStream = new MemoryStream())
{
Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
Response.AddHeader("content-disposition", "attachment; filename=PVS.xlsx");
excel.SaveAs(memoryStream);
memoryStream.WriteTo(Response.OutputStream);
Response.Flush();
Response.End();
}
}
I would like to generate a HTML table from an excel file. The EPPlus package provides a .net API for manipulating excel file. I would be happy to know whether it is possible to generate a HTML table code from an Excel file using EPPlus? I couldn't find anything on the documentation, but intuition tells me that there should be a way to do it
Thank you!
If you are looking for something built into EPPlus, I havent seen anything that will export directly HTML.
Best thing would be to bring in the Excel file to EPPlus and extract the data to a collection or DataTable. That should be pretty straight forward.
From there, there is plenty of documentation on how to get that to an html table. Quick search turned up this as the first hit:
Datatable to html Table
I wrote some code, you can try this.
static void Main(string[] args)
{
ExcelPackage p = new ExcelPackage(new System.IO.FileInfo("X.XLSX"));
var sheet = p.Workbook.Worksheets["HMTD"];
var noOfCol = sheet.Dimension.End.Column;
var noOfRow = sheet.Dimension.End.Row;
StringBuilder s = new StringBuilder();
s.Append("<table>");
for (int i = 1; i < noOfRow; i++)
{
s.Append("<tr>");
for (int j = 1; j < noOfCol; j++)
{
int colspan = 1;
int rowspan = 1;
if (!sheet.Cells[i, j].Merge || (sheet.Cells[i, j].Merge && isFirstMergeRange(sheet, sheet.Cells[i, j].Address, ref colspan, ref rowspan)))
{
s.Append("<td rowspan='" + rowspan + "' colspan='" + colspan + "'>");
if(sheet.Cells[i,j] != null && sheet.Cells[i,j].Value != null)
s.Append(sheet.Cells[i,j].Value.ToString());
s.Append("</td>");
}
}
s.Append("</tr>");
}
s.Append("</table>");
System.IO.File.WriteAllText("duc.html",s.ToString());
Console.ReadKey();
}
private static bool isFirstMergeRange(ExcelWorksheet sheet, string address, ref int colspan, ref int rowspan)
{
colspan = 1;
rowspan = 1;
foreach (var item in sheet.MergedCells)
{
var s = item.Split(':');
if (s.Length > 0 && s[0].Equals(address)){
ExcelRange range = sheet.Cells[item];
colspan = range.End.Column - range.Start.Column;
rowspan = range.End.Row - range.Start.Row;
if(colspan == 0) colspan = 1;
if(rowspan == 0) rowspan = 1;
return true;
}
}
return false;
}
Based on the answer from Duc Tran Minh, it works fine for me after I modified the code like this:
static void Main(string[] args)
{
ExcelPackage p = new ExcelPackage(new System.IO.FileInfo("X.XLSX"));
var sheet = p.Workbook.Worksheets["HMTD"];
var noOfCol = sheet.Dimension.End.Column;
var noOfRow = sheet.Dimension.End.Row;
StringBuilder s = new StringBuilder();
s.Append("<table>");
for (int i = 1; i <= noOfRow; i++)
{
s.Append("<tr>");
for (int j = 1; j <= noOfCol; j++)
{
int colspan = 1;
int rowspan = 1;
if (!sheet.Cells[i, j].Merge || (sheet.Cells[i, j].Merge && isFirstMergeRange(sheet, sheet.Cells[i, j].Address, ref colspan, ref rowspan)))
{
s.Append("<td rowspan='" + rowspan + "' colspan='" + colspan + "'>");
if(sheet.Cells[i,j] != null && sheet.Cells[i,j].Value != null)
s.Append(sheet.Cells[i,j].Value.ToString());
s.Append("</td>");
}
}
s.Append("</tr>");
}
s.Append("</table>");
System.IO.File.WriteAllText("duc.html",s.ToString());
Console.ReadKey();
}
bool isFirstMergeRange(ExcelWorksheet sheet, string address, ref int colspan, ref int rowspan)
{
colspan = 1;
rowspan = 1;
foreach (var item in sheet.MergedCells)
{
var s = item.Split(':');
if (s.Length > 0 && s[0].Equals(address))
{
ExcelRange range = sheet.Cells[item];
colspan = range.End.Column - range.Start.Column + 1;
rowspan = range.End.Row - range.Start.Row + 1;
return true;
}
}
return false;
}
im struggeling for below scenario.
Application displayed records of 100 suppliers in one table have three columns namely as ID,Company name and Subscription name.
i want to take input from my excel sheet say company name"xyz" and using that input i have to click on subscription name details link so application will navigates me next page.
Sample code i have created as below:
`public static void main(String[] args) throws BiffException, IOException, Exception {
WebDriver driver = new FirefoxDriver();
driver.manage().window().maximize();
driver.manage().timeouts().implicitlyWait(30,TimeUnit.SECONDS);
//Workbook location
Workbook wBook = Workbook.getWorkbook(new File("C:\Users\amit.bhagwat\Documents\TestData\SampleData.xls"));
//get sheet
jxl.Sheet Sheet = wBook.getSheet(0);
//loop
for(int i=1; i<Sheet.getRows(); i++)
{
driver.get("http://206.132.42.243/Web");
driver.manage().timeouts().implicitlyWait(30,TimeUnit.SECONDS);
driver.findElement(By.xpath("//input[#id='UserName']")).sendKeys(Sheet.getCell(0, i).getContents());
driver.manage().timeouts().implicitlyWait(30,TimeUnit.SECONDS);
driver.findElement(By.xpath("//input[#id='Password']")).sendKeys(Sheet.getCell(1, i).getContents());
driver.findElement(By.xpath("//input[#id='Password']")).sendKeys(Sheet.getCell(1, i).getContents());
Thread.sleep(40);
driver.findElement(By.xpath("//input[#name='Login']")).click();
driver.manage().timeouts().implicitlyWait(30,TimeUnit.SECONDS);
driver.manage().timeouts().implicitlyWait(30,TimeUnit.SECONDS);
driver.findElement(By.xpath("//a[contains(text(),'Task')]")).click();
driver.manage().timeouts().implicitlyWait(30,TimeUnit.SECONDS);
driver.findElement(By.xpath("//a[contains(text(),'Data Checking')]")).click();
jxl.Sheet Sheet2 = wBook.getSheet(0);
WebElement kancheck = driver.findElement(By.name("Grant & Brown"));
kancheck.click();
System.out.println(kancheck.isSelected());
driver.findElement(By.xpath("//a[contains(text(),'Data Checking')]")).sendKeys(Sheet2.getCell(1, i).getContents());
Thread.sleep(40);` enter code here
As far as I could understand, you are trying to read the file from a remote location and then read the information from it. It would be a good practice if you can use Apache POI library to read contents at run-time.
In my project, I read all the contents from an excel sheet usingApache POI library to set the values of my variables. Here is a code snippet on how i achieved it. Hopefully this will guide you to a proper solution. :)
public void readExcelDoc() throws FileNotFoundException, IOException
{
POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream("excelDoc//scripts.xls"));
HSSFWorkbook wb = new HSSFWorkbook(fs);
HSSFSheet sheet = wb.getSheetAt(0);
HSSFRow row = null;
HSSFCell cell = null;
int rows = 0; // No of rows
// rows = sheet.getPhysicalNumberOfRows();
rows = sheet.getLastRowNum();
int cols = 2; // No of columns
int tmp = 0;
// This trick ensures that we get the data properly even if it doesn't start from first few rows
for(int i = 0; i < 10 || i < rows; i++) {
row = sheet.getRow(i);
if(row != null) {
tmp = sheet.getRow(i).getPhysicalNumberOfCells();
if(tmp > cols) cols = tmp;
}
}
int testRowNo = 0;
String rowName = "Test Name";
String columnValue = " ";
//Iterate through Row and columns here. Excluding 1st row for title names
for(int r = 1; r <= rows; r++) {
row = sheet.getRow(r);
if(row != null) {
//Browse through columns using c
for(int c = 0; c < cols; c++) {
if(c==0) //Only taking data from Cell 0; Ignoring any other inputs
{
cell = row.getCell((short)c);
try
{
if(cell.getStringCellValue().contains(rowName))
{
testRowNo =row.getRowNum();
}
if(testRowNo > 0 )
{
if(cell.getColumnIndex() == 0 && row.getRowNum() > testRowNo && cell.getStringCellValue().length() !=0)
{
try{
String cellValue = cell.getStringCellValue().toLowerCase();
//System.out.println(cellValue);
scriptType.add(cellValue);
}
catch(IllegalStateException e)
{
e.printStackTrace();
scriptType.add(cell.getStringCellValue());
}
}
}
}
catch(NullPointerException e)
{
}
}
if(c==1)
{
cell = row.getCell((short)c); //this sets the column number
if(testRowNo == 0)
{
try{
String cellValue = cell.getStringCellValue();
//System.out.println(cellValue);
columnValue = cellValue;
}
catch(IllegalStateException e)
{
String cellValue = cell.toString();
columnValue = cellValue;
}
catch(NullPointerException e)
{
String cellValue = nodata;
columnValue = cellValue;
}
}
}
if(c==2)
{
cell = row.getCell((short)c); //this sets the column number
if(testRowNo == 0)
{
try{
String cellValue = cell.getStringCellValue();
//System.out.println(cellValue);
inputParameters.put(cellValue, columnValue);
}
catch(IllegalStateException e)
{
String cellValue = cell.toString();
inputParameters.put(cellValue, columnValue);
}
catch(NullPointerException e)
{
String cellValue = nodata;
inputParameters.put(cellValue, columnValue);
}
}
}
}
}
}
System.out.println("---------The parameters set from excel are : ---------");
#SuppressWarnings("rawtypes")
Iterator iterator = inputParameters.keySet().iterator();
while (iterator.hasNext()) {
String key = iterator.next().toString();
String value = inputParameters.get(key).toString();
System.out.println(key + " : " + value);
}
}
I am working with a C# Windows application. Trying to export data from gridview to Excel , but when the gridview column is empty I do get error message.
How to handle that? Please help
This is my code
// Store Header from Gridview to Excel
for (int i = 1; i < dgvresult.Columns.Count + 1; i++)
{
Excel.Cells[1, i] = dgvresult.Columns[i - 1].HeaderText;
}
// Loop rows and columns of Gridview to store to Excel
for (int i = 0; i < dgvresult.Rows.Count; i++)
{
for (int j = 0; j < dgvresult.Columns.Count; j++)
{
Excel.Cells[i + 2, j + 1] = dgvresult.Rows[i].Cells[j].Value.ToString(); // Here when the value in Gridview is empty error how to handle this
}
}
Excel.ActiveWorkbook.SaveCopyAs("D:\\Asserts.xls");
Excel.ActiveWorkbook.Saved = true;
Excel.Quit();
MessageBox.Show("Excel file created,you can find the file D:\\Asserts.xls");
Excel.Visible = true;
Found solution do a checking by code below
private void btnexport_Click(object sender, EventArgs e)
{
Microsoft.Office.Interop.Excel.ApplicationClass Excel = new Microsoft.Office.Interop.Excel.ApplicationClass();
Excel.Application.Workbooks.Add(Type.Missing);
Excel.Columns.ColumnWidth = 14;
// Store Header from Gridview to Excel
for (int i = 1; i < dgvresult.Columns.Count + 1; i++)
{
Excel.Cells[1, i] = dgvresult.Columns[i - 1].HeaderText;
}
// Loop rows and columns of Gridview to store to Excel
for (int i = 0; i < dgvresult.Rows.Count; i++)
{
for (int j = 0; j < dgvresult.Columns.Count; j++)
{
if (dgvresult.Rows[i].Cells[j].Value == null)
{
dgvresult.Rows[i].Cells[j].Value = "NA"; // Where the gridview is empty do a checking and Insert NA
}
Excel.Cells[i + 2, j + 1] = dgvresult.Rows[i].Cells[j].Value.ToString();
}
}
Excel.ActiveWorkbook.SaveCopyAs("D:\\Asserts.xls");
Excel.ActiveWorkbook.Saved = true;
Excel.Quit();
MessageBox.Show("Excel file created,you can find the file D:\\Asserts.xls");
Excel.Visible = true;
}