Develop Reference

How to import data from Excel using EPPlus to ASP.NET MVC, using C# and EF

I need to upload the information from an Excel xlsx file to my database through EF (Oracle), I use ASP.NET MVC and C#.
I tried to do this function but I don't know how to save the data in the database, I really don't know how to work with this tool is something totally new for.
What am I missing in my code to save the information? or if you know of any way to upload the information using the use of EPPlus that you can share.
[HttpPost]
public ActionResult CreateByFile(HttpPostedFileBase file)
{
Entities db = new Entities();
string path = "D:/Downloads/2023_Investment_Plan.xlsx";
var list = new List<TB_PR_MST_PROJECT>();
using (var stream = new MemoryStream())
{
FileInfo existingFile = new FileInfo(path);
using (var package = new ExcelPackage(existingFile))
{
ExcelWorksheet worksheet = package.Workbook.Worksheets[4];
var rowCount = worksheet.Dimension.Rows;
using (Entities dc = new Entities())
{
for (int row = 4; row <= rowCount; row++)
{
list.Add(new TB_PR_MST_PROJECT
{
PRJ_NAME = worksheet.Cells[row, 3].Value.ToString().Trim(),
PRJ_TEAM_DETAIL = worksheet.Cells[row, 9].Value.ToString().Trim(),
});
}
}
}
}
return View();
}
Edit #1: Add Savechanges
using (Entities dc = new Entities())
{
for (int row = 4; row <= rowCount; row++)
{
list.Add(new TB_PR_MST_PROJECT
{
PRJ_NAME = worksheet.Cells[row, 3].Value.ToString().Trim(),
PRJ_TEAM_DETAIL = worksheet.Cells[row, 9].Value.ToString().Trim(),
});
}
dc.SaveChanges();
}

Show Data from Excel Using C#

My code is here but i cannot get my required result
DataTable dtWB = new DataTable();
dtWB.Columns.Add("Name");
dtWB.Columns.Add("DOS");
dtWB.Columns.Add("CPT");
dtWB.AcceptChanges();
DataRow drWB = null;
// Auto-detect format, supports:
byte[] ExcelData = File.ReadAllBytes(AppDomain.CurrentDomain.BaseDirectory + path);
MemoryStream stream = new MemoryStream(ExcelData);
using (var reader = ExcelReaderFactory.CreateReader(stream))
{
// Choose one of either 1 or 2:
// 1. Use the reader methods
do
{
while (reader.Read())
{
// reader.GetDouble(0);
}
} while (reader.NextResult());
// 2. Use the AsDataSet extension method
var result = reader.AsDataSet();
//The result of each spreadsheet is in result.Tables
var Tables = result.Tables;
var CT = Tables.Count;
DataTable WBdt = Tables[1];
}
I have a data in an excel sheet like this
https://i.stack.imgur.com/nZl4K.png
I want to show data like this using c#.
https://i.stack.imgur.com/BjzZd.png

Your "Code" simply consists of the ExcelDataReader documentation sample. This will parse the dataset into a collection with the format you requested.
var records = new Dictionary<string, Dictionary<DateTime, double?>>();
using (var stream = File.Open(filePath, FileMode.Open, FileAccess.Read))
{
using (var reader = ExcelReaderFactory.CreateReader(stream))
{
var firstTable = reader.AsDataSet().Tables[0];
for (int i = 1; i < firstTable.Rows.Count; i++)
{
string name = firstTable.Rows[i].Field<string>(0);
var dt_values = new Dictionary<DateTime, double?>();
for (int j = 1; j < firstTable.Columns.Count; j++)
{
DateTime dt = firstTable.Rows[0].Field<DateTime>(j);
double? value = firstTable.Rows[i].Field<double?>(j);
dt_values.Add(dt, value);
}
records.Add(name, dt_values);
}
}
}
var formatted_data = records.SelectMany(x => x.Value.Select(y => new
{
Name = x.Key,
Dos = y.Key.ToShortDateString(),
CPT = y.Value
}));

Difficulties with C# + Excel

I have a problem.
I have an Excel File where sometimes the same customer is in 2 rows.
But not always.
Its like:
Click
Now, i want to create a DataGrid in C# which can list this in one row like:
Click
I know it would be easier to change the Excel file, but assume it wouldnt work that way(we get the file like this and we cant change it)
I know i could too just make another Excel File and make it with Excel(already did it this way, but we would need it more as C#)
Now i am at this point:
private void button2_Click(object sender, EventArgs e)
{
OpenFileDialog ofd = new OpenFileDialog() { Filter = "Excel Arbeitsmappe |*.xlsx", ValidateNames = true };
if (ofd.ShowDialog() == DialogResult.OK)
textBox1.Text = ofd.SafeFileName;
Excel.Application excelApp = new Excel.Application();
excelApp.Visible = false;
string filename = ofd.FileName;
Excel.Workbook workbook = excelApp.Workbooks.Open(filename);
Excel.Worksheet worksheet = workbook.Worksheets[1];
dataGridView1.ColumnCount = 2;
dataGridView1.Columns[0].Name = "Number";
dataGridView1.Columns[1].Name = "Street";
int rows = worksheet.UsedRange.Rows.Count;
for (int i = 2; i <= rows; i++)
{
string combinehr = worksheet.Cells[i, 150].Text + worksheet.Cells[i, 151].Text;
dataGridView1.Rows.Add(worksheet.Cells[i,29].Text, combinehr);
}
}
How do i expand it that it works like i want?
I would be so grateful
(sorry for the english)

With a reference to ExcelDataReader, ExcelDataReader.DataSet and DataSetExtensions (.Net) you can read the Excel file pretty easy into a DataSet, then you just have to work with the logic:
Input file:
using System;
using System.Data;
using System.IO;
using System.Linq;
using ExcelDataReader;
public DataTable GetTableFromExcel(string filePath)
{
DataSet ds = new DataSet();
using (var stream = System.IO.File.Open(filePath, System.IO.FileMode.Open, System.IO.FileAccess.Read))
{
using (var reader = ExcelReaderFactory.CreateReader(stream))
{
ds = reader.AsDataSet();
}
}
DataTable table = new DataTable();
table.Columns.Add(new DataColumn("CustomerNr"));
table.Columns.Add(new DataColumn("Address"));
// Set column names
for (int i = 0; i < ds.Tables[0].Columns.Count; i++)
{
// DataColumn.ColumnName can't be empty when DataColumn is part
// of a DataTable (throws ArgumentException)
string columnName = ds.Tables[0].Rows[0][i].ToString();
if (string.IsNullOrWhiteSpace(columnName))
{
columnName = $"Column{i}";
}
ds.Tables[0].Columns[i].ColumnName = columnName;
}
// Remove the first row containing the headers
ds.Tables[0].Rows.Remove(ds.Tables[0].Rows[0]);
// I don't have the benchmarks with me right now, but I've tested
// DataTable.Select vs DataTable.AsEnumerable.Select many times
// and the AsEnumerable method its faster, that's why you need the
// reference to System.Data.DataSetExtensions
var enumerableTable = ds.Tables[0].AsEnumerable();
// list of unique products
var products = enumerableTable.Select(row => row.Field<string>("Product")).Distinct();
// Add a column for each product
foreach (string product in products)
{
table.Columns.Add(new DataColumn(product));
}
// list of unique customers
var customerNumbers = enumerableTable.Select(row => row.Field<double>("CustomerNr")).Distinct();
foreach (var customerNumber in customerNumbers)
{
DataRow record = table.NewRow();
record["CustomerNr"] = customerNumber;
record["Address"] = enumerableTable.First(row => row.Field<double>("CustomerNr").Equals(customerNumber))[1];
for (int i = 2; i < table.Columns.Count; i++)
{
DataRow product = enumerableTable.FirstOrDefault(row => row.Field<double>("CustomerNr").Equals(customerNumber)
&& row.Field<string>("Product").Equals(table.Columns[i].ColumnName));
// Quantity = 0 if product is null
record[i] = product?["Quantity"] ?? 0;
}
table.Rows.Add(record);
}
return table;
}
Result DataTable:

The same result as #IvanGarcíaTopete via Microsoft.Office.Interop.Excel.
Class ExcelModel for Excel data:
public class ExcelModel
{
public string CustomerNr { get; set; }
public string Address { get; set; }
public string Product { get; set; }
public string Quantity { get; set; }
}
Read Excel and fill out model:
private void OpenReadExcel()
{
var dlg = new OpenFileDialog();
if (dlg.ShowDialog() != DialogResult.OK) return;
var exApp = new Microsoft.Office.Interop.Excel.Application();
Workbook exWbk = exApp.Workbooks.Open(dlg.FileName);
Worksheet wSh = exWbk.Sheets[1];
int k = 2;
Customers.Clear();
while (wSh.Cells[k, 1].Text != "" && wSh.Cells[k, 1].Value != null)
{
var rowExcelModel = new ExcelModel()
{
CustomerNr = wSh.Cells[k, 1].Text,
Address = wSh.Cells[k, 2].Text,
Product = wSh.Cells[k, 3].Text,
Quantity = wSh.Cells[k, 4].Text
};
Customers.Add(rowExcelModel);
k++;
}
exApp.Quit();
}
Generate Data table:
private void GenerateDataTable()
{
// unique products and customers
var products = Customers.Select(x => x.Product).Distinct().ToList();
var customers = Customers.Select(x => x.CustomerNr).Distinct().ToList();
// columns CustomerNr and Address
var dataTable = new System.Data.DataTable();
dataTable.Columns.Add(new DataColumn("CustomerNr"));
dataTable.Columns.Add(new DataColumn("Address"));
// columns for each product
foreach (var product in products)
{
dataTable.Columns.Add(new DataColumn(product));
}
//fill rows for each customers
foreach (var customer in customers)
{
var row = dataTable.NewRow();
row["CustomerNr"] = customer;
row["Address"] = Customers.Where(x => x.CustomerNr == customer).Select(x => x.Address).FirstOrDefault();
foreach (var product in products)
{
var quantity = Customers.Where(x => x.CustomerNr == customer && x.Product == product)
.Select(x => x.Quantity).FirstOrDefault();
row[product] = quantity ?? "0";
}
dataTable.Rows.Add(row);
}
dataGridView1.DataSource = dataTable;
}

Suspected issues with disposing Excel objects causing subsequent selenium tests to fail?

I've created several Selenium tests in C# for testing a login page. Each test uses a different pair of credentials sourced from the same Excel spreadsheet, and each runs great by itself. I found a great bit of code on the web for being able to read the Excel spreadsheet and locating the data in a specific row for use. The problem that I'm running into is that the tests only run to completion in isolation and not when they are run in a series. In the latter case, only the first one succeeds whereas all the subsequent tests fail with a "text cannot be null" exception. I am suspicious that it could be something to do with Excel not getting disposed of properly between each test. Any ideas on how I can properly clean up the Excel stuff?
Here is the code where I instantiate the Excel object:
string path1 = Path.Combine(AppDomain.CurrentDomain.SetupInformation.ApplicationBase, #"SeleniumData\LoginBook.xlsx");
ExcelLib loginBook = new ExcelLib(path1);
Here is where I call the workbook:
rmMain_PageObject pageRMMain = new rmLogin_PageObject().Login(loginBook.ReadData(1, "UserName"), (loginBook.ReadData(1, "Password")));
Here is the method itself:
using Excel;
using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace AutoTestProject1
{
public class ExcelLib
{
private DataTable ExcelToDataTable(string fileName)
{
//open file and returns as Stream
FileStream stream = File.Open(fileName, FileMode.Open, FileAccess.Read);
//Createopenxmlreader via ExcelReaderFactory
IExcelDataReader excelReader = ExcelReaderFactory.CreateOpenXmlReader(stream); //.xlsx
//Set the First Row as Column Name
excelReader.IsFirstRowAsColumnNames = true;
//Return as DataSet
DataSet result = excelReader.AsDataSet();
//Get all the Tables
DataTableCollection table = result.Tables;
//Store it in DataTable
DataTable resultTable = table["Sheet1"];
//return
return resultTable;
}
public ExcelLib(string fileName)
{
PopulateInCollection(fileName);
}
public class Datacollection
{
public int rowNumber { get; set; }
public int colNumber { get; set; } //test
public string colName { get; set; }
public string colValue { get; set; }
}
static List<Datacollection> dataCol = new List<Datacollection>();
private void PopulateInCollection(string fileName)
{
DataTable table = ExcelToDataTable(fileName);
//Iterate through the rows and columns of the Table
for (int row = 1; row <= table.Rows.Count; row++)
{
//for (int col = 0; col <= table.Columns.Count; col++)
for (int col = 0; col < table.Columns.Count; col++)
{
Datacollection dtTable = new Datacollection()
{
rowNumber = row,
colNumber = col, //test
colName = table.Columns[col].ColumnName,
colValue = table.Rows[row - 1][col].ToString()
};
//Add all the details for each row
dataCol.Add(dtTable);
}
}
}

var excelObject = new ExcelObject //what ever excel assy you are using
try{
}
catch(Exception e){
}
finally{
excelObject.Dispose();
}

EPPlus Reading Column Headers

Is there an easy way to tell EPPlus that a row is a header? Or should I create the headers by specifying a range using SelectedRange, remove it from the sheet and iterate the cells that remain?
I ended up doing this:
class Program
{
static void Main(string[] args)
{
DirectoryInfo outputDir = new DirectoryInfo(#"C:\testdump\excelimports");
FileInfo existingFile = new FileInfo(outputDir.FullName + #"\Stormers.xlsx");
Dictionary<string, string> arrColumnNames = new Dictionary<string,string>() { { "First Name", "" }, { "Last Name", "" }, { "Email Address", "" } };
using (ExcelPackage package = new ExcelPackage(existingFile))
{
ExcelWorksheet sheet = package.Workbook.Worksheets[1];
var q = from cell in sheet.Cells
where arrColumnNames.ContainsKey(cell.Value.ToString())
select cell;
foreach (var c in q)
{
arrColumnNames[c.Value.ToString()] = c.Address;
}
foreach (var ck in arrColumnNames)
{
Console.WriteLine("{0} - {1}", ck.Key, ck.Value);
}
var qValues = from r in sheet.Cells
where !arrColumnNames.ContainsValue(r.Address.ToString())
select r;
foreach (var r in qValues)
{
Console.WriteLine("{0} - {1}", r.Address, r.Value);
}
}
}
}

I needed to enumerate through header and display all the columns headers to my end user. I took Muhammad Mubashir code as base and changed/converted it to extension method and removed hard-coded numbers from it.
public static class ExcelWorksheetExtension
{
public static string[] GetHeaderColumns(this ExcelWorksheet sheet)
{
List<string> columnNames = new List<string>();
foreach (var firstRowCell in sheet.Cells[sheet.Dimension.Start.Row, sheet.Dimension.Start.Column, 1, sheet.Dimension.End.Column])
columnNames.Add(firstRowCell.Text);
return columnNames.ToArray();
}
}

var pck = new OfficeOpenXml.ExcelPackage();
pck.Load(new System.IO.FileInfo(path).OpenRead());
var ws = pck.Workbook.Worksheets["Worksheet1"];
DataTable tbl = new DataTable();
var hasHeader = true;
foreach (var firstRowCell in ws.Cells[1, 1, 1, ws.Dimension.End.Column]){
tbl.Columns.Add(hasHeader ? firstRowCell.Text : string.Format("Column {0}", firstRowCell.Start.Column));
}
var startRow = hasHeader ? 2 : 1;
for (var rowNum = startRow; rowNum <= ws.Dimension.End.Row; rowNum++){
var wsRow = ws.Cells[rowNum, 1, rowNum, ws.Dimension.End.Column];
var row = tbl.NewRow();
foreach (var cell in wsRow){
row[cell.Start.Column - 1] = cell.Text;
}
tbl.Rows.Add(row);
}

I had a similar issue. Here's some code that may help:
using (var package = new ExcelPackage(fileStream))
{
// Get the workbook in the file
var workbook = package.Workbook;
if (workbook != null && workbook.Worksheets.Any())
{
// Get the first worksheet
var sheet = workbook.Worksheets.First();
// Get header values
var column1Header = sheet.Cells["A1"].GetValue<string>();
var column2Header = sheet.Cells["B1"].GetValue<string>();
// "A2:A" means "starting from A2 (1st col, 2nd row),
// get me all populated cells in Column A" (yes, unusual range syntax)
var firstColumnRows = sheet.Cells["A2:A"];
// Loop through rows in the first column, get values based on offset
foreach (var cell in firstColumnRows)
{
var column1CellValue = cell.GetValue<string>();
var column2CellValue = cell.Offset(0, 1).GetValue<string>();
}
}
}
If anyone knows of a more elegant way than cell.Offset, let me know.

I just took ndd code and convert it with using of System Linq.
using System.Linq;
using OfficeOpenXml;
namespace Project.Extensions.Excel
{
public static class ExcelWorksheetExtension
{
/// <summary>
/// Get Header row with EPPlus.
/// <a href="https://stackoverflow.com/questions/10278101/epplus-reading-column-headers">
/// EPPlus Reading Column Headers
/// </a>
/// </summary>
/// <param name="sheet"></param>
/// <returns>Array of headers</returns>
public static string[] GetHeaderColumns(this ExcelWorksheet sheet)
{
return sheet.Cells[sheet.Dimension.Start.Row, sheet.Dimension.Start.Column, 1, sheet.Dimension.End.Column]
.Select(firstRowCell => firstRowCell.Text).ToArray();
}
}
}