1. IronXL
  2. Guides pratiques
  3. C# Éditer le fichier Excel
Comment modifier un fichier Excel en C#

C# Edit Excel File

Curtis Chau
Curtis Chau
Mis à jour:
This article was translated from English: Does it need improvement?
Translated
View the article in English

Developers have to be careful when they set out to modify and edit Excel files in C# because it can be easy for one misstep to change the whole document. Being able to rely on simple and efficient lines of code helps reduce the risk of error, and makes it easier for us to edit or delete Excel files programmatically. Today we'll walk through the steps necessary to edit Excel files in C# correctly and quickly using tested functions.

Quickstart: Edit a Specific Cell Value with IronXL

This example shows how easy it is to load an existing Excel file, update a single cell, and save the changes using IronXL. Get started in under 5 lines, no Interop required.

Nuget IconGet started making PDFs with NuGet now:

  1. Install IronXL with NuGet Package Manager

    PM > Install-Package IronXL.Excel

  2. Copy and run this code snippet.

    IronXL.WorkBook.Load("file.xlsx").GetWorkSheet("Sheet1")["C3"].Value = "Hello IronXL";
// then save your workbook
iroExcelWorkBook.SaveAs("file.xlsx");

  3. Deploy to test on your live environment

    Start using IronXL in your project today with a free trial
    arrow pointer

Minimal Workflow (5 steps)

  1. Download the C# Edit Excel Library
  2. Edit Specific Cell Values
  3. Edit full row values of an Excel SpreadSheet with a static value
  4. Edit full columns of Excel SpreadSheet values with a single value
  5. Edit Full Row with Dynamic Values
  6. Replace Spreadsheet Values
  7. Remove Row from Excel WorkSheet
  8. Remove WorkSheet from Excel File

Step 1

1. C# Edit Excel Files using the IronXL Library

For this tutorial, we'll be using the functions defined by IronXL, a C# Excel library. To use these functions you'll need to first download and install it into your project (free for development).

You can either Download IronXL.zip or read more and install via the NuGet package page.

Once you've installed it, let's get started!


Install-Package IronXL.Excel

Replace x.x.x with the appropriate version number as needed.

How to Tutorial

2. Edit Specific Cell Values

First, we will look at how to edit specific cell values of an Excel SpreadSheet.

For this purpose, we import the Excel SpreadSheet which is to be modified, and then access its WorkSheet. Then we can apply the modifications as shown below.

:path=/static-assets/excel/content-code-examples/how-to/csharp-edit-excel-file-specific-cell-value.cs
using IronXL;

// Load the Excel workbook
WorkBook wb = WorkBook.Load("sample.xlsx");
// Access a specific worksheet
WorkSheet ws = wb.GetWorkSheet("Sheet1");
// Access specific cell by identifying its row and column, then modify its value
ws.Rows[3].Columns[1].Value = "New Value";
// Save changes to the workbook
wb.SaveAs("sample.xlsx");
IRON VB CONVERTER ERROR developers@ironsoftware.com
$vbLabelText   $csharpLabel

Here are before and after screenshots of Excel SpreadSheet sample.xlsx:

Before After
before after

We can see how simple it is to modify the Excel SpreadSheet value.

If needed, there is also an alternative way to edit the specific cell value by cell address:

// Alternative way to access specific cell and apply changes
ws["B4"].Value = "New Value";
// Alternative way to access specific cell and apply changes
ws["B4"].Value = "New Value";
' Alternative way to access specific cell and apply changes
ws("B4").Value = "New Value"
$vbLabelText   $csharpLabel

3. Edit Full Row Values

It is pretty simple to edit full row values of an Excel SpreadSheet with a static value.

:path=/static-assets/excel/content-code-examples/how-to/csharp-edit-excel-file-row-value.cs
using IronXL;

WorkBook wb = WorkBook.Load("sample.xlsx");
WorkSheet ws = wb.GetWorkSheet("Sheet1");
// Setting a static value for the entire row
ws.Rows[3].Value = "New Value";
wb.SaveAs("sample.xlsx");
IRON VB CONVERTER ERROR developers@ironsoftware.com
$vbLabelText   $csharpLabel

See the screenshots of sample.xlsx below:

Before After
before after

For this, we also can edit the value of a specific range of the row, by using range function:

// Editing a specific range of a row
ws["A3:E3"].Value = "New Value";
// Editing a specific range of a row
ws["A3:E3"].Value = "New Value";
' Editing a specific range of a row
ws("A3:E3").Value = "New Value"
$vbLabelText   $csharpLabel

4. Edit Full Column Values

In the same way as above, we can easily edit full columns of Excel SpreadSheet values with a single value.

:path=/static-assets/excel/content-code-examples/how-to/csharp-edit-excel-file-full-column.cs
using IronXL;

WorkBook wb = WorkBook.Load("sample.xlsx");
WorkSheet ws = wb.GetWorkSheet("Sheet1");
// Setting a static value for the entire column
ws.Columns[1].Value = "New Value";
wb.SaveAs("sample.xlsx");
IRON VB CONVERTER ERROR developers@ironsoftware.com
$vbLabelText   $csharpLabel

Which will produce our sample.xlsx spreadsheet as such:

Before After
before after

5. Edit Full Row with Dynamic Values

Using IronXL, it is also possible to edit specific rows with dynamic values. This means we can edit a full row by assigning dynamic values for each cell. Let's see the example:

:path=/static-assets/excel/content-code-examples/how-to/csharp-edit-excel-file-full-row-dynamic.cs
using IronXL;
using System.Linq;

WorkBook wb = WorkBook.Load("sample.xlsx");
WorkSheet ws = wb.GetWorkSheet("Sheet1");
for (int i = 0; i < ws.Columns.Count(); i++)
{
    // Assign dynamic values to each cell in the row
    ws.Rows[3].Columns[i].Value = "New Value " + i.ToString();
}
wb.SaveAs("sample.xlsx");
IRON VB CONVERTER ERROR developers@ironsoftware.com
$vbLabelText   $csharpLabel

In the table below, we see the screenshots of Excel SpreadSheet sample.xlsx from this output:

Before After
before after

6. Edit Full Column with Dynamic Values

It is also simple to edit specific columns with dynamic values.

:path=/static-assets/excel/content-code-examples/how-to/csharp-edit-excel-file-full-column-dynamic.cs
using IronXL;
using System.Linq;

WorkBook wb = WorkBook.Load("sample.xlsx");
WorkSheet ws = wb.GetWorkSheet("Sheet1");
for (int i = 0; i < ws.Rows.Count(); i++)
{
    // Skip the first row if it's used as a header
    if (i == 0)
        continue;
    // Assign dynamic values to each cell in the column
    ws.Rows[i].Columns[1].Value = "New Value " + i.ToString();
}
wb.SaveAs("sample.xlsx");
IRON VB CONVERTER ERROR developers@ironsoftware.com
$vbLabelText   $csharpLabel

With the table results of sample.xlsx below:

Before After
before after

7. Replace Spreadsheet Values

If we want to replace any type of value with an updated value in an Excel SpreadSheet, we can use the function named Replace. Using this function, we can replace the data of Excel SpreadSheet in any required situation.

7.1. Replace Specific Value of Complete WorkSheet

To replace a specific value of a complete Excel WorkSheet with an updated value, we just access the WorkSheet ws (same as in the above examples) and apply the Replace function like this.

// Replace a specific value in the entire worksheet
ws.Replace("old value", "new value");
// Replace a specific value in the entire worksheet
ws.Replace("old value", "new value");
' Replace a specific value in the entire worksheet
ws.Replace("old value", "new value")
$vbLabelText   $csharpLabel

This function will replace old value with new value in a complete Excel WorkSheet.

Don't forget to save the file after any change, as shown in the examples above.

7.2. Replace the Values of Specific Row

If you only want to make changes to a specific row instead of the whole worksheet, use this code.

// Replace a specific value in a specific row
ws.Rows[2].Replace("old value", "new value");
// Replace a specific value in a specific row
ws.Rows[2].Replace("old value", "new value");
' Replace a specific value in a specific row
ws.Rows(2).Replace("old value", "new value")
$vbLabelText   $csharpLabel

The above code will replace old value with new value only in row number 2. The rest of the WorkSheet remains the same.

7.3. Replace the Values of Row Range

We also can replace the values within a specific range as follows:

// Replace specific values in a row range
ws["From Cell Address : To Cell Address"].Replace("old value", "new value");
// Replace specific values in a row range
ws["From Cell Address : To Cell Address"].Replace("old value", "new value");
' Replace specific values in a row range
ws("From Cell Address : To Cell Address").Replace("old value", "new value")
$vbLabelText   $csharpLabel

Suppose, if we want to replace an old value with a new value, just in the range from B4 to E4 of row no 4, then we would write it like this:

ws["B4:E4"].Replace("old value", "new value");
ws["B4:E4"].Replace("old value", "new value");
ws("B4:E4").Replace("old value", "new value")
$vbLabelText   $csharpLabel

7.4. Replace the Values of Specific Column

We can also replace the values of a specific column, and the rest of the worksheet remains the same.

// Replace specific values in a column
ws.Columns[1].Replace("old value", "new value");
// Replace specific values in a column
ws.Columns[1].Replace("old value", "new value");
' Replace specific values in a column
ws.Columns(1).Replace("old value", "new value")
$vbLabelText   $csharpLabel

The above code will replace old value with new value just for column number 1.

7.5. Replace the Values of Column Range

By the following way, we also can use the range function to replace within a range of a specific column.

// Replace specific values in a column range
ws["B5:B10"].Replace("old value", "new value");
// Replace specific values in a column range
ws["B5:B10"].Replace("old value", "new value");
' Replace specific values in a column range
ws("B5:B10").Replace("old value", "new value")
$vbLabelText   $csharpLabel

The above code will replace old value with new value just within range from B5 to B10 for column B.

8. Remove Row from Excel WorkSheet

IronXL provides a very simple function to remove a specific row of an Excel WorkSheet. Let's see the example.

:path=/static-assets/excel/content-code-examples/how-to/csharp-edit-excel-file-row-value.cs
using IronXL;

WorkBook wb = WorkBook.Load("sample.xlsx");
WorkSheet ws = wb.GetWorkSheet("Sheet1");
// Setting a static value for the entire row
ws.Rows[3].Value = "New Value";
wb.SaveAs("sample.xlsx");
IRON VB CONVERTER ERROR developers@ironsoftware.com
$vbLabelText   $csharpLabel

The above code will remove row number 3 of sample.xlsx as shown in the following table:

Before After
before after

9. Remove WorkSheet from Excel File

If we want to remove a complete WorkSheet of an Excel file, we can use the following method:

// Remove a worksheet by its index
wb.RemoveWorkSheet(1); // by sheet indexing
// Remove a worksheet by its index
wb.RemoveWorkSheet(1); // by sheet indexing
' Remove a worksheet by its index
wb.RemoveWorkSheet(1) ' by sheet indexing
$vbLabelText   $csharpLabel

wb is the WorkBook, same as in the above examples. If we want to remove a worksheet by name, then:

// Remove a worksheet by its name
wb.RemoveWorkSheet("Sheet1"); //by sheet name
// Remove a worksheet by its name
wb.RemoveWorkSheet("Sheet1"); //by sheet name
' Remove a worksheet by its name
wb.RemoveWorkSheet("Sheet1") 'by sheet name
$vbLabelText   $csharpLabel

IronXL is rich with many more functions by which we can easily perform any type of editing and deletion in Excel SpreadSheets. Please reach out to our dev team if you have any questions for use in your project.

Library Quick Access

IronXL Library Documentation

Explore the full capabilities of IronXL C# Library with various functions for editing, deleting, styling, and perfecting your Excel workbooks.

IronXL Library Documentation
Documentation related to 9. Remove WorkSheet from Excel File

Questions Fréquemment Posées

Comment puis-je modifier des fichiers Excel en C# sans utiliser Interop?

Vous pouvez modifier des fichiers Excel en C# sans utiliser Interop en utilisant la bibliothèque IronXL. IronXL offre une variété de méthodes pour modifier les documents Excel, telles que l'édition de cellules, de lignes et de colonnes, et même la suppression de feuilles de calcul.

Comment puis-je modifier les valeurs de cellule dans un fichier Excel en utilisant IronXL?

Pour modifier les valeurs de cellule dans un fichier Excel en utilisant IronXL, chargez le classeur Excel et accédez à la feuille de calcul spécifique. Vous pouvez changer la valeur de la cellule en spécifiant les indices de ligne et de colonne, puis en enregistrant le classeur.

Quelle est la méthode pour remplacer des valeurs dans une application Excel C#?

Dans une application Excel C#, vous pouvez remplacer des valeurs en utilisant la fonction Replace d'IronXL. Cela vous permet de remplacer des valeurs spécifiques sur l'ensemble de la feuille de calcul, dans une ligne, une colonne ou une plage particulière.

Comment puis-je supprimer une feuille de calcul d'un fichier Excel par programmation en C#?

Vous pouvez supprimer une feuille de calcul d'un fichier Excel par programmation en C# en utilisant la méthode RemoveWorkSheet d'IronXL. Vous pouvez spécifier la feuille de calcul à supprimer par son nom ou son index.

Puis-je modifier des lignes entières dans un fichier Excel en utilisant C#?

Oui, avec IronXL, vous pouvez modifier des lignes entières dans un fichier Excel en utilisant C#. Vous pouvez attribuer soit des valeurs statiques soit dynamiques aux cellules d'une ligne en parcourant les colonnes.

Est-il possible de définir une valeur statique pour une colonne entière dans un fichier Excel?

Oui, IronXL vous permet de définir une valeur statique pour une colonne entière dans un fichier Excel. Vous pouvez également utiliser des valeurs dynamiques si nécessaire, en parcourant chaque cellule de la colonne.

Comment puis-je supprimer une ligne spécifique d'une feuille de calcul Excel en utilisant C#?

Pour supprimer une ligne spécifique d'une feuille de calcul Excel en utilisant C#, utilisez la méthode RemoveRow de la bibliothèque IronXL, en spécifiant la ligne que vous souhaitez supprimer.

Quelles sont les premières étapes pour commencer à modifier des fichiers Excel en utilisant C#?

Pour commencer à modifier des fichiers Excel en utilisant C#, téléchargez et installez d'abord la bibliothèque IronXL. Ensuite, chargez votre classeur Excel, sélectionnez la feuille de calcul que vous souhaitez modifier et utilisez les fonctions d'IronXL pour modifier les cellules, les lignes, les colonnes ou les feuilles de calcul si nécessaire.

IronXL est-il adapté aux environnements de développement?

Oui, IronXL est très adapté aux environnements de développement. Il peut être utilisé librement à des fins de développement et offre une suite complète de fonctions pour éditer les fichiers Excel par programmation.

Comment puis-je convertir un fichier Excel en un format différent en utilisant C#?

IronXL permet la conversion de fichiers Excel en différents formats en utilisant ses fonctions d'exportation. Vous pouvez enregistrer votre classeur Excel modifié dans des formats tels que CSV, HTML ou PDF en utilisant les méthodes d'IronXL.

Curtis Chau
Curtis Chau
  Discutez maintenant avec l'équipe d'ingénierie
Rédacteur technique

Curtis Chau détient un baccalauréat en informatique (Université de Carleton) et se spécialise dans le développement front-end avec expertise en Node.js, TypeScript, JavaScript et React. Passionné par la création d'interfaces utilisateur intuitives et esthétiquement plaisantes, Curtis aime travailler avec des frameworks modernes ...

Lire la suite
Prêt à commencer?
Nuget Téléchargements 1,686,155 | Version : 2025.11 vient de sortir