How to Convert XLSX to CSV, JSON, XML and more in C#

Q: 如何在 C# 中将 XLSX 文件转换为 CSV？

要使用 IronXL 将 XLSX 文件转换为 CSV，首先通过 NuGet 包管理器安装库，使用 Install-Package IronXL.Excel 。接着，使用 IronXL 的方法加载 Excel 文件，必要时修改工作簿，然后将其导出为 CSV 文件。

Curtis Chau

已更新:八月 20, 2025

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IronXL can convert any Excel file into various formats.

These formats include: JSON, CSV, XML, and even older Excel formats such as XLS.

This brief article will show you how to use IronXL to convert to XML, convert to CSV, convert to JSON, and as a bonus, show you how to output an Excel worksheet as a dataset.

Quickstart: Convert an XLSX file to CSV with one line

This simple example shows how effortlessly IronXL lets you convert an existing Excel workbook into a CSV file in just one line. No manual parsing—just load your workbook and save it directly as CSV to get started immediately.

Install IronXL with NuGet Package Manager

PM > Install-Package IronXL.Excel

Copy and run this code snippet.

IronXL.WorkBook.Load("input.xlsx").SaveAsCsv("output.csv");

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Minimal Workflow (5 steps)

Download C# library to convert XLSX to CSV
Load existing XLSX Excel spreadsheet
Access or modify the workbook
Export to CSV file or several other formats including JSON, TSV, and XML
Check the output files and apply further processing

Step 1

1. Install the IronXL Library Free

First, you must have IronXL installed before you can use it in your applications. The following two methods allow you to install IronXL.

Download: https://ironsoftware.com/csharp/excel/docs/

Or use the NuGet Package Manager

Right-click the Solution name in Solution Explorer
Click Manage NuGet Packages
Browse for IronXL.Excel
Install

Install-Package IronXL.Excel

How to Tutorial

2. Convert to XML, JSON, CSV, XLS

Now you are ready.

Add the following code:

:path=/static-assets/excel/content-code-examples/how-to/csharp-convert-xlsx-csv-convert.cs

using IronXL;

// Load an existing Excel workbook
WorkBook workbook = WorkBook.Load("Normal_Excel_File.xlsx");

// Set metadata title for the workbook
workbook.Metadata.Title = "Normal_Excel_File.xlsx";

// Save the workbook in different formats
workbook.SaveAs("XLS_Export.xls");
workbook.SaveAs("XLSX_Export.xlsx");
workbook.SaveAsCsv("CSV_Export.csv");
workbook.SaveAsJson("JSON_Export.json");
workbook.SaveAsXml("XML_Export.xml");

// Convert the workbook to a DataSet, allowing integration with other data tools like DataGridView
System.Data.DataSet dataSet = workbook.ToDataSet();

IRON VB CONVERTER ERROR developers@ironsoftware.com

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The code above loads an ordinary XLSX file, adds a Title, then converts it to several formats. Lastly, it exports the Worksheet as a DataSet that gets used by a DataGridView object.

The various files exported are shown below.