如何在 C# 中將 Word 轉換為 PDF

Microsoft Word Installation

Make sure you have Microsoft Word installed on your computer. The Interop services will use Word's built-in capabilities to handle the Word document and PDF conversion.

Visual Studio

A version of Visual Studio is necessary for creating, compiling, and running the C# program. If you don't already have Visual Studio, you can download the community version, which is free, from Microsoft's official website.

Install package Microsoft.Office.Interop.Word

This package is essential to provide the necessary functionalities for your C# program to interact with Word documents. It will be installed later using NuGet Package Manager, but knowing its importance in the conversion process is good.

Word Document for Conversion

Prepare a Word document or .docx file that you'd like to convert. Ensure you know its path on your machine, as you'll need to specify it in the C# program.

Sufficient Permissions

Ensure you can read the Word file and write the resulting PDF file to the desired directory. Running Visual Studio as an administrator can sometimes resolve permission-related issues.

With these prerequisites, you can set up your environment and convert your Word documents to PDF files.

Code Explanation

The beginning of our code includes a crucial namespace alias Word to refer to the Microsoft.Office.Interop.Word namespace easily. The System namespace provides classes fundamental to C# programming, and it's a staple in almost all C# applications.

The real action begins inside the Main method. We first create a new instance of the Word application using new Word.Application(). This step is akin to launching MS Word, but everything happens in the background, unseen by the user. Once the application instance is initialized, we instruct it to open a Word document with the wordApp.Documents.Open method. Specifying the path to your Word document in place of "path_to_your_word_file.docx" is crucial.

Now, having the document open, we determine where we want our PDF to be saved. This is specified in the outputPath variable. It's essential to note that the path should be adjusted to where you'd like your converted output PDF file to reside.

The magic of converting the Word document to PDF happens with the line wordDocument.ExportAsFixedFormat(...). The Interop services provide a built-in method, enabling the conversion without hassle. The method takes two primary arguments: the path where the PDF should be saved and the export format, which in our case is PDF.

Following the conversion, closing resources we've used is good practice. Thus, wordDocument.Close() ensures that the document we opened is now closed, while wordApp.Quit() ensures that the instance of the Word application we launched in the background is terminated.

Lastly, our program communicates the result to the user with a simple console message. The Console.WriteLine() method provides feedback, signaling that the conversion process was successfully executed.

Thus, Microsoft.Office.Interop.Word provides a suitable solution to handle and convert Word documents.

IronWord

IronWord is a .NET library purpose-built for reading and editing Word documents. With IronWord, you can load .docx documents directly edit them to fit your needs, no need for Microsoft Office Interop or Microsoft Word installations, before using IronPDF to handle the DOCX to PDF conversion.

Let's now take a look at IronWord in action, by creating a new document object and adding text to it:

using IronWord;
using IronWord.Models;
using IronWord.Models.Abstract;

WordDocument doc = new WordDocument();

TextContent text = new TextContent("This is some example text.");
text.Style = new TextStyle()
{
    Color = Color.Red,
    TextFont = new Font()
    {
        FontFamily = "Roboto",
        FontSize = 72,
    }
};
doc.AddText(text);
doc.Save("example.docx");

using IronWord;
using IronWord.Models;
using IronWord.Models.Abstract;

WordDocument doc = new WordDocument();

TextContent text = new TextContent("This is some example text.");
text.Style = new TextStyle()
{
    Color = Color.Red,
    TextFont = new Font()
    {
        FontFamily = "Roboto",
        FontSize = 72,
    }
};
doc.AddText(text);
doc.Save("example.docx");

Imports IronWord
Imports IronWord.Models
Imports IronWord.Models.Abstract

Private doc As New WordDocument()

Private text As New TextContent("This is some example text.")
text.Style = New TextStyle() With {
	.Color = Color.Red,
	.TextFont = New Font() With {
		.FontFamily = "Roboto",
		.FontSize = 72
	}
}
doc.AddText(text)
doc.Save("example.docx")

Output Word document

IronPDF

IronPDF is a full-featured PDF library for .NET, packed full of tools for PDF generation and manipulation. While one of it's crowning features is its high-quality HTML to PDF conversion capabilities, it is also capable of handling Word to PDF C# conversion tasks. For .NET developers looking to generate PDFs or edit existing PDF documents, IronPDF has you covered for all your needs.

So just how easy is IronPDF to use? Let's look at the following code example to see how it works when converting Word documents to PDF:

using IronPdf;

var renderer = new DocxToPdfRenderer();
var pdf = renderer.RenderDocxAsPdf("sample.docx");
pdf.SaveAs("example.pdf");

using IronPdf;

var renderer = new DocxToPdfRenderer();
var pdf = renderer.RenderDocxAsPdf("sample.docx");
pdf.SaveAs("example.pdf");

Imports IronPdf

Private renderer = New DocxToPdfRenderer()
Private pdf = renderer.RenderDocxAsPdf("sample.docx")
pdf.SaveAs("example.pdf")

PDF Output

Word to PDF Pipeline in C#

1. Load or create a Word document with IronWord
2. Edit or fill in dynamic data (e.g. replace tokens)
3. Save the .docx file
4. Use IronPDF to convert the document to PDF format
5. After, you can go on to use IronPDF to make any further adjustments to the newly rendered PDF, such as adding watermarks or annotations

This hybrid workflow offers maximum flexibility with minimal dependencies, ideal for web apps, cloud services, and desktop applications alike.

So how does this look in action?

Using IronWord for Document Creation

First we'll use IronWord to create an example Word document.

using IronWord;
using IronWord.Models;
using IronWord.Models.Abstract;

WordDocument doc = new WordDocument();

TextContent title = new TextContent("Example Report.");
TextContent text = new TextContent("Report created using IronWord, you can use this to create dynamic text and tables.");
title.Style = new TextStyle()
{
    TextFont = new Font()
    {
        FontSize = 72
    },
    IsBold = true,
};

Paragraph paragraph = new Paragraph();
paragraph.AddText(title);
paragraph.AddText(text);

doc.AddParagraph(paragraph);
doc.Save("example.docx");

using IronWord;
using IronWord.Models;
using IronWord.Models.Abstract;

WordDocument doc = new WordDocument();

TextContent title = new TextContent("Example Report.");
TextContent text = new TextContent("Report created using IronWord, you can use this to create dynamic text and tables.");
title.Style = new TextStyle()
{
    TextFont = new Font()
    {
        FontSize = 72
    },
    IsBold = true,
};

Paragraph paragraph = new Paragraph();
paragraph.AddText(title);
paragraph.AddText(text);

doc.AddParagraph(paragraph);
doc.Save("example.docx");

Imports IronWord
Imports IronWord.Models
Imports IronWord.Models.Abstract

Private doc As New WordDocument()

Private title As New TextContent("Example Report.")
Private text As New TextContent("Report created using IronWord, you can use this to create dynamic text and tables.")
title.Style = New TextStyle() With {
	.TextFont = New Font() With {.FontSize = 72},
	.IsBold = True
}

Dim paragraph As New Paragraph()
paragraph.AddText(title)
paragraph.AddText(text)

doc.AddParagraph(paragraph)
doc.Save("example.docx")

Output

Using IronPDF for Word to PDF C# Conversion

In just 3 simple lines of code, we'll be able to easily convert our Word document to PDF.

using IronPdf;

var renderer = new DocxToPdfRenderer();

var pdf = renderer.RenderDocxAsPdf("example.docx");

pdf.SaveAs("output.pdf");

using IronPdf;

var renderer = new DocxToPdfRenderer();

var pdf = renderer.RenderDocxAsPdf("example.docx");

pdf.SaveAs("output.pdf");

Imports IronPdf

Private renderer = New DocxToPdfRenderer()

Private pdf = renderer.RenderDocxAsPdf("example.docx")

pdf.SaveAs("output.pdf")

Output

Just like that, we were able to create a custom Word document with IronWord, before implementing IronPDF to convert it to PDF format in just a few lines of code.

Get Started Today

Install both libraries via the NuGet Package Manager to quickly implement them within your Visual Studio projects. Want to try before you buy? Download the free trial for IronPDF and IronWord today and start creating powerful documents right away.