使用IronPDF在.NET MAUI中創建PDF文件

IronPDF 功能

IronPDF is a powerful PDF converter that can handle almost any task that a browser can handle. The .NET library for developers makes it simple to create, read, and manipulate PDF files. IronPDF uses the Google Chrome engine to convert HTML to PDF files. Among other web technologies, IronPDF supports HTML, ASPX, Converting Razor Pages to PDF with IronPDF, and MVC View. IronPDF supports Microsoft .NET applications (both ASP.NET Web Applications and traditional Windows Applications). IronPDF can also be used to make attractive PDF documents.

IronPDF can create PDF files from HTML files with JavaScript and CSS containing JavaScript, CSS, and image files.

Not only can convert HTML files to PDF with IronPDF, but you can also convert image files to PDF.

IronPDF can help to create interactive PDF documents, fill out and submit interactive forms with IronPDF, merge and split PDF documents, extract text and images from PDFs from PDF documents, search text in PDF documents, rasterize PDF pages to images, convert PDF to HTML, and print PDF documents using IronPrint.

IronPDF can generate a document from a URL. For login behind HTML using IronPDF for login forms, it also allows the use of custom network login credentials, user agents, proxies, cookies, HTTP headers, and form variables.

IronPDF is a library that can read and fill in PDF documents and is capable of extracting images from documents. It allows us to add headers and footers to PDF files, text, photos, bookmarks for easier navigation, watermarks, and more to documents. It also allows us to join and split pages in a new or existing document. IronPDF is capable of converting documents to PDF objects without using an Acrobat viewer. It is also possible to convert a CSS file to a PDF document and CSS media-type files can be converted into documents.

在 Visual Studio 中創建新專案

Firstly, create a project using both Visual Studio Code and Visual Studio. When using Visual Studio Code, it is necessary to use the command-line tool to install the project type template.

Open the Microsoft Visual Studio software and go to the File menu. Select "new project," and in the new project window select ".NET MAUI App." This article will use a .NET MAUI App to generate PDF documents and save them to a suitable location.

Create a new project in Visual Studio

在相應的文本框中輸入項目名稱並選擇文件路徑。 Then, click the Create button, as in the screenshot below.

Configure the project

The Visual Studio project will now generate the structure for the selected application following the .NET MAUI App platform. It will now open the MainPage.cs file to add code and build/run the application.

Adding code into the MainPage.cs file

Next, install the library to test the code.

Install the IronPDF Library

可以用四種方式下載並安裝IronPDF庫。

這些是：

• Using Visual Studio.
• Using the Visual Studio Command-Line.
• Direct download from the NuGet website.
• Direct download from the IronPDF website.

Install-Package IronPdf

Create PDFs on a .NET MAUI app using IronPDF

When a project is created, there will be an auto-generated file called MainPage.xaml. This is where to put the UI of the .NET MAUI application.

Follow the code below.

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="MAUI_PDF.MainPage"
            >

    <ScrollView>
        <VerticalStackLayout
            Spacing="25"
            Padding="30,0"
            VerticalOptions="Center">

            <Image
                Source="dotnet_bot.png"
                SemanticProperties.Description="Cute .NET bot waving hi to you!"
                HeightRequest="200"
                HorizontalOptions="Center" />

            <Label
                Text="Welcome to IronPDF!"
                SemanticProperties.HeadingLevel="Level1"
                FontSize="32"
                HorizontalOptions="Center" />

            <Button
                x:Name="PdfBtn"
                Text="Click me to generate PDF"
                SemanticProperties.Hint="Click button to generate PDF"
                Clicked="GeneratePDF"
                HorizontalOptions="Center" />
        </VerticalStackLayout>
    </ScrollView>

</ContentPage>

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="MAUI_PDF.MainPage"
            >

    <ScrollView>
        <VerticalStackLayout
            Spacing="25"
            Padding="30,0"
            VerticalOptions="Center">

            <Image
                Source="dotnet_bot.png"
                SemanticProperties.Description="Cute .NET bot waving hi to you!"
                HeightRequest="200"
                HorizontalOptions="Center" />

            <Label
                Text="Welcome to IronPDF!"
                SemanticProperties.HeadingLevel="Level1"
                FontSize="32"
                HorizontalOptions="Center" />

            <Button
                x:Name="PdfBtn"
                Text="Click me to generate PDF"
                SemanticProperties.Hint="Click button to generate PDF"
                Clicked="GeneratePDF"
                HorizontalOptions="Center" />
        </VerticalStackLayout>
    </ScrollView>

</ContentPage>

Once the above code is added to the MainPage.xaml file, open the MainPage.xaml.cs file and include the following method inside of the MainPage class:

private void GeneratePDF(object sender, EventArgs e)
{
    ChromePdfRenderer renderer = new ChromePdfRenderer();
    var doc = renderer.RenderHtmlAsPdf("<h1>Hello IronPDF!</h1> <p>I'm using IronPDF MAUI!</p>");

    // Saves the memory stream as file.
    SaveService saveService = new SaveService();
    saveService.SaveAndView("IronPDF HTML string.pdf", "application/pdf", doc.Stream);
}

private void GeneratePDF(object sender, EventArgs e)
{
    ChromePdfRenderer renderer = new ChromePdfRenderer();
    var doc = renderer.RenderHtmlAsPdf("<h1>Hello IronPDF!</h1> <p>I'm using IronPDF MAUI!</p>");

    // Saves the memory stream as file.
    SaveService saveService = new SaveService();
    saveService.SaveAndView("IronPDF HTML string.pdf", "application/pdf", doc.Stream);
}

Private Sub GeneratePDF(ByVal sender As Object, ByVal e As EventArgs)
	Dim renderer As New ChromePdfRenderer()
	Dim doc = renderer.RenderHtmlAsPdf("<h1>Hello IronPDF!</h1> <p>I'm using IronPDF MAUI!</p>")

	' Saves the memory stream as file.
	Dim saveService As New SaveService()
	saveService.SaveAndView("IronPDF HTML string.pdf", "application/pdf", doc.Stream)
End Sub

The GeneratePDF method generates a new PDF document containing the text "Hello, IronPDF!..." and saves it on the users' computer at a specified location.

In the method above, a new ChromePdfRenderer object is created and invokes the RenderHtmlAsPdf method to produce a new PDF document containing the words "Hello IronPDF! ..." from a string of HTML markup. Next, it will be delegated the saving of the file on the user's device to a separate class, called SaveService. This class will be created in the next step.

The complete MainPage.xaml.cs file is given below. Please ensure that the file contents match what's shown below before continuing to the next step:

// Change the namespace as desired, but make sure that all source files use this same namespace,
// or there will be errors!
namespace MAUI_IronPDF;    

// This namespace is required to make use of IronPDF functionality
using IronPdf;

public partial class MainPage : ContentPage
{
    public MainPage()
    {
        InitializeComponent();
    }

    private void GeneratePDF(object sender, EventArgs e)
    {
        ChromePdfRenderer renderer = new ChromePdfRenderer();
        var doc = renderer.RenderHtmlAsPdf("<h1>Hello IronPDF!</h1> <p>I'm using IronPDF MAUI!</p>");
        // Saves the memory stream as file.
        SaveService saveService = new SaveService();
        saveService.SaveAndView("IronPDF HTML string.pdf", "application/pdf", doc.Stream);
    }
}

// Change the namespace as desired, but make sure that all source files use this same namespace,
// or there will be errors!
namespace MAUI_IronPDF;    

// This namespace is required to make use of IronPDF functionality
using IronPdf;

public partial class MainPage : ContentPage
{
    public MainPage()
    {
        InitializeComponent();
    }

    private void GeneratePDF(object sender, EventArgs e)
    {
        ChromePdfRenderer renderer = new ChromePdfRenderer();
        var doc = renderer.RenderHtmlAsPdf("<h1>Hello IronPDF!</h1> <p>I'm using IronPDF MAUI!</p>");
        // Saves the memory stream as file.
        SaveService saveService = new SaveService();
        saveService.SaveAndView("IronPDF HTML string.pdf", "application/pdf", doc.Stream);
    }
}

Imports IronPdf

' Change the namespace as desired, but make sure that all source files use this same namespace,
' or there will be errors!
Namespace MAUI_IronPDF

	' This namespace is required to make use of IronPDF functionality

	Partial Public Class MainPage
		Inherits ContentPage

		Public Sub New()
			InitializeComponent()
		End Sub

		Private Sub GeneratePDF(ByVal sender As Object, ByVal e As EventArgs)
			Dim renderer As New ChromePdfRenderer()
			Dim doc = renderer.RenderHtmlAsPdf("<h1>Hello IronPDF!</h1> <p>I'm using IronPDF MAUI!</p>")
			' Saves the memory stream as file.
			Dim saveService As New SaveService()
			saveService.SaveAndView("IronPDF HTML string.pdf", "application/pdf", doc.Stream)
		End Sub
	End Class
End Namespace

Now, create a new class file called SaveService.cs in the root of the project and add the following source code:

// Change the namespace as desired, but make sure that all source files use this same namespace,
// or there will be errors!
namespace MAUI_IronPDF
{
    // SaveService partial class declaration ... this allows a layer of abstraction
    // as we implement the save file details specially for each platform on which this app will
    // operate! 
    public partial class SaveService
    {
        public void SaveAndView(string filename, string contentType, MemoryStream stream)
        {
            SaveFile(filename, contentType, stream);
        }

        // Additional partial files will provide implementations for this method specifically.
        partial void SaveFile(string filename, string contentType, MemoryStream stream);
    }
}

// Change the namespace as desired, but make sure that all source files use this same namespace,
// or there will be errors!
namespace MAUI_IronPDF
{
    // SaveService partial class declaration ... this allows a layer of abstraction
    // as we implement the save file details specially for each platform on which this app will
    // operate! 
    public partial class SaveService
    {
        public void SaveAndView(string filename, string contentType, MemoryStream stream)
        {
            SaveFile(filename, contentType, stream);
        }

        // Additional partial files will provide implementations for this method specifically.
        partial void SaveFile(string filename, string contentType, MemoryStream stream);
    }
}

' Change the namespace as desired, but make sure that all source files use this same namespace,
' or there will be errors!
Namespace MAUI_IronPDF
	' SaveService partial class declaration ... this allows a layer of abstraction
	' as we implement the save file details specially for each platform on which this app will
	' operate! 
	Partial Public Class SaveService
		Public Sub SaveAndView(ByVal filename As String, ByVal contentType As String, ByVal stream As MemoryStream)
			SaveFile(filename, contentType, stream)
		End Sub

		' Additional partial files will provide implementations for this method specifically.
		Partial Private Sub SaveFile(ByVal filename As String, ByVal contentType As String, ByVal stream As MemoryStream)
		End Sub
	End Class
End Namespace

Since the implementation details for saving content on user devices vary with each platform (Windows, Android, macOS, etc), it is necessary to write platform-specific code for each device type that the application will support. To make this possible, we define SaveService as a partial class (for abstraction purposes) containing one partial method, called SaveAndView. Following this, the implementation of this method will be defined in a separate SaveService.cs partial class for one or more of the folders nested in the Platforms folder within the Solutions Explorer (see image below):

The folder structure to implement cross-platform

For simplicity, this tutorial will define the aforementioned partial file for the Windows platform only. Create a new SaveService.cs file under the Windows platform folder containing the code shown below:

using Windows.Storage;
using Windows.Storage.Pickers;
using Windows.Storage.Streams;
using Windows.UI.Popups;

namespace MAUI_IronPDF;

public partial class SaveService
{
    async partial void SaveFile(string filename, string contentType, MemoryStream stream)
    {
        StorageFile stFile;
        string extension = Path.GetExtension(filename);
        // Gets process windows handle to open the dialog in application process.
        IntPtr windowHandle = System.Diagnostics.Process.GetCurrentProcess().MainWindowHandle;
        if (!Windows.Foundation.Metadata.ApiInformation.IsTypePresent("Windows.Phone.UI.Input.HardwareButtons"))
        {
            // Creates file save picker to save a file.
            FileSavePicker savePicker = new();
            savePicker.DefaultFileExtension = ".pdf";
            savePicker.SuggestedFileName = filename;
            // Saves the file as PDF file.
            savePicker.FileTypeChoices.Add("PDF", new List<string>() { ".pdf" });

            WinRT.Interop.InitializeWithWindow.Initialize(savePicker, windowHandle);
            stFile = await savePicker.PickSaveFileAsync();
        }
        else
        {
            StorageFolder local = ApplicationData.Current.LocalFolder;
            stFile = await local.CreateFileAsync(filename, CreationCollisionOption.ReplaceExisting);
        }
        if (stFile != null)
        {
            using (IRandomAccessStream zipStream = await stFile.OpenAsync(FileAccessMode.ReadWrite))
            {
                // Writes compressed data from memory to file.
                using Stream outstream = zipStream.AsStreamForWrite();
                outstream.SetLength(0);
                // Saves the stream as file.
                byte [] buffer = stream.ToArray();
                outstream.Write(buffer, 0, buffer.Length);
                outstream.Flush();
            }
            // Create message dialog box.
            MessageDialog msgDialog = new("Do you want to view the document?", "File has been created successfully");
            UICommand yesCmd = new("Yes");
            msgDialog.Commands.Add(yesCmd);
            UICommand noCmd = new("No");
            msgDialog.Commands.Add(noCmd);

            WinRT.Interop.InitializeWithWindow.Initialize(msgDialog, windowHandle);

            // Showing a dialog box.
            IUICommand cmd = await msgDialog.ShowAsync();
            if (cmd.Label == yesCmd.Label)
            {
                // Launch the saved file.
                await Windows.System.Launcher.LaunchFileAsync(stFile);
            }
        }
    }
}

using Windows.Storage;
using Windows.Storage.Pickers;
using Windows.Storage.Streams;
using Windows.UI.Popups;

namespace MAUI_IronPDF;

public partial class SaveService
{
    async partial void SaveFile(string filename, string contentType, MemoryStream stream)
    {
        StorageFile stFile;
        string extension = Path.GetExtension(filename);
        // Gets process windows handle to open the dialog in application process.
        IntPtr windowHandle = System.Diagnostics.Process.GetCurrentProcess().MainWindowHandle;
        if (!Windows.Foundation.Metadata.ApiInformation.IsTypePresent("Windows.Phone.UI.Input.HardwareButtons"))
        {
            // Creates file save picker to save a file.
            FileSavePicker savePicker = new();
            savePicker.DefaultFileExtension = ".pdf";
            savePicker.SuggestedFileName = filename;
            // Saves the file as PDF file.
            savePicker.FileTypeChoices.Add("PDF", new List<string>() { ".pdf" });

            WinRT.Interop.InitializeWithWindow.Initialize(savePicker, windowHandle);
            stFile = await savePicker.PickSaveFileAsync();
        }
        else
        {
            StorageFolder local = ApplicationData.Current.LocalFolder;
            stFile = await local.CreateFileAsync(filename, CreationCollisionOption.ReplaceExisting);
        }
        if (stFile != null)
        {
            using (IRandomAccessStream zipStream = await stFile.OpenAsync(FileAccessMode.ReadWrite))
            {
                // Writes compressed data from memory to file.
                using Stream outstream = zipStream.AsStreamForWrite();
                outstream.SetLength(0);
                // Saves the stream as file.
                byte [] buffer = stream.ToArray();
                outstream.Write(buffer, 0, buffer.Length);
                outstream.Flush();
            }
            // Create message dialog box.
            MessageDialog msgDialog = new("Do you want to view the document?", "File has been created successfully");
            UICommand yesCmd = new("Yes");
            msgDialog.Commands.Add(yesCmd);
            UICommand noCmd = new("No");
            msgDialog.Commands.Add(noCmd);

            WinRT.Interop.InitializeWithWindow.Initialize(msgDialog, windowHandle);

            // Showing a dialog box.
            IUICommand cmd = await msgDialog.ShowAsync();
            if (cmd.Label == yesCmd.Label)
            {
                // Launch the saved file.
                await Windows.System.Launcher.LaunchFileAsync(stFile);
            }
        }
    }
}

Imports Windows.Storage
Imports Windows.Storage.Pickers
Imports Windows.Storage.Streams
Imports Windows.UI.Popups

Namespace MAUI_IronPDF

	Partial Public Class SaveService
		Private Async Sub SaveFile(ByVal filename As String, ByVal contentType As String, ByVal stream As MemoryStream)
			Dim stFile As StorageFile
			Dim extension As String = Path.GetExtension(filename)
			' Gets process windows handle to open the dialog in application process.
			Dim windowHandle As IntPtr = System.Diagnostics.Process.GetCurrentProcess().MainWindowHandle
			If Not Windows.Foundation.Metadata.ApiInformation.IsTypePresent("Windows.Phone.UI.Input.HardwareButtons") Then
				' Creates file save picker to save a file.
				Dim savePicker As New FileSavePicker()
				savePicker.DefaultFileExtension = ".pdf"
				savePicker.SuggestedFileName = filename
				' Saves the file as PDF file.
				savePicker.FileTypeChoices.Add("PDF", New List(Of String)() From {".pdf"})

				WinRT.Interop.InitializeWithWindow.Initialize(savePicker, windowHandle)
				stFile = Await savePicker.PickSaveFileAsync()
			Else
				Dim local As StorageFolder = ApplicationData.Current.LocalFolder
				stFile = Await local.CreateFileAsync(filename, CreationCollisionOption.ReplaceExisting)
			End If
			If stFile IsNot Nothing Then
				Using zipStream As IRandomAccessStream = Await stFile.OpenAsync(FileAccessMode.ReadWrite)
					' Writes compressed data from memory to file.
					Using outstream As Stream = zipStream.AsStreamForWrite()
						outstream.SetLength(0)
						' Saves the stream as file.
						Dim buffer() As Byte = stream.ToArray()
						outstream.Write(buffer, 0, buffer.Length)
						outstream.Flush()
					End Using
				End Using
				' Create message dialog box.
				Dim msgDialog As New MessageDialog("Do you want to view the document?", "File has been created successfully")
				Dim yesCmd As New UICommand("Yes")
				msgDialog.Commands.Add(yesCmd)
				Dim noCmd As New UICommand("No")
				msgDialog.Commands.Add(noCmd)

				WinRT.Interop.InitializeWithWindow.Initialize(msgDialog, windowHandle)

				' Showing a dialog box.
				Dim cmd As IUICommand = Await msgDialog.ShowAsync()
				If cmd.Label = yesCmd.Label Then
					' Launch the saved file.
					Await Windows.System.Launcher.LaunchFileAsync(stFile)
				End If
			End If
		End Sub
	End Class
End Namespace

Build and run the MAUI application. A window will appear containing the interface shown below:

The UI of the MAUI App

Click on the "Generate PDF" button. After a few moments, a popup will appear to choose the location of the generated PDF file.

Select a location to save the PDF file

結論

IronPDF is one of the most commonly used PDF converter libraries that allows you to generate, read, edit, and format PDFs. The IronPDF library provides many benefits and functionalities, including a browser engine that will help to convert a given URL into a PDF file, allows you to add CSS to HTML strings and convert them to PDF files, and also allows you to fill out PDF forms. All of the features of IronPDF are included in one library.

IronPDF comes with various price structures. The basic price for IronPDF starts at $799. Product support and updates are also available for a one-year fee. Royalty-free redistribution coverage can also be purchased as an add-on.

To summarize, IronPDF is recommended since it offers great performance and a large number of features for developers working with PDFs. It supports universal platforms such as .NET MAUI. It also comes with excellent assistance and documentation, allowing you to fully utilize the wide range of the IronPDF library and its many features.