xaml-csharp-development-skill-for-avalonia

WPF Printing, DocumentPaginator, and Export/Preview Workflows to Avalonia

Table of Contents

  1. Scope and APIs
  2. Printing Mapping
  3. Conversion Example
  4. Avalonia C# Equivalent
  5. Troubleshooting

Scope and APIs

Primary WPF APIs:

Primary Avalonia patterns:

Printing Mapping

WPF Avalonia
PrintDialog.PrintDocument(...) explicit export service + preview/launch flow
DocumentPaginator print paging report pagination in app services/view-models
sync print flow async export and user-driven open/print steps

Avalonia core does not provide direct equivalents for WPF printing APIs.

Conversion Example

WPF C#:

var dialog = new PrintDialog();
if (dialog.ShowDialog() == true)
    dialog.PrintDocument(((IDocumentPaginatorSource)document).DocumentPaginator, "Report");

Avalonia XAML:

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:vm="using:MyApp.ViewModels"
             x:DataType="vm:ReportViewModel">
  <StackPanel Spacing="8">
    <Button Content="Preview Report"
            Command="{CompiledBinding PreviewReportCommand}" />
    <Button Content="Export Report"
            Command="{CompiledBinding ExportReportCommand}" />
  </StackPanel>
</UserControl>

Avalonia C# Equivalent

using System.IO;
using System.Threading.Tasks;
using Avalonia.Controls;
using Avalonia.Platform.Storage;

public static async Task ExportReportAsync(TopLevel topLevel, string reportText)
{
    var file = await topLevel.StorageProvider.SaveFilePickerAsync(new FilePickerSaveOptions
    {
        Title = "Export Report",
        SuggestedFileName = "report.txt",
        FileTypeChoices = new[]
        {
            new FilePickerFileType("Text") { Patterns = new[] { "*.txt" } }
        }
    });

    if (file is null)
        return;

    await using var stream = await file.OpenWriteAsync();
    await using var writer = new StreamWriter(stream);
    await writer.WriteAsync(reportText);

    await topLevel.Launcher.LaunchFileAsync(file);
}

Troubleshooting

  1. Expecting direct WPF print API parity.
    • treat printing as an explicit subsystem (export + preview + optional package integration).
  2. Report generation blocks UI.
    • run heavy generation off the UI thread and marshal only UI updates.
  3. Export open/print behavior varies by OS.
    • validate launcher/file-association behavior per target platform.
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