[Public] Troubleshooting: Print() method Hangs Using IronPrint

If you're using IronPrint in a WPF or WinForm application and notice that the Print() method gets stuck (hangs indefinitely), this guide will help you understand the issue and apply a reliable workaround.

Issue Description

When calling the synchronous Print() method in a WPF application, the method is invoked but never completes execution. This behavior effectively hangs the UI or blocks the thread indefinitely.

This happens even when the print job should be valid and processed correctly.

Affected code

var printer = new IronPrint.Printer();
printer.Print("Test print"); // Hangs here

This is the expected behaviour when using IronPrint in a WinForm or WPF application due to Threading or Dispatcher context in WPF conflicting with IronPrint's print pipeline

• Print() method runs in UI-thread of the applications that blocks the method.

Solution

Use the asynchronous version of the API:

var printer = new IronPrint.Printer();
await printer.PrintAsync("Test print");

This:

• Avoids thread blocking

• Works reliably in WPF and WinForm application

• Ensures the printing operation completes and the UI remains responsive

Best Practices for WPF/WinFrom + Printing

• Use latest version of IronPrint to apply for the fix if possible

• Prefer async APIs (e.g. PrintAsync) in WPF and WinForm to avoid UI thread deadlocks

• Avoid blocking calls (.Result, .Wait()) on the main thread

• Always handle long-running or external I/O (like printing) on background or async tasks