Скачать или смотреть How to Pass Data Between Windows in WPF Applications

Learn how to effectively transfer user input data from one window to another in WPF applications using C# .
---
This video is based on the question https://stackoverflow.com/q/62861758/ asked by the user 'Rookie' ( https://stackoverflow.com/u/13185065/ ) and on the answer https://stackoverflow.com/a/62862055/ provided by the user 'neelesh bodgal' ( https://stackoverflow.com/u/10024696/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Shifting info when window open

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Pass Data Between Windows in WPF Applications

When developing a WPF (Windows Presentation Foundation) application, you might encounter scenarios where you need to transfer data between multiple windows. One common situation is when you want to pass user inputs from one window (like a main menu) to another window that serves as a detail view or confirmation screen. In this post, we'll address a common issue where data from the main window is not updating correctly in the new window. We'll provide a straightforward solution to ensure that user choices made in the main window are correctly utilized in the new window.

The Problem

You have defined a class named Food that represents a food item with properties such as Name, Description, and Price. In your main window, users can select a food item and provide additional information. However, when a new window opens upon clicking a button, the new window does not reflect the users' current choices; instead, it retrieves the information as it was when the application started.

Example Code

Here's the partial code for the Food class and the MainWindow and NewWindow classes:

[[See Video to Reveal this Text or Code Snippet]]

In the NewWindow class, the values are pulled from the MainWindow constructor, leading to outdated data.

The Solution

To resolve this issue, you need to pass the selected data directly to the NewWindow when you instantiate it. Here’s how you can do that:

Step-by-Step Guide

Create New Instance of Food: Get the current values directly from the controls before the new window is shown.

Pass Food Object: Instead of instantiating NewWindow without parameters, pass the newly created Food object to its constructor.

Updated Code Example

Here’s the corrected implementation:

MainWindow Class

[[See Video to Reveal this Text or Code Snippet]]

NewWindow Class

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By following the simple steps outlined above, you can effectively transfer user-selected data from your main window to any other window in your WPF application. Ensuring that the NewWindow receives an updated Food object directly resolves the problem of outdated information being displayed.

This method enhances user experience by reflecting their choices accurately in the subsequent windows. Implementing this practice in your WPF applications will help you create more dynamic and responsive user interfaces.

Now that you understand how to pass data effectively between windows, go ahead and implement this in your WPF projects!