Скачать или смотреть Binding DataGridComboBoxColumn in WPF to a ComboBox Selected Item

Learn how to effectively bind a `DataGridComboBoxColumn` in WPF to a `ComboBox` Selected Item for better data filtering in your applications.
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This video is based on the question https://stackoverflow.com/q/68801763/ asked by the user 'Ole M' ( https://stackoverflow.com/u/14712545/ ) and on the answer https://stackoverflow.com/a/68817040/ provided by the user 'Ole M' ( https://stackoverflow.com/u/14712545/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Mastering Data Binding: DataGridComboBoxColumn in WPF

When developing applications in WPF, specifically under the MVVM (Model-View-ViewModel) pattern, data binding is key to dynamic user experiences. One common scenario is needing to filter data displayed in a DataGridComboBoxColumn based on the selection in a ComboBox. However, many developers find themselves lost at how to bind the ComboBox's SelectedItem to a DataGridComboBoxColumn (DGCBC). If you’re encountering similar issues, you’re not alone. Let’s break it down step by step.

The Challenge

In your WPF application, you have a ComboBox meant to influence available selections in a DataGridComboBoxColumn. After successfully filtering one ComboBox, transferring that logic to a DataGridComboBoxColumn may seem tricky. Typically, you may see placeholders instead of the expected populated values even if the ObservableCollection gets loaded correctly.

Your Existing Code

Here’s a simplified version of your current setup:

ComboBox Setup

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DataGrid and DGCBC

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

In this code, while the ComboBox is set up to bind properly, the DataGridComboBoxColumn fails to display the filtered results properly.

The Solution

The key was to set the ItemsSource of the DataGridComboBoxColumn using a Static Resource. This allows the binding to correctly reference the ObservableCollection that you have populated when a new item is selected in the ComboBox.

Step-by-Step Instructions

Define CollectionViewSource: Add a CollectionViewSource in your Window.Resources. This acts as a bridge to your ObservableCollection.

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

Update DataGridComboBoxColumn: Modify the ItemsSource binding in the DataGridComboBoxColumn to reference the created static resource.

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

Summary of Changes

Static Resource Creation: This allows for more effective data binding.

Correct Binding Reference: Ensures that the DataGridComboBoxColumn accesses the right collection and displays it properly.

Conclusion

By following these steps, you can efficiently bind a DataGridComboBoxColumn to the SelectedItem of a ComboBox. Leveraging CollectionViewSource as a static resource resolves the issue of blank placeholders, enhancing the data filtering process in your WPF applications. This technique not only improves functionality but also maintains the integrity of MVVM principles.

For anyone facing similar issues in binding ComboBox selections to DataGrid components, this solution is a solid reference point to ensure smooth operations and a delightful user interface. Happy coding!