Debugging a WPF Application's Data Binding Issue with MVVM - Data Not Reflecting Changes
I've been banging my head against this for hours. Currently developing a WPF application using MVVM pattern for a client project, I've run into a frustrating data binding issue. The ViewModel seems to be updating correctly, but the changes aren’t reflecting in the UI. I followed the standard practices and implemented `INotifyPropertyChanged`, yet my UI does not update when properties change. The property in my ViewModel looks like this: ```csharp public class MyViewModel : INotifyPropertyChanged { private string myData; public string MyData { get => myData; set { if (myData != value) { myData = value; OnPropertyChanged(nameof(MyData)); } } } public event PropertyChangedEventHandler PropertyChanged; protected virtual void OnPropertyChanged(string propertyName) { PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName)); } } ``` In my XAML, I’ve correctly set the DataContext: ```xml <Window.DataContext> <local:MyViewModel /> </Window.DataContext> ``` To test if the binding is functioning at all, I tried using a simple string in the XAML: ```xml <TextBox Text="{Binding MyData, UpdateSourceTrigger=PropertyChanged}" /> ``` While debugging, I confirmed that the `OnPropertyChanged` method gets called upon setting `MyData`. However, the TextBox remains empty. I’ve also verified that there are no exceptions thrown in the output window during runtime. To troubleshoot further, I added a breakpoint in the `OnPropertyChanged` method to ensure it was hit, which it was. I even attempted a hard refresh of the window, but that didn’t solve the problem either. Additionally, I checked for any possible data context inheritance issues within nested controls, but everything looks correct. Is there something I might be missing regarding property binding in WPF, or any known quirks with the MVVM pattern that could be causing this? Any insights or debugging tips would be greatly appreciated! I'm working on a service that needs to handle this. Am I missing something obvious? Any help would be greatly appreciated!