Unexpected NullReferenceException when accessing properties in a WPF MVVM application
I'm stuck trying to I keep running into I'm having trouble with I'm working with a `NullReferenceException` in my WPF application that follows the MVVM pattern... Specifically, the behavior is thrown when I try to bind a property in my view model to a UI element. I've ensured that the property is initialized, but for some reason, it seems to be null at runtime. Here’s a simplified version of my view model: ```csharp public class MainViewModel : INotifyPropertyChanged { private string _name; public string Name { get => _name; set { _name = value; OnPropertyChanged(nameof(Name)); } } public MainViewModel() { Name = "John Doe"; } public event PropertyChangedEventHandler PropertyChanged; protected virtual void OnPropertyChanged(string propertyName) { PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName)); } } ``` In my XAML code, I have: ```xml <Window x:Class="MyApp.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525"> <Grid> <TextBox Text="{Binding Name}" /> </Grid> </Window> ``` I've set the `DataContext` in the code-behind like this: ```csharp public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); DataContext = new MainViewModel(); } } ``` However, I still get `NullReferenceException` when the application runs. I've checked that `DataContext` is set correctly, and the property `Name` should not be null. I've even added breakpoints and debugged but need to find the root cause. Can anyone advise why this might be happening? Are there any common pitfalls in binding with WPF that I might be missing? Any help would be greatly appreciated! I'm working in a Ubuntu 22.04 environment. I'd be grateful for any help. I'm using C# 3.11 in this project. Has anyone dealt with something similar? I've been using C# for about a year now. Thanks in advance!