ReactiveWindow/ReactiveControl/etc non-nullable SafeViewModel property.

[HavenDV]

protected TViewModel SafeViewModel => ViewModel ?? throw new InvalidOperationException("ViewModel is null.");

This simplified usage of InvokeCommand:

// ViewModel produces a null reference warning and it needs to check.
InputTextBox
    .WhenKeyUp(Key.Enter)
    .InvokeCommand(SafeViewModel.Enter)
    .DisposeWith(disposable);

[glennawatson]

try

.InvokeCommand(this, x => x.SafeViewModel.Enter)

[HavenDV]

It also produces the warning.

[ushenkodmitry]

x => x.ViewModel!.Enter

[github-actions]

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