Xamarin - Binding a DateTime gives "InvalidProgramException - Invalid IL Code"

[vsfeedback]

This issue has been moved from a ticket on Developer Community.

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This is my code:

MyChildControl.cs

public class MyChildControl : NControlView
{
    public DateTime MyDateTime { get; set; }
}

MyParentControlModel.cs

public class MyParentControlModel : INotifyPropertyChanged
{
    private DateTime _myDateTime;
    public DateTime MyDateTime
    {
        get => _myDateTime;
        set
        {
            _myDateTime= value;
            OnPropertyChanged();
        }
    }
    ....
}

MyParentControl.xaml

...
<myNamespace:MyChildControl MyDateTime="{Binding MyDateTime}"/>
...

Doing this results in an InvalidProgramException "Invalid IL Code". Removing the binding makes the issue disappear

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Original Comments

Visual Studio Feedback System on 6/15/2020, 00:34 AM:

We have directed your feedback to the appropriate engineering team for further evaluation. The team will review the feedback and notify you about the next steps.

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Original Solutions

(no solutions)

[samhouts]

The problem seems to be that the Xaml parser is getting confused when the property is a DateTime and is attempting to compile something to IL instead of throwing the expected exception that MyDateTime is not a BindableProperty. If you change MyDateTime to be a string instead of a DateTime, you get the proper compile exception.

Repro without NControl:
FT1141376.zip

[StephaneDelcroix]

the Xaml compiler is confused because DateTime supports Add() 🤦