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Hi!

I have a problem with my property when I try to put a static resource value inside it, the method "OnPropertyChanged" is never called.
Here is my script:

using Xamarin.Forms;
using Xamarin.Forms.Xaml;

namespace Templates
{
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class CircleButton : Button
    {
        public static BindableProperty SizeProperty = BindableProperty.Create
        (
            propertyName: nameof(Size),
            returnType: typeof(double),
            declaringType: typeof(CircleButton),
            defaultValue: 50d,
            defaultBindingMode: BindingMode.Default
        );

        public double Size
        {
            get => (double)GetValue(SizeProperty);
            set => SetValue(SizeProperty, value);
        }

        public CircleButton()
        {
            InitializeComponent();
        }

        protected override void OnPropertyChanged(string propertyName = null)
        {
            base.OnPropertyChanged(propertyName);

            switch (propertyName)
            {
                case nameof(Size):
                    CornerRadius = (int)Size / 2;
                    WidthRequest = Size;
                    HeightRequest = WidthRequest;
                    break;
            }
        }
    }
}

In XAML when I use my template:

<!--This work-->
<appTemplate:CircleButton Size="90"/>
<!--This work-->
<appTemplate:CircleButton Size="{Binding Size}"/>
<!--This does not work-->
<appTemplate:CircleButton Size="{StaticResource SmallButtonSize}"/>

Is there a solution to call a method when a value is setted with a Static Resource?

Hi,
I'm using Portable-WebDAV-Library [1] the create a web request using NTLM in Xamarin.iOS and Xamarin.Android.
Doing this leads for some requests to the exception:

System.Net.Http.HttpRequestException: An error occurred while sending the request ---> System.Net.WebException: Should never happen. ---> System.InvalidOperationException: Should never happen.
at System.Net.WebOperation.SetPriorityRequest (System.Net.WebOperation operation) [0x00025] in /Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/external/mono/mcs/class/System/System.Net/WebOperation.cs:226
at System.Net.HttpWebRequest.HandleNtlmAuth (System.Net.WebResponseStream stream, System.Net.HttpWebResponse response, System.Net.BufferOffsetSize writeBuffer, System.Threading.CancellationToken cancellationToken) [0x0005d] in /Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/external/mono/mcs/class/System/System.Net/HttpWebRequest.cs:1476

The code is working fine in a Windows App, so the problem is probably in mono. There is already an issue which is maybe related [2]
Looking in the mono repo the issue is located here [3]:

    public void SetPriorityRequest (WebOperation operation)
    {
        lock (this) {
            if (requestSent != 1 || ServicePoint == null || finished != 0)
                throw new InvalidOperationException ("Should never happen.");
            if (Interlocked.CompareExchange (ref priorityRequest, operation, null) != null)
                throw new InvalidOperationException ("Invalid nested request.");
        }
    }

To reproduce the error install nuget package Portable-WebDAV-Library and use this code:

    private CredentialCache GetCredentialCache(string username, string password)
    {
        return new CredentialCache
        {
            { new Uri(Common.Common.WEBDAV_URI), Common.Common.AUTHENTICATION_SCHEME, new NetworkCredential(username, password) },
        };
    }

    public async Task<bool> PathExistsAsync(string username, string password, string path)
    {
        var webDavSession = new WebDavSession(Common.Common.WEBDAV_URI, GetCredentialCache(username, password), new Version(1, 1));
        webDavSession.Timeout = new System.TimeSpan(0, 0, 30);

        return await webDavSession.ExistsAsync(path).ConfigureAwait(false);
    }

Currently I'm out of ideas, not sure what to do to fix the issue ...

[1] github.com/mono/mono/blob/c5b88ec4f323f2bdb7c7d0a595ece28dae66579c/mcs/class/System/System.Net/WebOperation.cs
[2] github.com/mono/mono/issues/15796]
[3] github.com/mono/mono/blob/c5b88ec4f323f2bdb7c7d0a595ece28dae66579c/mcs/class/System/System.Net/WebOperation.cs

Example: 1) I have a native iOS app project.

2) Then I created a seperate ios lib project using visual studio for mac to make native ios framework.(using embeddinator 4000)

In this project i have added a page and text field using xamarin.form.

3)Then I used above framework created in native iOS PROJECT.

4) i can send data from my native app to framework(xamrin.form text field is populated).

5) from native app i can push xamarin.form page on native view using navigation controller.

6) i have also a navigation bar back button at top of xamarin.form page so that i can come back to native.

Requirement: How to send data back to native from xamarin.form ?

How to send data from textfield of xamarin.form view to native when i press back button of navigation bar?

If using delegation how is that possible?

This code works for iOS and Android, and for UWP in Debug mode. But UWP release gives an exception here:

    private void SetupSimpleNav()
    {
        Page page = FreshPageModelResolver.ResolvePageModel<MenuPageModel>();

The message is:
Resolve failed: MenuPage - Reason: Operation is not supported on this platform.

Please advise.

When i run this app in iOS 13 I get a black screen immediately after the launch screen.
With iOS 12.2 annd earlier everything works.

This is my AppDelegate.cs:

public override bool FinishedLaunching(UIApplication app, NSDictionary options)
        {
            global::Xamarin.Forms.Forms.Init();

            App.StatusBarHeight = (int)UIApplication.SharedApplication.StatusBarFrame.Height;

            FFImageLoading.Forms.Platform.CachedImageRenderer.Init();

            // Syncfusion components
            Syncfusion.SfNumericUpDown.XForms.iOS.SfNumericUpDownRenderer.Init();
            Syncfusion.XForms.iOS.Border.SfBorderRenderer.Init();
            Syncfusion.XForms.iOS.Buttons.SfButtonRenderer.Init();
            Syncfusion.SfChart.XForms.iOS.Renderers.SfChartRenderer.Init();

            LoadApplication(new App(new iOSInitializer()));

            return base.FinishedLaunching(app, options);
        }

Then my App.xaml.cs looks like this:

    protected override async void OnInitialized()
            {
                InitializeComponent();

                await NavigationService.NavigateAsync("Navigation/DebugPage");
            }

For now i am just redirecting to a blank page with a label in it, so there are no controls or anything.
It's just all black (no status bar either).

Thanks for any help!

We are experiencing some issue when run the win10 UWP application compiled in release mode.
In the release mode, It throws target invocation exception at run time. If we compile it in debug mode it works fine.

If we deselect the “Compile with .NET Native tool chain” option (it is selected by default) it seems to be working ok. but according to the Microsoft documentation, this option would generate native code that would improve the application startup speed and performance.

Can someone provide some help in resolving this issue?