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XAMARIN QUESTIONS

System.InvalidCastException: Specified cast is not valid in xamarin forms?
System.InvalidCastException: Specified cast is not valid in xamarin forms?
it fixes the issue I am working on Xamarin.Forms I got error , I resolved the error by changing the code into following
TAG : xamarin
Date : October 14 2020, 12:00 AM , By : henri sula
How to properly set height on GRID?
How to properly set height on GRID?
wish help you to fix your issue Remove the StackLayout outside of your content Grid. The Grid won't take the whole space of the StackLayout so that it looks the percentage is wrong:
TAG : xamarin
Date : October 12 2020, 07:00 AM , By : hellojuny
Properly implement In-App Updates in App Center?
Properly implement In-App Updates in App Center?
Hope this helps Looking at this App Center documentation here for Xamarin Forms -You can customize the default update dialog's appearance by implementing the ReleaseAvailable callback. You need to register the callback before calling AppCenter.Start
TAG : xamarin
Date : October 12 2020, 05:00 AM , By : Anna Maus
Can you use Xamarin.Forms 4.0 with Shell and Prism framework
Can you use Xamarin.Forms 4.0 with Shell and Prism framework
fixed the issue. Will look into that further The short answer is sort of and it depends on what from Prism you want to use. You can of course use the ViewModelLocator to inject your ViewModels, but you really don't have a way passing parameters to in
TAG : xamarin
Date : October 10 2020, 01:00 AM , By : Xinyi Jiang
How to handle NULL reference exception in c#?
How to handle NULL reference exception in c#?
I wish this helpful for you Handle a Null Reference Exception.A NullReferenceException happens when you try to access a reference variable that isn’t referencing any object. If a reference variable isn’t referencing an object, then it’ll be treated a
TAG : xamarin
Date : October 09 2020, 11:00 PM , By : Patrick Barnard
Xamarin Forms android app taking 12 seconds to startup
Xamarin Forms android app taking 12 seconds to startup
To fix the issue you can do The painful truth is that you will never be able to optimize it to the level that it starts in 2-3 seconds with Xamarin.Forms, at least within the current implementation. You can find some of the tips how to speed it up: I
TAG : xamarin
Date : October 09 2020, 11:00 PM , By : MarkTheMule
Visual Studio for Mac creates 2 .apk archives, one with -signed.apk
Visual Studio for Mac creates 2 .apk archives, one with -signed.apk
will be helpful for those in need The major differences are the debug flag and the signing keys, I guess. You can read more about signing here and manually signing here.
TAG : xamarin
Date : October 09 2020, 04:00 PM , By : Anil Sangani
When Cancel button in "MobileBarCodeScanner()" is clicked, Application Exits and Crashes!(Xamarin.iOS)
When Cancel button in "MobileBarCodeScanner()" is clicked, Application Exits and Crashes!(Xamarin.iOS)
This might help you Most likely it's because you have a Null Reference Exception. You are checking for result.Text to be null. But when the user presses Cancel, result equals null and so it can't reach the Text property.So just place a null check for
TAG : xamarin
Date : October 09 2020, 09:00 AM , By : Vasya Shevchenko
How do your write Xamarin platform specific code in a .net standard library?
How do your write Xamarin platform specific code in a .net standard library?
will be helpful for those in need You should not include platform specific code or use namespaces like the one you mentioned in your .NET Standard Library, the reason is that .NET is just a runtime environment. It’s not the the main runtime environme
TAG : xamarin
Date : October 09 2020, 03:00 AM , By : John Does
How to use HotReload feature in Xamarin.Forms UWP project
How to use HotReload feature in Xamarin.Forms UWP project
To fix this issue I'm adding this answer in the hope that it saves someone else some time wondering why it isn't working for them.The short answer to the question originally asked is that, right now
TAG : xamarin
Date : October 05 2020, 09:00 AM , By : Ken Lowry
Create a new Mobile.App (Xamarin.Forms) project, try to compile, but "Failed linking references"
Create a new Mobile.App (Xamarin.Forms) project, try to compile, but "Failed linking references"
hope this fix your issue For whatever reason it can lock itself in this state.Deleting *\bin *\obj solves the issue.
TAG : xamarin
Date : October 04 2020, 08:00 PM , By : ALIREZA POURSHABAN
Can't access XAML elements after calling InitializeComponent on BasePage class
Can't access XAML elements after calling InitializeComponent on BasePage class
fixed the issue. Will look into that further By default, the variables that Xamarin generates from your XAML are private, so you can't access them in inherited classes.Field Modifers allow you change that default behavior
TAG : xamarin
Date : October 04 2020, 11:00 AM , By : Julian Silver
Cannot find "cross-platform using PCL" while creating a xamarin app
Cannot find "cross-platform using PCL" while creating a xamarin app
I hope this helps you . The PCL option is deprecated .From the official documentation:
TAG : xamarin
Date : October 03 2020, 06:00 PM , By : Sam Stone
Prism OnNavigatingTo no longer fires
Prism OnNavigatingTo no longer fires
this will help Short answer: yes. There were some breaking changes regarding Navigation in the latest Prim Release:
TAG : xamarin
Date : October 03 2020, 03:00 PM , By : Shubham Singh Kushwa
What is the difference between WKNavigationDelegate and WKUIDelegate
What is the difference between WKNavigationDelegate and WKUIDelegate
fixed the issue. Will look into that further WKNavigationDelegate : It helps you implement custom behaviors that are triggered during a web view's process of accepting, loading, and completing a navigation request.And the WKUIDelegate class provides
TAG : xamarin
Date : October 03 2020, 02:00 PM , By : Renairy
Shell.Current.Navigation.PopAsync() fires OnAppearing for iOS but not Android when it goes back a page
Shell.Current.Navigation.PopAsync() fires OnAppearing for iOS but not Android when it goes back a page
Any of those help I am using the following command to open a new page: , I don't think they implemented shell lifecycle until XF 4.2
TAG : xamarin
Date : October 03 2020, 01:00 PM , By : Vivek Singh
How we know finger print is changed or new fingerprint is added
How we know finger print is changed or new fingerprint is added
Any of those help AFAIK CrossFingerprint does not have such functionality, but you can implement it by yourself.For your Android project read about KeyPermanentlyInvalidatedException.
TAG : xamarin
Date : October 03 2020, 09:00 AM , By : dozy_boy
Enable and disable Xamarin Forms Switch by MVVM
Enable and disable Xamarin Forms Switch by MVVM
I think the issue was by ths following , I created a quick sample using what I could understand from your request.The SelectAll will Toggle-True all the 4 options but the user will not be able to Toggle-False the SelectAll Switch.
TAG : xamarin
Date : October 03 2020, 06:00 AM , By : Nathan
SanFrancisco (.SFUIText, .SFUI-Regular) fonts issue on iOS 13
SanFrancisco (.SFUIText, .SFUI-Regular) fonts issue on iOS 13
This might help you System fonts like this are now longer reference-able with 'dot' / . notation as per:https://developer.apple.com/videos/play/wwdc2019/227/
TAG : xamarin
Date : October 01 2020, 07:00 PM , By : Nintenic
Remove underline from Entry Control in Xamarin Forms
Remove underline from Entry Control in Xamarin Forms
I hope this helps . I am new to Xamarin-Forms and developing a login form and using Material Design (IVisual). I have created a custom Entry class and inherited it with MaterialEntryRenderer to customize it. Thing i want to achieve is to remove under
TAG : xamarin
Date : October 01 2020, 02:00 PM , By : faceVoid
ImageCell not displaying image only on Android
ImageCell not displaying image only on Android
I hope this helps you . Your issue is related with the restrictions on later Android versions with non secure (http) connections.If you debug the app and look at the Output you will see a message like this:
TAG : xamarin
Date : September 30 2020, 09:00 PM , By : inso
Run NUnit tests in Appcenter?
Run NUnit tests in Appcenter?
Does that help The easiest way I found to have AppCenter run a project's NUnit tests was by adding a post-build script for each app and install NunitXml.TestLogger Nuget package into your NUnit project, which will output an Xml file of your test resu
TAG : xamarin
Date : September 29 2020, 06:00 AM , By : akshayghanekar83
Xamarin Forms Lottie image not displaying
Xamarin Forms Lottie image not displaying
it helps some times I have found solution here: https://iinteractive.com/notebook/2017/05/31/lottie-xamarin.html . At start install "Com.Airbnb.Xamarin.Forms.Lottie" in all 3 projects. Then install another library: "Com.Airbnb.Android.Lottie" separat
TAG : xamarin
Date : September 24 2020, 01:00 PM , By : Энфилд ИНФО
What are the "Requires full screen" and "Supports multiple windows" options in Info.plist for a Xama
What are the "Requires full screen" and "Supports multiple windows" options in Info.plist for a Xama
will be helpful for those in need Requires Full screen and Supports Multiple WindowsIOS 9+ supports resizable apps with multi-window support. Unless you are re-writing your app to support multi-window, you will be requiring 'Full screen'. This is a h
TAG : xamarin
Date : September 24 2020, 11:00 AM , By : Tamás Borbély
Has anyone been able to see a crash attachment with Xamarin Forms and AppCenter.ms?
Has anyone been able to see a crash attachment with Xamarin Forms and AppCenter.ms?
this one helps. We can use AppCenter only after it has been started which according to official documentation on iOS we do it in AppDelegate class in the method FinishedLaunching. But the point is the class Application in Main.cs file is called befor
TAG : xamarin
Date : September 23 2020, 10:00 PM , By : agoes
Are there any alternatives to the luberda-molinet/FFImageLoading code for svg image loading in XF
Are there any alternatives to the luberda-molinet/FFImageLoading code for svg image loading in XF
help you fix your problem You can create an image from a SVG file in runtime, using SkiaSharp.
TAG : xamarin
Date : September 20 2020, 03:00 PM , By : lakecity
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