HealthCareApp | Health Care Management System in Android | iOS library

Hello I got an error while doing login page. I just code Mainpage.xaml file other files are default and I picked "blank" when creating project. My error is:

" System.InvalidOperationException: "The class, property, or method you are attempting to use ("GradientBrush" is part of GradientBrush; to use it, you must opt-in by calling Forms.SetFlags("Brush_Experimental") before calling Forms.Init()."

I just write one file which is Mainpage.xaml. Does anybody help me how to handle my problem?

I have spring boot application. I am trying to save a simple Hospital details JSON request but when I check the on the server side the JSON is not mapped to VO object. It always comes as null.

Code: pom.xml

Scenario: I am using publishReplay to cache and replay certain Http requests within an Angular application (using publishReplay over shareReplay due to some bugs that have since been fixed in rxjs).

My problem is that I want to force the cached observable source to update itself and create a new cached observable with publishReplay if I detect a URL parameter change. I thought perhaps this could be accomplished by interrogating/comparing the newly proposed observable with the existing cached observable's source, but I have been unsuccessful in achieving this.

What I am looking for: A way to either interrogate an observable's source so I can compare it to the source of another observable to see if they are identical (url in this case), or some other means of detecting the url on an Http Observable changed with publishReplay. Furthermore I am attempting to abstract this logic away into a caching mechanism so I don't have to sprinkle code throughout the apps that detects if the parameter changes.

Here is a very naive example of what I'd like to do that isn't working, the input source parameter is the new Observable which contains a handle to an http request, and the origSource is the previous observable which contains the same (though potentially with a different url parameter that publishReplay doesn't seem to acknowledge).