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Xamarin Linker stipping out static class properties?


Xamarin Linker stipping out static class properties?

By : user2950453
Date : November 17 2020, 11:55 AM
I wish this helpful for you You can set a preserve attribute to your class: http://developer.xamarin.com/guides/ios/advanced_topics/linker/ See the section: Preserving Code
Example:
code :
[Preserve]
    public static class LinkerPreserve
    {
        static LinkerPreserve()
        {
            throw new Exception(typeof(SQLitePersistentBlobCache).FullName);
        }
    }

    public class PreserveAttribute : Attribute
    {
    }


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C++ Linker Error With Class static constexpr

C++ Linker Error With Class static constexpr


By : alowf
Date : March 29 2020, 07:55 AM
This might help you I don't think this is a bug. If you change the constexpr to const, it still fails, with the exact same error.
You've declared S::X, but not defined it anywhere, so there's no storage for it. If you do anything with it that needs to know the address of it then you'll need to define it somewhere also.
code :
int main() {
      int i = S::X; // fine
      foo<S::X>(); // fine
      const int *p = &S::X; // needs definition
      return std::min(S::X, 0); // needs it also
}
Static pointer to class linker error

Static pointer to class linker error


By : Mathieu Garoutte
Date : March 29 2020, 07:55 AM
this will help I've been busting my head for some time now trying to figure out a solution. I want to inherit from a class with a static pointer but I geterror LNK2001: unresolved external symbol "protected: static class cGame * cEvent::mGame" (?mGame@cEvent@@1PAVcGame@@A) , You need to define the static member outside the class:
code :
##include "game.h"

//do this .cpp file

cGame* cEvent::mGame = nullptr;

//or initialize it as : cGame* cEvent::mGame = create object!
Xamarin.iOS Linker removes members in class needed for reflection

Xamarin.iOS Linker removes members in class needed for reflection


By : Jinesh
Date : March 29 2020, 07:55 AM
it helps some times @SharpMobileCode gave a very good explanation but there are also two other ways to solve this.
Xamarin.Forms Dependency Service non-static fields/properties

Xamarin.Forms Dependency Service non-static fields/properties


By : mooncakefestival
Date : March 29 2020, 07:55 AM
With these it helps Not too understanding the title of your question.
If you use the singleton pattern, you can extract the properties based on the unique instantiation object when needed.Like this:
code :
public class Singleton
    {
        // Define a static variable to hold an instance of the class
        private static Singleton uniqueInstance;

        // Define a private constructor so that the outside world cannot create instances of the class
        private Singleton()
        {
        }

        /// <summary>
        /// Define public methods to provide a global access point, and you can also define public properties to provide global access points
        /// </summary>
        /// <returns></returns>
        public static Singleton GetInstance()
        {
            // Create if the instance of the class does not exist, otherwise return directly
            if (uniqueInstance == null)
            {
                uniqueInstance = new Singleton();
            }
            return uniqueInstance;
        }
    }
private void SaveConnectionData(JSON.Connection C)
                    {
                        App.Current.Properties[Cryptography.Encryption("AccessToken")] = Cryptography.Encryption(C.Access_token);
                        App.Current.Properties[Cryptography.Encryption("ExpiresIn")] = Cryptography.Encryption(C.Expires_in.ToString());
                        App.Current.Properties[Cryptography.Encryption("TokenType")] = Cryptography.Encryption(C.Token_type);
                        App.Current.Properties[Cryptography.Encryption("Scope")] = Cryptography.Encryption(JsonConvert.SerializeObject(C.Scope));
                        App.Current.Properties[Cryptography.Encryption("RefreshToken")] = Cryptography.Encryption(C.Refresh_token);
                        App.Current.SavePropertiesAsync();
                    }
why I get linker errors when trying to set static variable in a class?

why I get linker errors when trying to set static variable in a class?


By : Сергей Казаков
Date : March 29 2020, 07:55 AM
around this issue You need to define static member test_struct::number in a source code(.cpp), before using it:
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