Pass a value globally-CodePudding

Im new to xamarin/c#, im trying to make an application with login , and Im trying to pass the logged in userid inside the application, the question is , how do I pass or make the user id keeps floating inside after the login page? Should I keep passing it in every page using queryproperty or there's better way to keep it , like a specific file to to put it so that every page can call it?

CodePudding user response：

You can use the Application.Properties collection to store things that need to be accessible to the entire application.

To store the user ID you would use

Application.Current.Properties("UserID") = UserID;

and to retrieve it you would use

UserID = Application.Current.Properties("UserID");

CodePudding user response：

In C# it's not possible to define true global variables (meaning that they don't belong to any class). using a static class is a valid alternative option so you can create something like this:

public static class Globals
{
    public Dictionary<int, UserObject> Users = new Dictionary<int, UserObject>();
}

Now, you'll be able to access The Users's dictionary property and add/remove/modify login users

Following Hans Keﬆing comment, Please note that An Xamarin app servers a single user at at time, so you can refactor the above from a dictionary to UserObject

CodePudding user response：

Static classes - bad practic for contains info. You can use IoC-container. I don't know xamarin, if you have startup-class (how WPF), you can make ioc-container:

Install Autofac Install-Package Autofac -Version 5.0.0
Rigster user content:

class StartupClass
{
   public static IContainer Container { get; set; }

   public void OnStartup()
   {
      var containerBuilder = new ContainerBuilder();
      var userContent = smthMethodForGiveUserContent();
      containerBuilder.RegisterInstance<User>(userContent); //register UserType!
      Container = containerBuilder.Build();
   }
}

Resolve user content:

class SmthClass
{
   public void Method()
   {
      using(var scope = StartupClass.Container.BeginLifetimeScope())
      {
          var userContent = scope.Resolve<User>(); //IT'S YOUR OBJECT, USE!!
          //smth code..
      }
   }

}