How to implement public dictionary?

Question

How to implement a public dictionary in ASP MVC NET 6 like:

Dictionary<string, string> My_dict1 = new Dictionary<string, string>();

that can be maintained (add/edit/delete) dictionary items from all classes?

Answer 1

Hi @winanjaya ,

How to implement public dictionary?

You can use the following methods:

1. Use a Static class:

   public static class GlobalData  
   {  
       public static Dictionary<string, string> Application { get; set; } = new Dictionary<string, string>();   
   }  
   

   Then, in the controller, use the following code to get or set the value:

       GlobalData.Application.Add("Name", "Tom");  
       var name = GlobalData.Application["Name"];  
   

2. Use Asp.net core Singleton pattern Create a class:

   public class ApplicationInstance  
   {   
       public Dictionary<string, object> Application { get; } = new Dictionary<string, object>();  
   }  
   

   Register the class using AddSingleton in the program.cs file:

   builder.Services.AddSingleton<ApplicationInstance>();  
   

   Then, refer the following code to use it:

   public class AccountController : Controller  
   {  
       private readonly ApplicationInstance _app;  
       public AccountController(ApplicationInstance application)  
       {  
           _app = application;  
       }  
       public IActionResult Index()  
       {  
           var name = GlobalData.Application["Name"];  
   
           var name2 = _app.Application["Name"];  
           return View();  
       }  
   }  
   

   The output as below:

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Best regards,
Dillion