ASP NET MVC Global Variables

Question

How do you declare global variables in ASP NET MVC

User · Answer

You could also use a static class  such as a Config class or something along those lines     public static class Config       public static readonly string SomeValue    blah

User · Answer

The steel is far from hot  but I combined  abatishchev s solution with the answer from this post and got to this result  Hope it s useful   public static class GlobalVars       private const string GlobalKey    AllMyVars        static GlobalVars                 Hashtable table   HttpContext Current Application GlobalKey  as Hashtable           if  table    null                        table   new Hashtable                HttpContext Current Application GlobalKey    table                       public static Hashtable Vars               get   return HttpContext Current Application GlobalKey  as Hashtable               public static IEnumerable lt SomeClass gt  SomeCollection               get   return GetVar  SomeCollection   as IEnumerable lt SomeClass gt             set   WriteVar  SomeCollection   value                internal static DateTime SomeDate               get   return  DateTime GetVar  SomeDate              set   WriteVar  SomeDate   value                private static object GetVar string varName                if  Vars ContainsKey varName                         return Vars varName                      return null             private static void WriteVar string varName  object value                if  value    null                        if  Vars ContainsKey varName                                 Vars Remove varName                             return                     if  Vars varName     null                        Vars Add varName  value                     else                       Vars varName    value

User · Answer

For non-static variables  I sorted it out via Application class dictionary as below   At Global asax ac   namespace MvcWebApplication            Note  For instructions on enabling IIS6 or IIS7 classic mode          visit http   go microsoft com  LinkId 9394801       public class MvcApplication   System Web HttpApplication                 private string  licensefile     the global private variable          internal string LicenseFile    the global controlled variable                        get                                 if  String IsNullOrEmpty  licensefile                                           string tempMylFile   Path Combine Path GetDirectoryName Assembly GetAssembly typeof LDLL License   Location    License l                         if   File Exists tempMylFile                            File Copy Server MapPath    Content license License l                                 tempMylFile                               true                         licensefile   tempMylFile                                      return  licensefile                                    protected void Application Start                         Application  LicenseFile     LicenseFile    the global variable s bed              AreaRegistration RegisterAllAreas                 RegisterGlobalFilters GlobalFilters Filters               RegisterRoutes RouteTable Routes                       And in Controller   namespace MvcWebApplication Controllers       public class HomeController   Controller                             GET   Home           public ActionResult Index                         return View HttpContext Application  LicenseFile   as string                        In this way we can have global variables in ASP NET MVC     NOTE  If your object is not string simply write   return View HttpContext Application  X   as yourType

User · Answer

public static class GlobalVariables          readonly variable     public static string Foo               get                       return  foo                           read-write variable     public static string Bar               get                       return HttpContext Current Application  Bar   as string                    set                       HttpContext Current Application  Bar     value

User · Answer

You can put them in the Application   Application  GlobalVar     1234    They are only global within the current IIS   Virtual applicition  This means  on a webfarm they are local to the server  and within the virtual directory that is the root of the application

User · Answer

Technically any static variable or Property on a class  anywhere in your project  will be a Global variable e g   public static class MyGlobalVariables       public static string MyGlobalString   get  set        But as  SLaks says  they can  potentially  be bad practice and dangerous  if not handled correctly  For instance  in that above example  you would have multiple requests  threads  trying to access the same Property  which could be an issue if it was a complex type or a collection  you would have to implement some form of locking

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