c# ASP.NET MVC全局变量



asp.net-mvc global-variables (5)

钢铁远远不热,但我把@ abatishchev的解决方案和这篇文章的答案结合起来得到了这个结果。 希望它有用:

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<SomeClass> SomeCollection
    {
        get { return GetVar("SomeCollection") as IEnumerable<SomeClass>; }
        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;
        }
    }
}

如何在ASP.NET MVC中声明全局变量?


Answer #1
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;
        }
    }
}

Answer #2

您还可以使用静态类,例如Config类或沿着这些行的某些东西......

public static class Config
{
    public static readonly string SomeValue = "blah";
}

Answer #3

对于非静态变量,我通过Application类字典将其排序如下:

在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);
        }
    }
}

在控制器中:

namespace MvcWebApplication.Controllers
{
    public class HomeController : Controller
    {
        //
        // GET: /Home/

        public ActionResult Index()
        {
            return View(HttpContext.Application["LicenseFile"] as string);
        }

    }
}

这样我们就可以在ASP.NET MVC中拥有全局变量:)

注意:如果您的对象不是字符串,只需写:

return View(HttpContext.Application["X"] as yourType);

Answer #4

您可以将它们放在应用程序中:

Application["GlobalVar"] = 1234;

它们仅在当前IIS / Virtual应用程序中是全局的。 这意味着,在webfarm上,它们是服务器的本地,并且位于作为应用程序根目录的虚拟目录中。





global-variables