如何从ASP.NET中的任何类访问会话变量？

问题描述：

我在我的应用程序中创建的APP_ code文件夹中的类文件。我有一个会话变量

I have created a class file in the App_Code folder in my application. I have a session variable

Session["loginId"]

我要访问在我的课本次会议的变量，但是当我写了下面这行，然后提示错误

I want to access this session variables in my class, but when I am writing the following line then it gives error

Session["loginId"]

谁能告诉我怎么这在APP_ code文件夹中创建ASP.NET 2.0中的一类内访问会话变量（C＃）

Can anyone tell me how to access session variables within a class which is created in app_code folder in ASP.NET 2.0 (C#)

答

（更新完整性）结果
您可以从任何页面访问会话变量或使用控制会话[登录ID] 并从任何类（例如，从一个类库中），使用 System.Web.HttpContext.Current.Session [登录ID。

(Updated for completeness)
You can access session variables from any page or control using Session["loginId"] and from any class (e.g. from inside a class library), using System.Web.HttpContext.Current.Session["loginId"].

但请阅读我原来的答复...

But please read on for my original answer...

我总是使用包装类围绕ASP.NET会话来简化访问会话变量：

I always use a wrapper class around the ASP.NET session to simplify access to session variables:

public class MySession
{
    // private constructor
    private MySession()
    {
      Property1 = "default value";
    }

    // Gets the current session.
    public static MySession Current
    {
      get
      {
        MySession session =
          (MySession)HttpContext.Current.Session["__MySession__"];
        if (session == null)
        {
          session = new MySession();
          HttpContext.Current.Session["__MySession__"] = session;
        }
        return session;
      }
    }

    // **** add your session properties here, e.g like this:
    public string Property1 { get; set; }
    public DateTime MyDate { get; set; }
    public int LoginId { get; set; }
}

在ASP.NET会话本身这个类存储一个实例，并允许您从任何类，例如像这样的访问类型安全方式的会话属性：

This class stores one instance of itself in the ASP.NET session and allows you to access your session properties in a type-safe way from any class, e.g like this:

int loginId = MySession.Current.LoginId;

string property1 = MySession.Current.Property1;
MySession.Current.Property1 = newValue;

DateTime myDate = MySession.Current.MyDate;
MySession.Current.MyDate = DateTime.Now;

该方法有几个优点：

这样可以节省你很多的类型转换

您不必在你的应用程序中使用硬codeD会话密钥（如会话[登录ID]

您可以通过MySession的的属性

您可以初始化使用默认值的会话变量（例如保证它们不为空）

it saves you from a lot of type-casting
you don't have to use hard-coded session keys throughout your application (e.g. Session["loginId"]
you can document your session items by adding XML doc comments on the properties of MySession
you can initialize your session variables with default values (e.g. assuring they are not null)

如何从ASP.NET中的任何类访问会话变量？

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