如何在静态类中使用 IHttpContextAccessor 来设置 cookie [英] How to use IHttpContextAccessor in static class to set cookies

问题描述

我正在尝试在静态类中创建一个通用的 addReplaceCookie 方法.该方法看起来像这样

I am trying to create a generic addReplaceCookie method in a static class. The method would look something like this

public static void addReplaceCookie(string cookieName, string cookieValue)
{

    if ((HttpContext.Current.Request.Cookies(cookieName) == null))
    {
        // add cookie
        HttpCookie s = new HttpCookie(cookieName);
        s.Value = cookieValue;
        s.Expires = DateTime.Now.AddDays(7);
        HttpContext.Current.Response.Cookies.Add(s);
    }
    else {
        // ensure cookie value is correct 
        HttpCookie existingSchoolCookie = HttpContext.Current.Request.Cookies(cookieName);
        existingSchoolCookie.Expires = DateTime.Now.AddDays(7);
        existingSchoolCookie.Value = cookieValue;
        HttpContext.Current.Response.Cookies.Set(existingSchoolCookie);
    }

}

我知道为了在 asp.net 核心中获得 HttpContext，你必须使用 IHttpContextAccessor.但我无法将其注入静态类.

I know that in order to get the HttpContext in asp.net core you have to use the IHttpContextAccessor. But I cannot inject it into a static class.

还有其他方法可以访问它吗?

Is there another way to get access to it?

我正在使用 rc1-final.

I am using rc1-final.

推荐答案

虽然我建议远离像这样的静态类场景，但仍有可能实现您的要求.

While i would advise staying away from static class scenarios like this, it is still possible to achieve what you are asking for.

假设一个静态类像...

Assuming a static class like...

public class MyStaticHelperClass {
    private static IHttpContextAccessor httpContextAccessor;
    public static void SetHttpContextAccessor(IHttpContextAccessor  accessor) {
        httpContextAccessor = accessor;
    }

    public static void addReplaceCookie(string cookieName, string cookieValue) {
        var HttpContext = httpContextAccessor.HttpContext;
        if (HttpContext.Request.Cookies(cookieName) == null) {
            // add cookie
            HttpCookie s = new HttpCookie(cookieName);
            s.Value = cookieValue;
            s.Expires = DateTime.Now.AddDays(7);
            HttpContext.Response.Cookies.Add(s);
        } else {
            // ensure cookie value is correct 
            HttpCookie existingSchoolCookie = HttpContext.Request.Cookies(cookieName);
            existingSchoolCookie.Expires = DateTime.Now.AddDays(7);
            existingSchoolCookie.Value = cookieValue;
            HttpContext.Response.Cookies.Set(existingSchoolCookie);
        }
    }
}

您将在 Startup.ConfigureServices 中添加访问器，因为它不再自动添加

You would add the accessor in Startup.ConfigureServices since it is no longer added automatically

public void ConfigureServices(IServiceCollection service) {

    //Register IHttpContextAccessor and its implementation.
    services.AddHttpContextAccessor();

    services.AddTransient<IMyService, MyService>();
    services.AddMvc();

    //...
}

并通过注入Startup.Configure方法获取服务

And get the service via injection into the Startup.Configure method

public void Configure(IApplicationBuilder app, IHostingEnvironment env, IHttpContextAccessor accessor)
{
    MyStaticHelperClass.SetHttpContextAccessor(accessor);

    //...

}

现在完成了.我仍然强烈建议将您的静态类转换为服务，其具体实现将使用 IHttpContextAccessor 作为可以通过其构造函数注入的依赖项.

Now with that done. I would still strongly advise converting your static class into a service whose concrete implementation would use the IHttpContextAccessor as a dependency that can be injected via its constructor.

public interface ICookieService {
    void AddReplaceCookie(string cookieName, string cookieValue);
}

public class CookieService : ICookieService {
    IHttpContextAccessor httpContextAccessor;
    public CookieService(IHttpContextAccessor httpContextAccessor) {
        this.httpContextAccessor = httpContextAccessor;
    }
    public void AddReplaceCookie(string cookieName, string cookieValue) {
        var HttpContext = httpContextAccessor.HttpContext;
        if (HttpContext.Request.Cookies(cookieName) == null) {
            // add cookie
            HttpCookie s = new HttpCookie(cookieName);
            s.Value = cookieValue;
            s.Expires = DateTime.Now.AddDays(7);
            HttpContext.Response.Cookies.Add(s);
        } else {
            // ensure cookie value is correct 
            HttpCookie existingSchoolCookie = HttpContext.Request.Cookies(cookieName);
            existingSchoolCookie.Expires = DateTime.Now.AddDays(7);
            existingSchoolCookie.Value = cookieValue;
            HttpContext.Response.Cookies.Set(existingSchoolCookie);
        }
    }
}

...然后可以在服务集合中注册...

...that could then be registered with the Services collection...

public void ConfigureServices(IServiceCollection service) {

    services.AddHttpContextAccessor();

    services.AddTransient<ICookieService, CookieService>();
    services.AddMvc();
}

...并且可以注入到需要使用它的类中.

...and be available for injection into classes that have need of it's use.

public class SomeClassThatNeedCookieServicesController : Controller {
    ICookieService cookieService;

    public SomeClassThatNeedCookieServicesController(ICookieService cookieService) {
        this.cookieService = cookieService;
    }

    //...
}

这就是我在应用程序中管理会话 cookie 的方式.

This is how I do it to manage session cookies in my applications.

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