如何正确地MVC6注入的HttpContext [英] How properly inject HttpContext in MVC6

问题描述

在那些在HttpContext的请求我的API所需的信息数据我服务层，我读到这问题，他们说我应该用ActionContext中代替HttpContext.Current（停止在MVC6）。

第一种方式是通过重写此方法来设置控制器内部的数据：

 公共无效OnActionExecuting（ActionExecutingContext上下文）
{
    VAR的RouteData = context.RouteData;
    VAR的HttpContext = context.HttpContext;
    ...
}
 

或使用DI注入到服务层

 公共则将MyService（IContextAccessor＆LT;＆ActionContext的GT; contextAccessor）
{
    _httpContext = contextAccessor.Value.HttpContext;
    _routeData = contextAccessor.Value.RouteData;
}
 

但我不知道下面列出code的两个线是做DI正确的方法

  services.AddTransient＆LT; IContextAccessor＆LT;＆ActionContext的GT;，＆ContextAccessor ​​GT;（）;
services.AddTransient＆LT; IContextAccessor＆LT;＆ActionContext的GT;＆GT;（）;
 

我这样做时，我得到这个错误。

无法为类型解析服务Microsoft.AspNet.Mvc.ActionContext，而试图激活

更新
project.json Web项目

 DIMultiTenan.Infrastructure：，
DIMultiTenan.MongoImplementation：，
Microsoft.AspNet.Server.IIS：1.0.0-β3
Microsoft.AspNet.Mvc：6.0.0-β3，
Microsoft.AspNet.StaticFiles：1.0.0-β3
Microsoft.AspNet.Server.WebListener：1.0.0-β3
 

解决方案

如果您尝试访问的HttpContext ，那么你可以使用 IHttpContextAccessor ​​用于这一目的。

例如：

  services.AddTransient＆LT; QueryValueService＆GT;（）;
 

---

 公共类QueryValueService
{
    私人只读IHttpContextAccessor ​​_accessor;    公共QueryValueService（IHttpContextAccessor ​​httpContextAccessor）
    {
        _accessor ​​= httpContextAccessor;
    }    公共字符串的GetValue（）
    {
        返回_accessor.HttpContext.Request.Query [值];
    }
}
 

请注意，在上面的例子中 QueryValueService 只应注册为瞬态或作用域，而不是辛格尔顿为HttpContext的是每个请求的基础...

My data service layer in my API required information that are of the request in the httpcontext, I read this question and they said that I should used the ActionContext instead of HttpContext.Current (discontinue in MVC6).

The first way is to set the data inside the controller by overriding this method:

public void OnActionExecuting(ActionExecutingContext context)
{
    var routeData = context.RouteData;
    var httpContext = context.HttpContext;
    ...
}

Or using DI by injecting into the service layer

public MyService(IContextAccessor<ActionContext> contextAccessor)
{
    _httpContext = contextAccessor.Value.HttpContext;
    _routeData = contextAccessor.Value.RouteData;
}

but I'm not sure with of the both line of code listed below is correct way to do the DI

services.AddTransient<IContextAccessor<ActionContext>,ContextAccessor>();
services.AddTransient<IContextAccessor<ActionContext>>();

when I do this I get this error.

Unable to resolve service for type 'Microsoft.AspNet.Mvc.ActionContext' while attempting to activate

Update project.json web project

"DIMultiTenan.Infrastructure": "",
"DIMultiTenan.MongoImplementation": "", 
"Microsoft.AspNet.Server.IIS": "1.0.0-beta3",
"Microsoft.AspNet.Mvc": "6.0.0-beta3",
"Microsoft.AspNet.StaticFiles": "1.0.0-beta3",
"Microsoft.AspNet.Server.WebListener": "1.0.0-beta3"

解决方案

If you are trying to access HttpContext, then you can use IHttpContextAccessor for this purpose.

Example:

services.AddTransient<QueryValueService>();

---

public class QueryValueService
{
    private readonly IHttpContextAccessor _accessor;

    public QueryValueService(IHttpContextAccessor httpContextAccessor)
    {
        _accessor = httpContextAccessor;
    }

    public string GetValue()
    {
        return _accessor.HttpContext.Request.Query["value"];
    }
}

Note that in the above example QueryValueService should be registered only as Transient or Scoped and not Singleton as HttpContext is per-request based...

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