HttpContext.Current在ASP.NET Core中已经不存在了，但是有一个新的IHttpContextAccessor东西可以注入到您的依赖中并用来检索当前的HttpContext：
public class MyComponent : IMyComponent
{
private readonly IHttpContextAccessor _contextAccessor;
public MyComponent(IHttpContextAccessor contextAccessor)
{
_contextAccessor = contextAccessor;
}
public string GetDataFromSession()
{
return _contextAccessor.HttpContext.Session.GetString(*KEY*);
}
}
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