context.Get() 和它的通用版本有什么区别?

What's the difference between context.Get() and its generic version?

我正在尝试熟悉 OWIN,但有很多事情让我感到困惑。例如,在部分 startup.cs class 中,我通过

注册上下文回调
app.CreatePerOwinContext(ApplicationDbContext.Create);
app.CreatePerOwinContext<ApplicationUserManager>(ApplicationUserManager.Create);

有什么区别?为什么我们需要那个泛型方法?

我可以这样获取上下文:

context.Get<ApplicationDbContext>())
context.GetUserManager<ApplicationUserManager>()

Get 和 GetUserManager 方法有什么区别?为什么我不能只为 ApplicationUserManager 调用 context.Get?

Get<UserManager>GetUserManager<UserManager>没有区别

这是两者的源代码...

    /// <summary>
    ///     Retrieves an object from the OwinContext using a key based on the AssemblyQualified type name
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="context"></param>
    /// <returns></returns>
    public static T Get<T>(this IOwinContext context)
    {
        if (context == null)
        {
            throw new ArgumentNullException("context");
        }
        return context.Get<T>(GetKey(typeof (T)));
    }

    /// <summary>
    ///     Get the user manager from the context
    /// </summary>
    /// <typeparam name="TManager"></typeparam>
    /// <param name="context"></param>
    /// <returns></returns>
    public static TManager GetUserManager<TManager>(this IOwinContext context)
    {
        if (context == null)
        {
            throw new ArgumentNullException("context");
        }
        return context.Get<TManager>();
    }