程式小試身手

 最近在寫登入安全的網頁，以下紅字一直有錯誤點線，原來是少安裝:Microsoft.AspNet.WebApi.Owin

public Task<HttpResponseMessage> ExecuteAsync(CancellationToken cancellationToken)
        {
            Request.GetOwinContext().Authentication.Challenge(LoginProvider);

            HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.Unauthorized);
            response.RequestMessage = Request;
            return Task.FromResult(response);
        }

安裝完就好了