小编Sha*_*a-1的帖子

我正在使用基于 cookie 的身份验证制作 web 应用程序。我有登录屏幕，后端发送 cookie，然后浏览器随每个请求发送 cookie。

但是，当我尝试访问安全端点（有或没有 cookie）而不是“未经授权”或“正常”时，服务器返回“内部服务器错误”，但出现以下异常：

System.InvalidOperationException: No authenticationScheme was specified, and there was no DefaultChallengeScheme found. The default schemes can be set using either AddAuthentication(string defaultScheme) or AddAuthentication(Action<AuthenticationOptions> configureOptions).
   at Microsoft.AspNetCore.Authentication.AuthenticationService.ChallengeAsync(HttpContext context, String scheme, AuthenticationProperties properties)
   at Microsoft.AspNetCore.Authorization.Policy.AuthorizationMiddlewareResultHandler.HandleAsync(RequestDelegate next, HttpContext context, AuthorizationPolicy policy, PolicyAuthorizationResult authorizeResult)
   at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

我的 cookie 身份验证配置如下所示：

            builder.Services.ConfigureApplicationCookie(options =>
            {
                options.Cookie.Name = "Testcookie";
                options.Cookie.HttpOnly = true;
                options.Cookie.SecurePolicy = CookieSecurePolicy.Always;
                options.Cookie.SameSite = SameSiteMode.Lax;
                options.Cookie.Domain = "localhost";
                options.SlidingExpiration …

我想问一下这个简短的代码:

int i = 0;

有1个操作数还是2个？这i是一个操作数,但0也是？根据维基百科,0不应该(或者我可能误解).如果0不是操作数,它是常量还是什么？如果重要,则代码在C99中.