在 ASP.NET 标识中更改用户的主键答案

【问题标题】：Change Primary Key for Users in ASP.NET Identity在 ASP.NET 标识中更改用户的主键
【发布时间】：2016-12-04 12:07:37
【问题描述】：

为了实现int主键我关注了这篇文章：https://www.asp.net/identity/overview/extensibility/change-primary-key-for-users-in-aspnet-identity

它可以编译，但在启动时它给我这个错误消息：

mscorlib.dll 中出现“System.FormatException”类型的异常，但未在用户代码中处理
附加信息：输入字符串的格式不正确。

代码：

    public void ConfigureAuth(IAppBuilder app)
    {
        // Configure the db context, user manager and signin manager to use a single instance per request
        app.CreatePerOwinContext(ApplicationDbContext.Create);
        app.CreatePerOwinContext<ApplicationUserManager>(ApplicationUserManager.Create);
        app.CreatePerOwinContext<ApplicationSignInManager>(ApplicationSignInManager.Create);

        // Enable the application to use a cookie to store information for the signed in user
        // and to use a cookie to temporarily store information about a user logging in with a third party login provider
        // Configure the sign in cookie
        app.UseCookieAuthentication(new CookieAuthenticationOptions
        {
            AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie,
            LoginPath = new PathString("/Account/Login"),
            Provider = new CookieAuthenticationProvider
            {
                OnValidateIdentity = SecurityStampValidator.OnValidateIdentity<ApplicationUserManager, ApplicationUser, int>(
                validateInterval: TimeSpan.FromMinutes(30),
                regenerateIdentityCallback: (manager, user) =>
                    user.GenerateUserIdentityAsync(manager),
================================================================================
                    getUserIdCallback: (id) => (id.GetUserId<int>()  <<===== THIS IS WHERE I GET THE ERROR MESSAGE))
================================================================================

            }
        });            
        app.UseExternalSignInCookie(DefaultAuthenticationTypes.ExternalCookie);

        // Enables the application to temporarily store user information when they are verifying the second factor in the two-factor authentication process.
        app.UseTwoFactorSignInCookie(DefaultAuthenticationTypes.TwoFactorCookie, TimeSpan.FromMinutes(5));

        // Enables the application to remember the second login verification factor such as phone or email.
        // Once you check this option, your second step of verification during the login process will be remembered on the device where you logged in from.
        // This is similar to the RememberMe option when you log in.
        app.UseTwoFactorRememberBrowserCookie(DefaultAuthenticationTypes.TwoFactorRememberBrowserCookie);

        // Uncomment the following lines to enable logging in with third party login providers
        //app.UseMicrosoftAccountAuthentication(
        //    clientId: "",
        //    clientSecret: "");

        //app.UseTwitterAuthentication(
        //   consumerKey: "",
        //   consumerSecret: "");

        //app.UseFacebookAuthentication(
        //   appId: "",
        //   appSecret: "");

        //app.UseGoogleAuthentication(new GoogleOAuth2AuthenticationOptions()
        //{
        //    ClientId = "",
        //    ClientSecret = ""
        //});
    }

有谁知道问题出在哪里？

【问题讨论】：

Input string was not in a correct format 表示从 id 传递的字符串值可能不是有效数字。您可以使用 getUserIdCallback: (id) => (int.Parse(id.GetUserId())) 将其解析为表 PK 的整数值。
谢谢@TetsuyaYamamoto 这给了我同样的错误信息。
尝试从浏览器 cookie 存储中删除/清除与您的站点/本地主机相关的所有 cookie，我之前做过，突然一切都解决了。

标签： asp.net-mvc asp.net-identity-3

【解决方案1】：

山本哲也是对的。问题是我拿了一个干净的项目，运行它，并注册为用户，而主键是 GUID。然后我执行了所有需要的更改，以使主键变为整数。然后，当我运行它时，cookie 被发送到 OnValidateIdentity 并在那里崩溃，因为主键是 GUID。我清理了所有缓存，一切正常。

【讨论】：