如何在C#web应用程序中配置ASP.Net标识，以便使用电子邮件地址作为用户名

我正在从事一个使用ASP.Net Identity 2.0的项目。我的项目是基于ASP.NET4.5C#Web应用程序的

我想更改身份的配置，以便我可以使用电子邮件地址而不是用户名。但是，当我尝试注册一条记录时，错误向我显示，用户名只能使用字母数字

我在我的C#web应用程序中对IdentityModels.cs做了以下更改，但它不起作用：

public UserManager()
   : base(new UserStore<ApplicationUser>(new ApplicationDbContext()))
    {
        UserValidator = new UserValidator<ApplicationUser>(this) {
                AllowOnlyAlphanumericUserNames = false };
    }

公共用户管理器（） ：base（新的用户存储（新的ApplicationDbContext（））） { UserValidator=新的UserValidator（此）{ AllowOnlyAlphanumericUserNames=false}； } 我该怎么办

---

请帮帮我

首先更改代码如下。

   public UserManager()
   : base(new UserStore<ApplicationUser>(new ApplicationDbContext()))
    {
        UserValidator = new UserValidator<ApplicationUser>(this) {
                AllowOnlyAlphanumericUserNames = true,
                RequireUniqueEmail = true };
    }

---

更改应用程序以支持该配置设置，以便轻松完成此工作，您无需进行任何数据库更改。

感谢您的解决方案！我在C#项目中检查了ASP.Net标识，发现它是1.0版（默认）。所以，我安装了ASP.NETIndetityVersion2.0，它确实对我有用。

// Configure the application user manager which is used in this application.
    public class ApplicationUserManager : UserManager<ApplicationUser>
    {
        public ApplicationUserManager(IUserStore<ApplicationUser> store)
            : base(store)
        {
        }
        public static ApplicationUserManager Create(IdentityFactoryOptions<ApplicationUserManager> options,
            IOwinContext context)
        {
            var manager = new ApplicationUserManager(new UserStore<ApplicationUser>(context.Get<ApplicationDbContext>()));
            // Configure validation logic for usernames
            manager.UserValidator = new UserValidator<ApplicationUser>(manager)
            {
                AllowOnlyAlphanumericUserNames = false,
                RequireUniqueEmail = true
            };

            // Configure validation logic for passwords
            manager.PasswordValidator = new PasswordValidator
            {
                RequiredLength = 6,
                RequireNonLetterOrDigit = true,
                RequireDigit = true,
                RequireLowercase = true,
                RequireUppercase = true,
            };

            // Configure user lockout defaults
            manager.UserLockoutEnabledByDefault = true;
            manager.DefaultAccountLockoutTimeSpan = TimeSpan.FromMinutes(5);
            manager.MaxFailedAccessAttemptsBeforeLockout = 5;

            // Register two factor authentication providers. This application uses Phone and Emails as a step of receiving a code for verifying the user
            // You can write your own provider and plug it in here.
            manager.RegisterTwoFactorProvider("Phone Code", new PhoneNumberTokenProvider<ApplicationUser>
            {
                MessageFormat = "Your security code is {0}"
            });
            manager.RegisterTwoFactorProvider("Email Code", new EmailTokenProvider<ApplicationUser>
            {
                Subject = "Security Code",
                BodyFormat = "Your security code is {0}"
            });
            manager.EmailService = new EmailService();
            manager.SmsService = new SmsService();
            var dataProtectionProvider = options.DataProtectionProvider;
            if (dataProtectionProvider != null)
            {
                manager.UserTokenProvider =
                    new DataProtectorTokenProvider<ApplicationUser>(dataProtectionProvider.Create("ASP.NET Identity"));
            }
            return manager;
        }
    }

        app.CreatePerOwinContext(ApplicationDbContext.Create);
        app.CreatePerOwinContext<ApplicationUserManager>(ApplicationUserManager.Create);
        app.CreatePerOwinContext<ApplicationSignInManager>(ApplicationSignInManager.Create);