如何在 ASP.NET 标识中使自定义配置文件信息唯一

Question

我在 Visual Studio 2013 上使用带有 asp.net Identity 2.0 的 Web 项目。我已按照 page 上的说明创建了一个名为 screenName 的自定义新字段。一切似乎都运作良好。

但是，我想更进一步，让 screenName 在数据库中是唯一的。这意味着 ApplicationUserManager 必须在注册用户之前检查是否使用了屏幕名称。我怎样才能需要一个唯一的 screenName 并完成它？

这是我的代码：

AccountControler.cs（添加 screenName = model.screenName）

public async Task<ActionResult> Register(RegisterViewModel model)
    {
        if (ModelState.IsValid)
        {
            var user = new ApplicationUser { UserName = model.Email, Email = model.Email, screenName = model.screenName };

            var result = await UserManager.CreateAsync(user, model.Password);
            if (result.Succeeded)
            {
                var code = await UserManager.GenerateEmailConfirmationTokenAsync(user.Id);
                var callbackUrl = Url.Action("ConfirmEmail", "Account", new { userId = user.Id, code = code }, protocol: Request.Url.Scheme);
                await UserManager.SendEmailAsync(user.Id, "bla bla bla", "Thank you for your bla bla bla registration. Please confirm your account by clicking this link: <a href=\"" + callbackUrl + "\">link</a>");
                ViewBag.Link = callbackUrl;
                return View("DisplayEmail");
            }
            AddErrors(result);
        }

        // If we got this far, something failed, redisplay form
        return View(model);
    }

AccountViewModel.cs

public class RegisterViewModel
{
 [Required]
 [StringLength(20, ErrorMessage = "The {0} must be at least {2} characters long.", MinimumLength = 6)]
    [Display(Name = "screenName")]
    public string screenName { get; set; }
}

IdentityModel.cs（添加公共字符串 screenName { get; set; }）

public class ApplicationUser : IdentityUser
{
    public string screenName { get; set; }
    public async Task<ClaimsIdentity> GenerateUserIdentityAsync(UserManager<ApplicationUser> manager)
    {
        // Note the authenticationType must match the one defined in CookieAuthenticationOptions.AuthenticationType
        var userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);
        // Add custom user claims here

        return userIdentity;
    }
}

Register.cshtml

<div class="form-group">
@Html.LabelFor(m => m.screenName, new { @class = "col-md-2 control-label" }) 
<div class="col-md-10"> @Html.TextBoxFor(m => m.screenName, new { @class = "form-control" }) 
</div>
</div>

SQL 服务器

 GO
 CREATE UNIQUE NONCLUSTERED INDEX [screenNameIndex]
 ON [dbo].[AspNetUsers]([screenName] ASC);

例如，ApplicationUserManager 需要在 identityConfig.cs 上具有以下代码的唯一电子邮件。如何对自定义 screenName 执行相同操作？

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
        };

Answer 1

您需要手动检查数据库中是否存在具有此屏幕名称的记录：

类似这样的：

public async Task<ActionResult> Register(RegisterViewModel model)
{
    if (ModelState.IsValid)
    {
        // somehow obtain your DbContext object
        var existsDuplicate = dbContext.Users.Any(u => u.screenName == model.screenName);
        if(existsDuplicate)
        {
            ModelState.AddModelError("screenName", "Screen Name is already taken, please choose another one");
            return View(model);
        }


        // the rest of controller is unchanged
        var user = new ApplicationUser { UserName = model.Email, Email = model.Email, screenName = model.screenName };

        var result = await UserManager.CreateAsync(user, model.Password);
        if (result.Succeeded)
        {
            var code = await UserManager.GenerateEmailConfirmationTokenAsync(user.Id);
            var callbackUrl = Url.Action("ConfirmEmail", "Account", new { userId = user.Id, code = code }, protocol: Request.Url.Scheme);
            await UserManager.SendEmailAsync(user.Id, "bla bla bla", "Thank you for your bla bla bla registration. Please confirm your account by clicking this link: <a href=\"" + callbackUrl + "\">link</a>");
            ViewBag.Link = callbackUrl;
            return View("DisplayEmail");
        }
        AddErrors(result);
    }

    // If we got this far, something failed, redisplay form
    return View(model);
}