如何自定义 Asp.net Identity 2 用户名已采用验证消息（名称 XYZ 已采用。）？谢谢
【问题讨论】：
标签： asp.net asp.net-mvc asp.net-mvc-5 asp.net-identity asp.net-identity-2
嗯，我没有找到任何简单的解决方案来解决这个问题。简单地说，我的意思是修改属性/模型/控制器中的一些消息。
一种可能的解决方案是：
执行后
var result = await UserManager.CreateAsync(user, model.Password);
如果结果不成功，您可以检查它的错误属性“名称 XYZ 已被占用”。模式并将其替换为您的自定义消息。
另一种解决方案（这是我的首选方式）是编写一个自定义的UserValidation 类：
/// <summary>
/// Validates users before they are saved to an IUserStore
/// </summary>
/// <typeparam name="TUser"></typeparam>
public class CustomUserValidator<TUser> : UserValidator<TUser, string>
where TUser : ApplicationUser
{
/// <summary>
/// Constructor
/// </summary>
/// <param name="manager"></param>
public CustomUserValidator(UserManager<TUser, string> manager) : base(manager)
{
this.Manager = manager;
}
private UserManager<TUser, string> Manager { get; set; }
/// <summary>
/// Validates a user before saving
/// </summary>
/// <param name="item"></param>
/// <returns></returns>
public override async Task<IdentityResult> ValidateAsync(TUser item)
{
if (item == null)
{
throw new ArgumentNullException("item");
}
var errors = new List<string>();
await ValidateUserName(item, errors);
if (RequireUniqueEmail)
{
await ValidateEmail(item, errors);
}
if (errors.Count > 0)
{
return IdentityResult.Failed(errors.ToArray());
}
return IdentityResult.Success;
}
private async Task ValidateUserName(TUser user, List<string> errors)
{
if (string.IsNullOrWhiteSpace(user.UserName))
{
errors.Add(String.Format(CultureInfo.CurrentCulture, Resources.PropertyTooShort, "Name"));
}
else if (AllowOnlyAlphanumericUserNames && !Regex.IsMatch(user.UserName, @"^[A-Za-z0-9@_\.]+$"))
{
// If any characters are not letters or digits, its an illegal user name
errors.Add(String.Format(CultureInfo.CurrentCulture, Resources.InvalidUserName, user.UserName));
}
else
{
var owner = await Manager.FindByNameAsync(user.UserName);
if (owner != null && !EqualityComparer<string>.Default.Equals(owner.Id, user.Id))
{
errors.Add(String.Format(CultureInfo.CurrentCulture, Resources.DuplicateName, user.UserName));
}
}
}
// make sure email is not empty, valid, and unique
private async Task ValidateEmail(TUser user, List<string> errors)
{
if (!user.Email.IsNullOrWhiteSpace())
{
if (string.IsNullOrWhiteSpace(user.Email))
{
errors.Add(String.Format(CultureInfo.CurrentCulture, Resources.PropertyTooShort, "Email"));
return;
}
try
{
var m = new MailAddress(user.Email);
}
catch (FormatException)
{
errors.Add(String.Format(CultureInfo.CurrentCulture, Resources.InvalidEmail, email));
return;
}
}
var owner = await Manager.FindByEmailAsync(user.Email);
if (owner != null && !EqualityComparer<string>.Default.Equals(owner.Id, user.Id))
{
errors.Add(String.Format(CultureInfo.CurrentCulture, Resources.DuplicateEmail, email));
}
}
}
您可以看到所有正在使用的资源验证错误消息，因此通过在资源中指定自定义格式，您将能够自定义这些消息。
您可以在ApplicationUserManager 类，Create 方法中注册您的验证器：
public static ApplicationUserManager Create(IdentityFactoryOptions<ApplicationUserManager> options, IOwinContext context)
{
manager.UserValidator = new CustomUserValidator<ApplicationUser>(manager)
{
AllowOnlyAlphanumericUserNames = false,
RequireUniqueEmail = true
};
}
【讨论】：
IdentityResult 的情况下替换错误消息，因为Errors 是只读的 IEnumerable。
'Resources' is inaccessible due to its protection level。如果我检查 Microsoft.AspNet.Identity.Resources 类，它被标记为内部。
'Resources' is inaccessible due to its protection level 此处：stackoverflow.com/questions/39123039/…
Another solution (this is my preferred way) is to write a custom UserValidation class... You can see that for all the validation error messages Resources being used, So by specifying a custom format in your resources you will be able to customize those messages.
这比接受的答案要容易得多。
添加一个class 并从IdentityErrorDescriber 继承它
public class AppErrorDescriber : IdentityErrorDescriber
{
public override IdentityError DuplicateUserName(string userName)
{
var error = base.DuplicateUserName(userName);
error.Description = "This email address has already been registered. Please log in.";
return error;
}
}
现在在你的 Startup.cs 中使用新类，就是这样。
services.AddDefaultIdentity<AppUser>(options => ... )
.AddErrorDescriber<AppErrorDescriber>();
【讨论】：
只需像这样自定义您的 AddErrors 方法：
private void AddErrors(IdentityResult result)
{
foreach (var error in result.Errors)
{
if (error.StartsWith("Name"))
{
var NameToEmail= Regex.Replace(error,"Name","Email");
ModelState.AddModelError("", NameToEmail);
}
else
{
ModelState.AddModelError("", error);
}
}
}
【讨论】：
使用XLocalizer - Nuget 包进行本地化。 请参阅文档here。
【讨论】：
将您自己的属性添加到ApplicationUser 类的简单方法，例如：
public class AppUser:IdentityUser
{
public string MyUserName{get; set;}
}
【讨论】：