Identity-修改Error错误提示为中文

第一步：重写IdentityErrorDescriber

public class CustomIdentityErrorDescriber : IdentityErrorDescriber
    {
        public override IdentityError DefaultError() { return new IdentityError { Code = nameof(DefaultError), Description = $"未知错误！" }; }
        public override IdentityError ConcurrencyFailure() { return new IdentityError { Code = nameof(ConcurrencyFailure), Description = "并发错误，对象已被修改！" }; }
        public override IdentityError PasswordMismatch() { return new IdentityError { Code = "Password", Description = "密码错误！" }; }
        public override IdentityError InvalidToken() { return new IdentityError { Code = nameof(InvalidToken), Description = "Invalid token." }; }
        public override IdentityError LoginAlreadyAssociated() { return new IdentityError { Code = nameof(LoginAlreadyAssociated), Description = "当前用户已经登录！" }; }
        public override IdentityError InvalidUserName(string userName) { return new IdentityError { Code = "UserName", Description = $"用户名 '{userName}' 错误，只可以包含数字和字母！" }; }
        public override IdentityError InvalidEmail(string email) { return new IdentityError { Code = "Email", Description = $"邮箱 '{email}' 格式错误！" }; }
        public override IdentityError DuplicateUserName(string userName) { return new IdentityError { Code = "UserName", Description = $"用户名 '{userName}' 已存在！" }; }
        public override IdentityError DuplicateEmail(string email) { return new IdentityError { Code = "Email", Description = $"邮箱 '{email}' 已经存在！" }; }
        public override IdentityError InvalidRoleName(string role) { return new IdentityError { Code = nameof(InvalidRoleName), Description = $"角色 '{role}' 验证错误！" }; }
        public override IdentityError DuplicateRoleName(string role) { return new IdentityError { Code = nameof(DuplicateRoleName), Description = $"角色名 '{role}' 已经存在！" }; }
        public override IdentityError UserAlreadyHasPassword() { return new IdentityError { Code = nameof(UserAlreadyHasPassword), Description = "User already has a password set." }; }
        public override IdentityError UserLockoutNotEnabled() { return new IdentityError { Code = nameof(UserLockoutNotEnabled), Description = "Lockout is not enabled for this user." }; }
        public override IdentityError UserAlreadyInRole(string role) { return new IdentityError { Code = nameof(UserAlreadyInRole), Description = $"User already in role '{role}'." }; }
        public override IdentityError UserNotInRole(string role) { return new IdentityError { Code = nameof(UserNotInRole), Description = $"User is not in role '{role}'." }; }
        public override IdentityError PasswordTooShort(int length) { return new IdentityError { Code ="Password", Description = $"密码至少 {length} 位！" }; }
        public override IdentityError PasswordRequiresNonAlphanumeric() { return new IdentityError { Code = "Password", Description = "密码必须至少有一个非字母数字字符." }; }
        public override IdentityError PasswordRequiresDigit() { return new IdentityError { Code = "Password", Description = "密码至少有一个数字 ('0'-'9')." }; }
        public override IdentityError PasswordRequiresLower() { return new IdentityError { Code = "Password", Description = "密码必须包含小写字母 ('a'-'z')." }; }
        public override IdentityError PasswordRequiresUpper() { return new IdentityError { Code = "Password", Description = "密码必须包含大写字母 ('A'-'Z')." }; }
    }

第二步：

在Startup当中注册

public void ConfigureServices(IServiceCollection services)
       {

services.AddIdentity<SmartParWebUser, SmartParWebRole>()

.AddErrorDescriber<CustomIdentityErrorDescriber>();
        }

ok测试代码看结果！已经成中文。