如何在ASP.NET MVC应用中自定义注册表中密码字段的错误信息？

public class PasswordValidator : ValidationAttribute
{
    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
    {
        // 自定义密码验证逻辑
        string password = value as string;
        if (password == null || password.Length < 8)
        {
            return new ValidationResult("密码长度必须至少为8个字符。");
        }

        return ValidationResult.Success;
    }
}

public class RegisterViewModel
{
    // 其他属性...

    [PasswordValidator]
    public string Password { get; set; }

    // 其他属性...
}

@model RegisterViewModel

@using (Html.BeginForm())
{
    // 其他表单字段...

    @Html.PasswordFor(m => m.Password)
    @Html.ValidationMessageFor(m => m.Password)

    // 其他表单字段...

    <button type="submit">注册</button>
}