public class ClassicMovieWithClientValidatorAttribute :
    ValidationAttribute, IClientModelValidator
    public ClassicMovieWithClientValidatorAttribute(int year)
        Year = year;
    public int Year { get; }
    public void AddValidation(ClientModelValidationContext context)
        MergeAttribute(context.Attributes, "data-val", "true");
        MergeAttribute(context.Attributes, "data-val-classicmovie", GetErrorMessage());
        var year = Year.ToString(CultureInfo.InvariantCulture);
        MergeAttribute(context.Attributes, "data-val-classicmovie-year", year);
    public string GetErrorMessage() =>
        $"Classic movies must have a release year no later than {Year}.";
    protected override ValidationResult IsValid(object value,
        ValidationContext validationContext)
        var movie = (Movie)validationContext.ObjectInstance;
        var releaseYear = ((DateTime)value).Year;
        if (movie.Genre == Genre.Classic && releaseYear > Year)
            return new ValidationResult(GetErrorMessage());
        return ValidationResult.Success;
    private bool MergeAttribute(IDictionary<string, string> attributes, string key, string value)
        if (attributes.ContainsKey(key))
            return false;
        attributes.Add(key, value);
        return true;
禁用客户端验证
下面的代码在页中禁用客户端验证 Razor ：
C#