编辑“︁C Sharp 属性验证”︁（章节）

== 实际应用案例 ==

=== 电商系统价格验证 ===
<syntaxhighlight lang="csharp">
public class Product
{
    private decimal _originalPrice;
    private decimal _discountedPrice;
    
    public decimal OriginalPrice
    {
        get => _originalPrice;
        set => _originalPrice = value >= 0 ? value : 
            throw new ArgumentException("原价不能为负");
    }
    
    public decimal DiscountedPrice
    {
        get => _discountedPrice;
        set
        {
            if (value < 0)
                throw new ArgumentException("折扣价不能为负");
            if (value > OriginalPrice)
                throw new ArgumentException("折扣价不能高于原价");
            _discountedPrice = value;
        }
    }
}
</syntaxhighlight>

=== 用户注册表单验证 ===
结合WPF/MVVM模式的典型实现：

<syntaxhighlight lang="csharp">
public class RegistrationViewModel : INotifyPropertyChanged, INotifyDataErrorInfo
{
    private string _email;
    private readonly Dictionary<string, List<string>> _errors = new();
    
    [Required]
    [EmailAddress]
    public string Email
    {
        get => _email;
        set
        {
            _email = value;
            ValidateEmail();
            OnPropertyChanged();
        }
    }
    
    private void ValidateEmail()
    {
        ClearErrors(nameof(Email));
        
        if (string.IsNullOrWhiteSpace(Email))
            AddError(nameof(Email), "邮箱地址不能为空");
        else if (!new EmailAddressAttribute().IsValid(Email))
            AddError(nameof(Email), "邮箱格式无效");
    }
    
    // INotifyDataErrorInfo实现...
}
</syntaxhighlight>