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Create: 2025-05-03 Update: 2025-07-03 22:17:17

قابلیت‌های جدید Data Annotations در دات نت ۸

در نسخه جدید NET 8.، ویژگی‌های Data Annotations پیشرفت‌های قابل توجهی داشته‌اند. این ویژگی‌ها، کدنویسی معتبرسازی داده‌ها را بسیار ساده‌تر و تمیزتر کرده است. در ادامه به صورت گام به گام این ویژگی‌های جدید را بررسی می‌کنیم:

۱. ویژگی Length
این Annotation برای مشخص کردن حداقل و حداکثر طول رشته استفاده می‌شود.

[Length(2, 30)]
public string Name { get; set; }

[Length(2, 255)]
public string Description { get; set; }

در مثال بالا:
- مقدار Name باید حداقل ۲ و حداکثر ۳۰ کاراکتر داشته باشد.
- مقدار Description باید حداقل ۲ و حداکثر ۲۵۵ کاراکتر داشته باشد.

---

۲. ویژگی Range با پارامترهای Exclusive
ویژگی Range حالا قابلیت مشخص کردن مقادیر انحصاری را نیز دارد.

[Range(1, 1000, MinimumIsExclusive = true, MaximumIsExclusive = false)]
public decimal Price { get; set; }

در این مثال:
- مقدار Price باید بزرگتر از ۱ (به دلیل MinimumIsExclusive = true) و کوچکتر یا مساوی ۱۰۰۰ (به دلیل MaximumIsExclusive = false) باشد.

---

۳. ویژگی AllowedValues
این Annotation مقادیر مجاز برای یک خصوصیت را مشخص می‌کند.

[AllowedValues("S", "M", "L", "XL", "XXL")]
public string Size { get; set; }

در اینجا، تنها مقادیر S, M, L, XL, XXL برای Size قابل قبول هستند.

---

۴. ویژگی DeniedValues
برای مشخص کردن مقادیری که غیرمجاز هستند استفاده می‌شود.

[DeniedValues("Electronics", "Computers")]
public string Category { get; set; }

در این مثال، مقادیر Electronics و Computers برای Category ممنوع هستند.

---

۵. ویژگی Base64String
برای معتبرسازی اینکه مقدار یک رشته به صورت Base64 باشد استفاده می‌شود.

[Base64String]
public string Image { get; set; }

این اطمینان را ایجاد می‌کند که Image حاوی یک رشته معتبر Base64 است.

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[Length(2, 30)]
public string Name { get; set; }

[Length(2, 255)]
public string Description { get; set; }

[Range(1, 1000, MinimumIsExclusive = true, MaximumIsExclusive = false)]
public decimal Price { get; set; }

[AllowedValues("S", "M", "L", "XL", "XXL")]
public string Size { get; set; }

[DeniedValues("Electronics", "Computers")]
public string Category { get; set; }

[Base64String]
public string Image { get; set; }

Docs

System.ComponentModel.DataAnnotations Namespace

Provides attribute classes that are used to define metadata for ASP.NET MVC and ASP.NET data controls.

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قابلیت‌های جدید Data Annotations در دات نت ۸

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