Zhomfr.Validation.Rules.Database 0.6.0

Validation Rules for Database

⚠️ Warning: Active Development (< 1.0.0)

Prior to the release of stable version 1.0.0, this library follows SemVer for initial development. This means breaking changes may occur even in minor releases (0.x).

We strongly recommend pinning the package version in your .csproj to avoid unexpected build errors.

A powerful, intuitive collection of custom validation attributes built directly on top of the standard .NET System.ComponentModel.DataAnnotations infrastructure. Designed to eliminate boilerplate code, this library brings a rich set of production-ready validation rules—inspired by robust ecosystem standards (like Laravel's validation features) — allowing you to validate models cleanly using declarative attributes without reinventing the wheel.

Key Features

• Standard DataAnnotations Integration: Seamlessly works with ASP.NET Core, Entity Framework, and standard Validator methods out of the box.
• Rich Set of Built-in Rules: Covers frequent validation scenarios that are missing from standard .NET, preventing you from writing repetitive custom validators over and over again.
• Intuitive Declarative Syntax: Clean and expressive attributes to keep your domain models and DTOs readable and maintainable.
• Customizable Error Messages: Fully supports localized and custom error message templates via standard ErrorMessage properties.

📦 Installation

Install package:

dotnet add package Zhomfr.Validation.Rules.Database

After add namespace in using section:

using Zhomfr.Validation.Rules.Database;

Available Methods

<table> <tr valign="top"> <td>

• Exist
• Unique

</td> </tr> </table>

🛠️ Features and Examples

Exist

Validates that a record with the specified property value exists in the database. Supports any entity type and property that can be resolved via .

public class StubModel
{
    [Exist<StubDbContext,StubEntity>(nameof(StubEntity.Name))]
    public string Name { get; set; } = "user@example.com";
}

Unique

Validates that the value is unique within the specified database table and column. This rule fails if a record with the same property value already exists.

public class StubModel
{
    [Unique<StubDbContext,StubEntity>(nameof(StubEntity.Name))]
    public string Name { get; set; } = "user@example.com";
}