https://github.com/jonsequitur/its.validation

A C# library for composing your core business rules and freeing them from framework-specific validation.
https://github.com/jonsequitur/its.validation

Last synced: 5 days ago
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A C# library for composing your core business rules and freeing them from framework-specific validation.

• Host: GitHub
• URL: https://github.com/jonsequitur/its.validation
• Owner: jonsequitur
• License: other
• Created: 2014-11-08T22:43:43.000Z (about 10 years ago)
• Default Branch: master
• Last Pushed: 2016-05-24T00:55:52.000Z (over 8 years ago)
• Last Synced: 2024-11-01T14:43:16.885Z (12 days ago)
• Language: C#
• Homepage:
• Size: 356 KB
• Stars: 17
• Watchers: 8
• Forks: 5
• Open Issues: 2
• Metadata Files:
  • Readme: README.md
  • License: license.txt

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README

        
### A C# library for composing your core business rules and freeing them from framework-specific validation.

[![Build Status](https://ci.appveyor.com/api/projects/status/github/jonsequitur/Its.Validation?svg=true&branch=master)](https://ci.appveyor.com/project/jonsequitur/its-validation)  [![NuGet Status](http://img.shields.io/nuget/v/Its.Validation.svg?style=flat)](https://www.nuget.org/packages/Its.Validation/)

Define a validation rule:

```csharp

var wontGoBadTooSoon = Validate.That(fruit => fruit.ExpirationDate > DateTime.Now.AddDays(5));

bool isValid = wontGoBadTooSoon.Check(lemon);

```

Compose it into other rules:

```csharp

var basketWontGoBadTooSoon = 

  Validate.That(basket =>

    basket.Fruits.Every(wontGoBadTooSoon));

```

Get information from the rule for display:

```csharp

var wontGoBadTooSoon = 

  Validate.That(fruit => 

    fruit.ExpirationDate.As("expiration") > DateTime.Now.AddDays(5));

```

Transform and format the information for display:

```csharp

var wontGoBadTooSoon = 

  Validate.That(fruit =>

      fruit.As("fruitname", f => f.Name).ExpirationDate.As("expiration") > DateTime.Now.AddDays(5.As("days_in_transit")))

    .WithMessage("A {fruitname} that expires on {expiration:D} won't last for {days_in_transit} days.");

// OR localized:

    .WithMessage(Resources.BasketMustPreventScurvy);

```

Combine rules:

```csharp

var plan = new ValidationPlan

               {

                    basketHasFruit,

                    basketWontGoBadTooSoon

               };

```

Define rule dependencies:

```csharp

var plan = new ValidationPlan

               {

                    basketHasFruit,               

                    basketWontGoBadTooSoon.When(basketHasFruit)

               };

```

Test your validation plan:

```csharp

var basket = new FruitBasket();

var failures = plan.Execute(basket);

failures.Count(f => f.Message == "Your basket must contain some fruit.")

        .Should()

        .Be(1);

```

Extend the validation results with your own types:

```csharp

var upcCodeExists = 

  Validation.That(fruit => database.UpcCodes.Exists(upc => upc.Code == fruit.UpcCode))

    .With(DatabaseErrors.UpcCodeDoesNotExist);

```