Phema.Validation 3.0.8

There is a newer version of this package available.
See the version list below for details.
dotnet add package Phema.Validation --version 3.0.8
NuGet\Install-Package Phema.Validation -Version 3.0.8
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="Phema.Validation" Version="3.0.8" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Phema.Validation --version 3.0.8
#r "nuget: Phema.Validation, 3.0.8"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.
// Install Phema.Validation as a Cake Addin
#addin nuget:?package=Phema.Validation&version=3.0.8

// Install Phema.Validation as a Cake Tool
#tool nuget:?package=Phema.Validation&version=3.0.8

Phema.Validation

Build Status Nuget Nuget

Strongly typed expression-based validation library for .NET built on top of extension methods and full of latest C# features Can be used anywhere with Microsoft.Extensions.DependencyInjection package support

Installation

$> dotnet add package Phema.Validation

Usage (ASP.NET Core, HostedService examples)

// Add `IValidationContext` as scoped service
services.AddValidation(options => ...);

// Get or inject
var validationContext = serviceProvider.GetRequiredService<IValidationContext>();

// Validation key will be `Name` using default validation part provider
validationContext.When(person, p => p.Name)
  .Is(name => name == null)
  .AddError("Name must be set");

// Validation key will be `Address.Locations[0].Latitude` using default validation part provider
validationContext.When(person, p => p.Address.Locations[0].Latitude)
  .Is(latitude => ...custom check...)
  .AddError("Some custom check failed");

Validation conditions

  • Monads are not composable, so Is and IsNot, IsNull and IsNotNull... duplication
// Check for Phema.Validation.Conditions namespace
validationContext.When(person, p => p.Name)
  .IsNullOrWhitespace()
  .AddError("Name must be set");

// Use multiple conditions (joined with OR)
validationContext.When(person, p => p.Name)
  .IsNull()
  .HasLengthGreater(20)
  // .IsNotNull()
  // .IsEqual()
  // .IsMatch(regex)
  .AddError("Name is invalid");

Validation details

// Null if valid
var validationDetails = validationContext.When(person, p => p.Age)
  // Validation condition is valid
  .Is(() => false)
  .AddError("Age must be set");

// Use deconstruction
var (key, message) = validationContext.When(person, p => p.Age)
  .IsNull()
  .AddError("Age must be set");

// More deconstruction
var (key, message, severity) = validationContext.When(person, p => p.Age)
  .IsNull()
  .AddError("Age must be set");

Check validation

// Override default ValidationSeverity
validationContext.ValidationSeverity = ValidationSeverity.Warning;

// Throw exception when details severity greater than ValidationContext.ValidationSeverity
validationContext.When(person, p => p.Address)
  .IsNull()
  .AddFatal("Address is not presented!!!"); // If invalid throw ValidationConditionException

// Check if context is valid
validationContext.IsValid();
validationContext.EnsureIsValid(); // If invalid throw ValidationContextException

// Check concrete validation details
validationContext.IsValid(person, p => p.Age);
validationContext.EnsureIsValid(person, p => p.Age);

Compose and reuse validation rules

  • Call is allocation free
  • Static checks
  • Extensible as a IValidators and IValidationComponents
// Extensions
public static void ValidateCustomer(this IValidationContext validationContext, Customer customer)
{
  // Some checks
}

validationContext.ValidateCustomer(customer);

Validation part providers

  • ValidationPartResolver is a delegate, trying to get valdiation part from MemberInfo
  • Where are 2 built-in validation part providers
    • Default - just get MemberInfo.Name
    • DataMemberOrDefault - Try to get DataMemberAttribute.Name or use default implementation
// Configure DataMember validation part provider
services.AddValidation(options =>
  options.ValidationPartResolver = ValidationDefaults.DataMemberOrDefaultValidationPartResolver);

// Override validation parts with `DataMemberAttribute`
[DataMember(Name = "name")]
public string Name { get; set; }

Validation scopes

  • Use scopes when you need to have:
    • Same nested validation path multiple times
    • Empty validation details collection (syncing with parent context/scope)
    • ValidationSeverity override
// Validation key will be `Child.*ValidationPart*`
ValidateChild(validationContext.CreateScope(parent, p => p.Child))

// Validation key will be `Address.Locations[0].*ValidationPart*`
ValidateLocation(validationContext.CreateScope(person, p => p.Address.Locations[0]))

// Override local scope ValidationSeverity
using (var scope = validationContext.CreateScope(person, p => p.Address))
{
  scope.ValidationSeverity = ValidationSeverity.Warning;

  // Some scope validation checks syncing with validationContext
}

High performance with non-expression constructions

validationContext.When("key", value)
  .IsNull()
  .AddError("Value is null");

validationContext.CreateScope("key");

validationContext.IsValid("key");
validationContext.EnsureIsValid("key");
Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 was computed.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 was computed.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed. 
.NET Core netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard2.0 is compatible.  netstandard2.1 was computed. 
.NET Framework net461 was computed.  net462 was computed.  net463 was computed.  net47 was computed.  net471 was computed.  net472 was computed.  net48 was computed.  net481 was computed. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen40 was computed.  tizen60 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

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Version Downloads Last updated
3.1.10 967 10/12/2019
3.1.9 1,000 9/27/2019
3.1.8 929 9/25/2019
3.1.7 341 9/15/2019
3.1.6 305 9/8/2019
3.1.5 287 9/7/2019
3.1.4 284 9/7/2019
3.1.3 311 9/7/2019
3.1.2 296 8/25/2019
3.1.1 281 8/24/2019
3.1.0 281 8/23/2019
3.0.9 287 8/23/2019
3.0.8 295 8/22/2019
3.0.7 282 8/16/2019
3.0.6 313 7/30/2019
3.0.5 284 7/29/2019
3.0.4 301 7/29/2019
3.0.3 293 7/28/2019
3.0.2 284 7/21/2019