48 lines
1.4 KiB
C#
48 lines
1.4 KiB
C#
using FluentValidation;
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using MediatR;
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namespace MyNewProjectName.Application.Behaviors;
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/// <summary>
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/// Validation behavior for MediatR pipeline
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/// </summary>
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public class ValidationBehavior<TRequest, TResponse> : IPipelineBehavior<TRequest, TResponse>
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where TRequest : notnull
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{
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private readonly IEnumerable<IValidator<TRequest>> _validators;
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public ValidationBehavior(IEnumerable<IValidator<TRequest>> validators)
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{
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_validators = validators;
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}
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public async Task<TResponse> Handle(TRequest request, RequestHandlerDelegate<TResponse> next, CancellationToken cancellationToken)
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{
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if (!_validators.Any())
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{
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return await next();
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}
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var context = new ValidationContext<TRequest>(request);
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var validationResults = await Task.WhenAll(
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_validators.Select(v => v.ValidateAsync(context, cancellationToken)));
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var failures = validationResults
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.Where(r => r.Errors.Any())
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.SelectMany(r => r.Errors)
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.ToList();
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if (failures.Any())
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{
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var errors = failures
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.GroupBy(e => e.PropertyName, e => e.ErrorMessage)
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.ToDictionary(g => g.Key, g => g.ToArray());
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throw new MyNewProjectName.Domain.Exceptions.ValidationException(errors);
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}
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return await next();
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}
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}
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