src/Services/Ordering/Ordering.API/Application/Behaviors/ValidatorBehavior.cs

（完整代码） 1KB 

namespace Microsoft.eShopOnContainers.Services.Ordering.API.Application.Behaviors;

public class ValidatorBehavior<TRequest, TResponse> : IPipelineBehavior<TRequest, TResponse> where TRequest : IRequest<TResponse>
{
    private readonly ILogger<ValidatorBehavior<TRequest, TResponse>> _logger;
    private readonly IEnumerable<IValidator<TRequest>> _validators;

    public ValidatorBehavior(IEnumerable<IValidator<TRequest>> validators, ILogger<ValidatorBehavior<TRequest, TResponse>> logger)
    {
        _validators = validators;
        _logger = logger;
    }

    public async Task<TResponse> Handle(TRequest request, CancellationToken cancellationToken, RequestHandlerDelegate<TResponse> next)
    {
        var typeName = request.GetGenericTypeName();

        _logger.LogInformation("----- Validating command {CommandType}", typeName);

        var failures = _validators
            .Select(v => v.Validate(request))
            .SelectMany(result => result.Errors)
            .Where(error => error != null)
            .ToList();

        if (failures.Any())
        {
            _logger.LogWarning("Validation errors - {CommandType} - Command: {@Command} - Errors: {@ValidationErrors}", typeName, request, failures);

            throw new OrderingDomainException(
                $"Command Validation Errors for type {typeof(TRequest).Name}", new ValidationException("Validation exception", failures));
        }

        return await next();
    }
}

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