feat: 增加分页排序与FluentValidation

src/Application/TakeoutSaaS.Application/App/Common/Behaviors/ValidationBehavior.cs

@@ -0,0 +1,35 @@
+using FluentValidation;
+using MediatR;
+
+namespace TakeoutSaaS.Application.App.Common.Behaviors;
+
+/// <summary>
+/// MediatR 请求验证行为，统一触发 FluentValidation。
+/// </summary>
+/// <typeparam name="TRequest">请求类型。</typeparam>
+/// <typeparam name="TResponse">响应类型。</typeparam>
+public sealed class ValidationBehavior<TRequest, TResponse>(IEnumerable<IValidator<TRequest>> validators) : IPipelineBehavior<TRequest, TResponse>
+    where TRequest : notnull, IRequest<TResponse>
+{
+    private readonly IEnumerable<IValidator<TRequest>> _validators = validators;
+
+    /// <summary>
+    /// 执行验证并在通过时继续后续处理。
+    /// </summary>
+    public async Task<TResponse> Handle(TRequest request, RequestHandlerDelegate<TResponse> next, CancellationToken cancellationToken)
+    {
+        if (_validators.Any())
+        {
+            var context = new ValidationContext<TRequest>(request);
+            var validationResults = await Task.WhenAll(_validators.Select(v => v.ValidateAsync(context, cancellationToken)));
+            var failures = validationResults.SelectMany(r => r.Errors).Where(f => f is not null).ToList();
+
+            if (failures.Count > 0)
+            {
+                throw new ValidationException(failures);
+            }
+        }
+
+        return await next();
+    }
+}