初始化

FutureMailAPI/Helpers/FileUploadOperationFilter.cs

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+using Microsoft.OpenApi.Models;
+using Swashbuckle.AspNetCore.SwaggerGen;
+using Microsoft.AspNetCore.Http;
+using System.Reflection;
+using System.Linq;
+
+namespace FutureMailAPI.Helpers
+{
+    /// <summary>
+    /// Swagger文件上传操作过滤器
+    /// </summary>
+    public class FileUploadOperationFilter : IOperationFilter
+    {
+        public void Apply(OpenApiOperation operation, OperationFilterContext context)
+        {
+            var fileUploadMime = "multipart/form-data";
+            if (operation.RequestBody == null || !operation.RequestBody.Content.Any(x => x.Key.Equals(fileUploadMime, StringComparison.InvariantCultureIgnoreCase)))
+                return;
+
+            var fileParams = context.MethodInfo.GetParameters()
+                .Where(p => p.ParameterType == typeof(IFormFile) || 
+                           (p.ParameterType.IsClass && p.ParameterType.GetProperties().Any(prop => prop.PropertyType == typeof(IFormFile))))
+                .ToList();
+                
+            if (!fileParams.Any())
+                return;
+
+            operation.RequestBody.Content[fileUploadMime].Schema.Properties =
+                fileParams.ToDictionary(k => k.Name!, v => new OpenApiSchema()
+                {
+                    Type = "string",
+                    Format = "binary"
+                });
+        }
+    }
+}