初始化

FutureMailAPI/DTOs/FileUploadDTOs.cs

@@ -0,0 +1,47 @@
+using Microsoft.AspNetCore.Http;
+
+namespace FutureMailAPI.DTOs
+{
+    public class FileUploadDto
+    {
+        public string FileName { get; set; } = string.Empty;
+        public string ContentType { get; set; } = string.Empty;
+        public long FileSize { get; set; }
+        public string FilePath { get; set; } = string.Empty;
+        public string FileUrl { get; set; } = string.Empty;
+        public string ThumbnailUrl { get; set; } = string.Empty;
+        public AttachmentType Type { get; set; }
+    }
+    
+    public class FileUploadRequestDto
+    {
+        public AttachmentType Type { get; set; }
+        public string? Category { get; set; } // 分类：avatar, attachment等
+    }
+    
+    public class FileUploadWithFileRequestDto : FileUploadRequestDto
+    {
+        public IFormFile File { get; set; } = null!;
+    }
+    
+    public class FileUploadResponseDto
+    {
+        public string FileId { get; set; } = string.Empty;
+        public string FileName { get; set; } = string.Empty;
+        public string FileUrl { get; set; } = string.Empty;
+        public string ThumbnailUrl { get; set; } = string.Empty;
+        public long FileSize { get; set; }
+        public string ContentType { get; set; } = string.Empty;
+        public AttachmentType Type { get; set; }
+        public DateTime UploadedAt { get; set; }
+    }
+    
+    public enum AttachmentType
+    {
+        IMAGE,
+        VOICE,
+        VIDEO,
+        DOCUMENT,
+        OTHER
+    }
+}