下载课件时将所有课件打包成一个压缩包，名称为 课件名称-时间

Tiobon.Core.Services/Ghre/Ghre_CourseWareServices.cs

@@ -154,9 +154,11 @@ public class Ghre_CourseWareServices : BaseServices<Ghre_CourseWare, Ghre_Course
         var files = attachments.Select(x => $"{webRootPath}{"\\" + x.RelativePath}").ToArray();
         if (files.Length > 0)
         {
-            CreateZip($"{webRootPath}{outPath}", files);
+            if (files.Length > 1)
+                CreateZip($"{webRootPath}{outPath}", files);
+            else
+                outPath = files[0];
             return ServiceResult<string>.OprateSuccess(null, outPath);
-
         }
         else
             return ServiceResult<string>.OprateFailed("该课件无附件！");