【修改】修改上传功能：txt文件预览乱码；

Learun.Framework.Ultimate V7/Learun.Application.Web/Areas/LR_SystemModule/Controllers/AnnexesController.cs

@@ -270,7 +270,8 @@ namespace Learun.Application.Web.Areas.LR_SystemModule.Controllers
                     Response.ContentType = "application/pdf";
                     break;
             }
-            Response.Charset = "GB2312";
+            //Response.Charset = "GB2312";
+            Response.Charset = "utf-8"; //修改txt文件预览乱码
             Response.WriteFile(filepath);
             //Response.BinaryWrite(ms.ToArray());
         }