**ReadFileContent** 读取附件内容 **返回值** byte[] **参数** | 名称 | 类型 | 描述 |必填 | --- | --- | --- |--- | |content| AM_AttachmentContent | 文件内容对象 |是 | db| 当前登录用户后缀| 是 **示例** ```         private static byte[] ReadFile(Entities objContext, int entityId, int bizId, string fileName)         {             var at = objContext.AM_Attachment.Include(a => a.AM_AttachmentContent).FirstOrDefault(a => a.BizID == bizId && a.EntityID == entityId && a.Name == fileName); if (at != null) { var ac = at.AM_AttachmentContent.OrderByDescending(c => c.UploadTime).FirstOrDefault(); if (ac != null) { return AttachmentMan.ReadFileContent(ac, objContext.DBName); } } return null;         } ```