/// <summary>
/// 删除文件系统中的文件
/// </summary>
/// <param name="attachment">附件</param>
protected void DeleteStoredFile(T attachment)
{
//如果属于图片附件，则还需删除生成的图片缩略图及附件原图
if (attachment.MediaType == MediaType.Image)
{
//删除所有图(包括原始图、缩略图)
StoreProvider.DeleteFiles(attachment.GetRelativePath(), attachment.FileName);
}
else
{
StoreProvider.DeleteFile(attachment.GetRelativePath(), attachment.FileName);
}
}