/// <summary>
/// 获得头像缩略图流
/// </summary>
/// <param name="fileId">文件信息ID（Base_Article中的ID）</param>
/// <param name="thumbnailSize">缩略图大小</param>
/// <returns>缩略图流</returns>
public Stream GetSysAvatarThumbnail(int fileId)
{
Stream targetStream = null;
var myArticle = SiteManager.Kernel.Get <EFAuditDataService <Base_Article> >();
var art = myArticle.GetQuery().Include(a => a.Exts).FirstOrDefault(a => a.Id == fileId);
var filekeyId = Catalog.GetExtByName(Catalog.GetRootId(), SystemTypes.Root.Key).Id;
var filekey = art.Exts.FirstOrDefault(e => e.CatlogExtId == filekeyId).Value;
Stream sourceStream = StreamCache[filekey];
if (sourceStream == null)
{
return(null);
}
targetStream = FileExtensionTypeHelper.GetThumbnail(sourceStream, ThumbnailSize.Large);
//所以要手动释放
//sourceStream.Flush();
//sourceStream.Close();
//targetStream.Position = 0;
sourceStream.Position = 0;
return(sourceStream);
}
/// <summary>
/// 获得文件缩略图流
/// </summary>
/// <param name="fileId">文件信息ID</param>
/// <param name="thumbnailSize">缩略图大小</param>
/// <returns>缩略图流</returns>
public Stream GetFileThumbnail(int fileId, Size thumbnailSize)
{
Stream targetStream = null;
Stream sourceStream = GetFileStream(fileId);
if (sourceStream == null)
{
return(null);
}
targetStream = FileExtensionTypeHelper.GetThumbnail(sourceStream, thumbnailSize);
//所以要手动释放
sourceStream.Flush();
sourceStream.Close();
targetStream.Position = 0;
return(targetStream);
}
/// <summary>
/// 获得文件缩略图流
/// </summary>
/// <param name="id">文件信息ID</param>
/// <param name="thumbnailSize">缩略图大小</param>
/// <returns>缩略图流</returns>
public Stream GetThumbnail(DirectoryInfo directoryInfo, string key, Size thumbnailSize)
{
Stream targetStream = null;
DiskFileInfo info = Get(directoryInfo, key);
if (info == null)
{
return(null);
}
Stream sourceStream = info.FileStream;
if (sourceStream == null)
{
return(null);
}
targetStream = FileExtensionTypeHelper.GetThumbnail(sourceStream, thumbnailSize);
//所以要手动释放
sourceStream.Flush();
sourceStream.Close();
return(targetStream);
}