/// <summary>
/// 保存文件信息
/// </summary>
/// <param name="info">文件信息</param>
public DiskFileInfo Save(DirectoryInfo directoryInfo, DiskFileInfo info)
{
if (!directoryInfo.Exists)
{
directoryInfo.Create();
}
InnerSaveFile(directoryInfo.FullName, info.FileName, info.FileStream, info.FileChunkInfo);
//文件流清空
info.FileStream = null;
return(info);
}
/// <summary>
/// 获取文件信息（包括文件流），不存在返回null
/// </summary>
/// <param name="id">文件信息ID</param>
/// <returns></returns>
public DiskFileInfo Get(DirectoryInfo directoryInfo, string key)
{
FileInfo havedFile = InnerGetFileInfo(directoryInfo, key);
if (havedFile != null)
{
DiskFileInfo info = new DiskFileInfo();
info.FileStream = new FileStream(havedFile.FullName, FileMode.Open, FileAccess.Read);
info.FileName = havedFile.Name;
info.FileSize = havedFile.Length;
info.ContentType = havedFile.Extension;
return(info);
}
return(null);
}
/// <summary>
/// 获取所有文件信息列表（不包括文件流）
/// </summary>
/// <returns></returns>
public List <DiskFileInfo> GetAll(DirectoryInfo directoryInfo)
{
List <DiskFileInfo> rl = new List <DiskFileInfo>();
if (directoryInfo.Exists)
{
//查找文件
FileInfo[] files = directoryInfo.GetFiles();
foreach (FileInfo havedFilename in files)
{
DiskFileInfo a = new DiskFileInfo();
a.FileName = havedFilename.Name;
a.FileSize = havedFilename.Length;
a.ContentType = havedFilename.Extension;
rl.Add(a);
}
}
return(rl);
}
/// <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);
}