private string GetTempPath(string bookId)
{
var path = _storageDirectory.GetTempPath(bookId);
if (!Directory.Exists(path))
{
Directory.CreateDirectory(path);
}
return(path);
}
/// <summary>
/// 通过GUID获取存储图片文件实例缩略图。
/// </summary>
/// <param name="id">媒体文件Id。</param>
/// <param name="width">宽度。</param>
/// <param name="height">高度。</param>
/// <returns>返回存储缩略图实例。</returns>
public async Task <StoredPhysicalFile> FindThumbAsync(Guid id, int width, int height)
{
var file = await _sfdb.AsQueryable().InnerJoin <MediaFile>((sf, mf) => sf.FileId == mf.FileId)
.Where <MediaFile>(x => x.Id == id)
.Select <MediaFile>(x => x.Name)
.Select(x => new { x.FileId, x.ContentType })
.FirstOrDefaultAsync(reader => new StoredPhysicalFile(reader));
if (file == null)
{
return(null);
}
var thumbFile = new FileInfo(Path.Combine(_thumbs, file.PhysicalPath).Replace(".moz", $".{width}x{height}.moz"));
if (!thumbFile.Exists)
{
var storedFile = new FileInfo(Path.Combine(_media, file.PhysicalPath));
if (storedFile.Exists)
{
storedFile = storedFile.Resize(width, height, _directory.GetTempPath());
if (!Directory.Exists(thumbFile.DirectoryName))
{
Directory.CreateDirectory(thumbFile.DirectoryName);
}
storedFile.MoveTo(thumbFile.FullName);
}
}
file.PhysicalPath = thumbFile.FullName;
return(file);
}
public IActionResult OnPostSave()
{
var epub = _epubManager.Create(Input.BookId);
epub.AddToc();
epub.AddDefaultStyle();
var path = _storageDirectory.GetTempPath($"{Input.BookId}.epub");
epub.Compile(path);
return(PhysicalFile(path, ".epub".GetContentType(), $"{Input.DC.Title}.epub"));
}