/// <summary>
/// 已经存在物理文件，添加媒体文件信息。
/// </summary>
/// <param name="storage">物理文件存储信息。</param>
/// <param name="extension">扩展名。</param>
/// <param name="title">标题。</param>
/// <param name="isUnique">判断每个物理文件和媒体文件信息是否一一对应。</param>
/// <param name="mediaType">媒体类型。</param>
/// <param name="targetId">所属实例Id。</param>
/// <param name="directoryId">文件目录Id。</param>
/// <returns>返回当前文件的访问地址，如果失败返回<c>null</c>。</returns>
private async Task <string> CreateAsync(StorageFileInfo storage, string extension, string title, bool isUnique, string mediaType, int targetId, int directoryId)
{
var mediaFile = await _repository.FindAsync(m => m.FileId == storage.FileId);
if (mediaFile != null && isUnique)
{
return(mediaFile.Url);
}
if (string.IsNullOrWhiteSpace(extension))
{
extension = ".png";
}
mediaFile = new MediaFileInfo();
mediaFile.Id = Guid.NewGuid();
mediaFile.Extension = extension;
mediaFile.Type = mediaType;
mediaFile.TargetId = targetId;
mediaFile.DirectoryId = directoryId;
mediaFile.Length = storage.Length;
mediaFile.FileId = storage.FileId;
mediaFile.Title = title;
if (await _repository.CreateAsync(mediaFile))
{
return(mediaFile.Url);
}
return(null);
}
/// <summary>
/// 从临时文件中的文件全新添加文件信息。
/// </summary>
/// <param name="path">临时文件的物理路径。</param>
/// <param name="md5">文件Md5值。</param>
/// <param name="extension">扩展名称。</param>
/// <param name="title">标题。</param>
/// <param name="contentType">内容类型。</param>
/// <param name="length">大小。</param>
/// <param name="mediaType">媒体类型。</param>
/// <param name="targetId">所属实例Id。</param>
/// <param name="directoryId">文件目录Id。</param>
/// <param name="mediaId">媒体文件的Id。</param>
/// <returns>返回当前文件的访问地址，如果失败返回<c>null</c>。</returns>
private async Task <string> CreateAsync(string path, string md5, string extension, string title, string contentType, long length, string mediaType, int targetId, int directoryId, Guid?mediaId = null)
{
var storage = new StorageFileInfo();
var mediaFile = new MediaFileInfo();
mediaFile.Id = mediaId ?? Guid.NewGuid();
if (await _repository.BeginTransactionAsync(async db =>
{
var storages = db.As <StorageFileInfo>();
storage.Name = md5;
storage.Length = length;
storage.ContentType = contentType ?? ContentType.GetContentType(extension);
if (await storages.CreateAsync(storage))
{
mediaFile.Title = title;
mediaFile.Extension = extension;
mediaFile.Type = mediaType;
mediaFile.TargetId = targetId;
mediaFile.DirectoryId = directoryId;
mediaFile.Length = length;
mediaFile.FileId = storage.FileId;
return(await db.CreateAsync(mediaFile));
}
return(false);
}))
{
StoredFile(path, storage);
return(mediaFile.Url);
}
File.Delete(path);
return(null);
}
private void StoredFile(string path, StorageFileInfo storage)
{
var mediaPath = GetMediaPath(storage);
if (File.Exists(mediaPath))
{//文件已经存在，但是数据库重建就会出现重复文件的事情
File.Delete(path);
return;
}
var dir = Path.GetDirectoryName(mediaPath);
if (!Directory.Exists(dir))
{
Directory.CreateDirectory(dir);
}
File.Move(path, mediaPath);
}
/// <summary>
/// 上传一个新的文件替换原来的物理文件。
/// </summary>
/// <param name="mediaFile">媒体文件实例对象。</param>
/// <param name="path">临时文件物理路径。</param>
/// <param name="file">表单文件实例对象。</param>
/// <returns>返回文件的访问地址，如果不成功则返回<c>null</c>。</returns>
private async Task <string> CreateAsync(MediaFileInfo mediaFile, string path, IFormFile file)
{
var md5 = Md5(path);
var storage = await _storages.FindAsync(s => s.Name == md5);
if (storage != null)
{
mediaFile.FileId = storage.FileId;
mediaFile.Length = storage.Length;
if (await _repository.UpdateAsync(f => f.Id == mediaFile.Id, new { mediaFile.Length, mediaFile.FileId }))
{
return(mediaFile.Url);
}
return(null);
}
storage = new StorageFileInfo();
if (await _repository.BeginTransactionAsync(async db =>
{
var storages = db.As <StorageFileInfo>();
storage.Name = md5;
storage.Length = file.Length;
storage.ContentType = file.ContentType;
if (await storages.CreateAsync(storage))
{
mediaFile.Length = file.Length;
mediaFile.FileId = storage.FileId;
return(await db.UpdateAsync(f => f.Id == mediaFile.Id, new { mediaFile.Length, mediaFile.FileId }));
}
return(false);
}))
{
StoredFile(path, storage);
return(mediaFile.Url);
}
File.Delete(path);
return(null);
}
private string GetMediaPath(StorageFileInfo storage)
{
return(Path.Combine(_mediaRootPath, storage.Path));
}
