/// <summary>
/// 删除已上传的文件
/// </summary>
public async Task <bool> DeleteFile()
{
if (State != FileItemState.None || string.IsNullOrEmpty(ID))
{
Kit.Warn("当前状态不允许删除文件！");
return(false);
}
bool suc = await AtFile.Delete(ID);
if (suc)
{
_owner.AfterDeleteItem(this);
}
else
{
Kit.Warn("删除文件失败！");
}
return(suc);
}
/// <summary>
/// 执行下载
/// </summary>
/// <param name="p_priorThumbnail">是否优先下载缩略图</param>
/// <param name="p_prompt">是否提示下载失败信息</param>
/// <returns></returns>
internal async Task <bool> Download(bool p_priorThumbnail = false, bool p_prompt = true)
{
if (State != FileItemState.None || string.IsNullOrEmpty(ID))
{
if (p_prompt)
{
Kit.Warn("当前状态不可下载！");
}
return(false);
}
bool downloadThumb = false;
if (p_priorThumbnail)
{
// 优先下载缩略图时，先判断是否存在
downloadThumb = await AtFile.Exists(ID + ThumbPostfix);
// 缩略图不存在时，若为视频文件不下载
if (!downloadThumb && FileType != FileItemType.Image)
{
return(false);
}
}
string path = Path.Combine(Kit.CachePath, downloadThumb ? GetThumbName() : GetFileName());
FileStream stream = null;
try
{
if (System.IO.File.Exists(path))
{
System.IO.File.Delete(path);
}
stream = System.IO.File.Create(path);
}
catch (Exception ex)
{
if (p_prompt)
{
Kit.Warn("创建文件出错！");
}
Log.Error(ex, "下载前创建文件出错！");
return(false);
}
State = FileItemState.Downloading;
DownloadInfo info = new DownloadInfo
{
Path = downloadThumb ? ID + ThumbPostfix : ID,
TgtStream = stream,
Progress = OnDownloadProgress,
};
bool suc = false;
_ctsDownload?.Dispose();
_ctsDownload = new CancellationTokenSource();
try
{
suc = await Downloader.GetFile(info, _ctsDownload.Token);
}
catch (Exception ex)
{
Log.Error(ex, "下载出错");
}
finally
{
_ctsDownload?.Dispose();
info.TgtStream.Close();
State = FileItemState.None;
}
if (!suc)
{
if (p_prompt)
{
Kit.Warn(info.Error);
}
// 未成功，删除缓存文件，避免打开时出错
try
{
// mono中 FileInfo 的 Exists 状态不同步！
if (System.IO.File.Exists(path))
{
System.IO.File.Delete(path);
}
}
catch { }
}
else
{
VisualStateManager.GoToState(this, "Cached", true);
}
return(suc);
}
/// <summary>
/// 上传成功后
/// </summary>
/// <param name="p_id">文件上传路径</param>
/// <param name="p_file">已上传文件对象</param>
/// <returns></returns>
async Task IUploadUI.UploadSuccess(string p_id, FileData p_file)
{
// 更新时删除旧文件
if (!string.IsNullOrEmpty(ID))
{
// 删除服务器端旧文件
await AtFile.Delete(ID);
// 删除本地旧文件
Kit.DeleteCacheFile(GetFileName());
}
ID = p_id;
// 若文件已在CachePath，重命名免去再次下载，如录音、拍照、录视频等临时文件已在CachePath
string filePath = p_file.FilePath;
#if UWP
// 为安全访问ID
if (filePath.StartsWith("{"))
{
try
{
var file = await StorageApplicationPermissions.FutureAccessList.GetFileAsync(filePath);
filePath = file.Path;
}
catch { }
}
#endif
if (filePath.StartsWith(Kit.CachePath))
{
try
{
FileInfo fi = new FileInfo(filePath);
if (fi.Exists)
{
// 重命名免去再次下载
string newPath = Path.Combine(Kit.CachePath, GetFileName());
fi.MoveTo(newPath);
UpdateCachedFlag();
}
}
catch { }
}
// 缩略图重命名
if (!string.IsNullOrEmpty(p_file.ThumbPath))
{
try
{
FileInfo fi = new FileInfo(p_file.ThumbPath);
if (fi.Exists)
{
string newPath = Path.Combine(Kit.CachePath, GetThumbName());
fi.MoveTo(newPath);
}
}
catch { }
}
}