/// <summary>
/// 处理下载文件块
/// </summary>
/// <param name="message">消息</param>
/// <param name="fileName">下载文件名</param>
/// <param name="chunkNumber">块号</param>
/// <returns>文件块信息</returns>
async Task <FileChunkInfo> IFileGrain.DownloadFileChunk(string message, string fileName, int chunkNumber)
{
if (chunkNumber <= 0)
{
return(null);
}
string sourcePath = Path.Combine(DownloadPath, fileName);
if (!File.Exists(sourcePath))
{
throw new InvalidOperationException(String.Format("不存在下载文件: {0}", fileName));
}
await using (FileStream sourceStream = new FileStream(sourcePath, FileMode.Open, FileAccess.Read, FileShare.Read))
{
FileChunkInfo result = await FileChunkInfo.CreateAsync(sourceStream, fileName, chunkNumber, MaxChunkSize);
if (result.Done && _service != null)
{
await _service.AfterDownloadFile(message, sourcePath);
}
return(result);
}
}