Question

这是我下载文件的代码。但我不知道如何将文件写入磁盘。

private async Task DownloadFile()
    {
        HttpStreamContent streamContent = new HttpStreamContent(new SlowInputStream(streamLength));
        IProgress<HttpProgress> progress = new Progress<HttpProgress>(ShowProgress);
        response = await httpClient.PostAsync(new Uri(downloadUrl), streamContent).AsTask(cts.Token, progress);
    }

我不知道在这里写什么以及在哪里调用WriteToFile（）：

  private async Task WriteToFile()
    {
        var myFile = await KnownFolders.MusicLibrary.CreateFileAsync(filename.Replace("---", " - ")+".mp3", CreationCollisionOption.GenerateUniqueName);
///stuck here
    }

Answer 1

我这样做了：

private async Task DownloadFile()
    {

        IProgress<HttpProgress> progress = new Progress<HttpProgress>(ShowProgress);
        try
        {

            response = await httpClient.GetAsync(new Uri(downloadUrl), HttpCompletionOption.ResponseContentRead).AsTask(cts.Token, progress);
            DownloadMessageText.Text = "Download complete. Writing to disk...";
            await WriteToFile();
            DownloadMessageText.Text = "File saved in music library.";
        }
        catch { }


    }

并写入磁盘：

private async Task WriteToFile()
    {
        var myFile = await KnownFolders.MusicLibrary.CreateFileAsync(filename.Replace("---", " - ") + ".mp3", CreationCollisionOption.GenerateUniqueName);
        var fs = await myFile.OpenAsync(FileAccessMode.ReadWrite);
        IBuffer buffer = await response.Content.ReadAsBufferAsync();
        await fs.WriteAsync(buffer);
    }

如何将HttpStreamContent写入文件？

1 个答案: