c# - 具有 POST 方法和参数的 BackgroundTransferService

Question

我想上传文件 (VideoFile) 到服务器通过 BackgroundTransferService。

我的问题是，我还想与文件(POST 请求)一起发送 2 个参数。

那么，在使用 BackgroundTransferService API 时是否可以随文件上传一起发送参数..？

使用 BackgroundTransferService 编写代码:

        BackgroundTransferRequest req = new BackgroundTransferRequest(new Uri("ServerURL", UriKind.Absolute));
        req.Method = "POST";
        req.TransferPreferences = TransferPreferences.AllowCellularAndBattery;

        string uploadLocationPath = "/Shared/Transfers/myVideoFile.mp4";
        string downloadLocationPath = "/Shared/Transfers/response.txt";

        req.UploadLocation = new Uri(uploadLocationPath, UriKind.Relative);
        req.DownloadLocation = new Uri(downloadLocationPath, UriKind.Relative);

        req.TransferProgressChanged += req_TransferProgressChanged;
        req.TransferStatusChanged += req_TransferStatusChanged;

        try
        {
            BackgroundTransferService.Add(req);
        }
        catch (Exception ex)
        {
            MessageBox.Show("Unable to add video to upload queue.\nPlease try again later.", App.appName, MessageBoxButton.OK);
        }

请询问是否有人需要更多信息但无法理解我的问题。

我想要快速回复。是或否.. 如果是，那么如何..？

Answer 1

几周前我遇到了类似的问题。我以某种方式通过 HttpClient 管理了这个文件上传。

检查代码

        HttpClient client = new HttpClient();
        StorageFile file = null; // assign your file here

        MultipartFormDataContent formdata = new MultipartFormDataContent();
        formdata.Add(new StringContent("value"), "key");
        formdata.Add(new StreamContent(await file.OpenStreamForReadAsync()), "file", "recordedVideoFile2.mp4");

        var response = await client.PostAsync(new Uri("URL here"), formdata);