RestSharp 下载数据与进度条同步

Question

如何在窗体应用程序中通过 ProgressBar 下载文件并显示下载进度？

RestClient client = new RestClient("http://127.0.0.1/");

RestRequest request = new RestRequest("/test/{FileName}");
request.AddParameter("FileName", "testFile.abc", ParameterType.UrlSegment);

string path = @"C:/Users/[user]/Desktop/testFile.abc";

var fileForDownload = client.DownloadData(request);

fileForDownload.SaveAs(path);

if (File.Exists(@"C:/Users/[user]/Desktop/testFile.abc"))
{
    MessageBox.Show("done");
}

我写了一些这样的想法，但我不知道现在是什么？

Answer 1

我认为更好的选择是覆盖 FileStream 以获取写入文件的字节数：

string tempFile = Path.Combine(Configuration.DownloadFolder, "TEST.DATA");
using (var writer = new HikFileStream(tempFile))
{
    writer.Progress += (w, e) => {
#if DEBUG
        Console.Write(string.Format("\rProgress: {0} / {1:P2}", writer.CurrentSize, ((double)writer.CurrentSize) / finalFileSize));
#endif
    };
    request.ResponseWriter = (responseStream) => responseStream.CopyTo(writer);
    var response = client.DownloadData(request);
}

HikFileStream 在哪里：

class HikFileStream : FileStream
{
    public HikFileStream(string path)
        : base(path, FileMode.Create, FileAccess.Write, FileShare.None)
    {
    }

    public long CurrentSize { get; private set; }


    public event EventHandler Progress;

    public override void Write(byte[] array, int offset, int count)
    {
        base.Write(array, offset, count);
        CurrentSize += count;
        var h = Progress;
        if (h != null)
            h(this, EventArgs.Empty);//WARN: THIS SHOULD RETURNS ASAP!
    }

}

Answer 2

抱歉，您不能，因为 RestClient 中没有事件处理程序对象来获取下载数据的状态。

这是另一种方法；

        //...
        timer1.Interval = 1000; // 1 sec interval.

        timer1.Start();

        RestClient client = new RestClient("http://127.0.0.1/")
                            {
                                Timeout = 10 * 1000 //10 sec timeout time.
                            };

        RestRequest request = new RestRequest("/test/{FileName}");
        request.AddParameter("FileName", "testFile.abc", ParameterType.UrlSegment);

        string path = @"C:/Users/[user]/Desktop/testFile.abc";

        var fileForDownload = client.DownloadData(request);

        fileForDownload.SaveAs(path);

        if (File.Exists(@"C:/Users/[user]/Desktop/testFile.abc"))
        {
            MessageBox.Show("done");
        }

        progressBar1.Value = 100;
        timer1.Stop();
    }

    public void timer1_Tick(object sender, EventArgs e)
    {
        if (progressBar1.Value <= 100)
        {
            progressBar1.Value += 10;
        }

        if (progressBar1.Value >= 100)
        {
            progressBar1.Value = 0;
        }
    }

为命名最佳实践更改“timer1”的名称。祝你好运...