RestSharp DownloadData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");
}

我写这样的想法,但我现在不知道是什么？

Answer 1

我认为更好的替代方法是覆盖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);
}

其中HikFileStream是:

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!
    }

}