问完成CefSharp下载

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        if (downloadItem.IsComplete) {
            //do stuff
        }

    public class DownloadHandler : IDownloadHandler {

    public event EventHandler<DownloadItem> OnBeforeDownloadFired;
    public event EventHandler<DownloadItem> OnDownloadUpdatedFired;
    private bool stop;
    private DownloadWindow window;

    public void OnBeforeDownload(IBrowser browser, DownloadItem downloadItem, IBeforeDownloadCallback callback) {
        var handler = OnBeforeDownloadFired;
        if (handler != null) {
            handler(this, downloadItem);
        }

        if (!callback.IsDisposed) {
            using (callback) {
                callback.Continue(downloadItem.SuggestedFileName, showDialog: true);
            }
        }
        window = new DownloadWindow(downloadItem.TotalBytes, downloadItem.SuggestedFileName, this);
        window.Show();
    }

    public void OnDownloadUpdated(IBrowser browser, DownloadItem downloadItem, IDownloadItemCallback callback) {
        var handler = OnDownloadUpdatedFired;
        if (handler != null) {
            handler(this, downloadItem);
        }

        if (window != null) {
            window.UpdateProgress(downloadItem.ReceivedBytes);
        }

        if (stop) {
            callback.Cancel();
        }
    }

    public void StopDownload() {
        stop = true;
    }
}