如何在.NET WebBrowser控件中阻止下载？

document.addEventListener('DOMContentLoaded', function () {
    var links = document.getElementsByTagName('a');
    for (var i = 0; i< links.length; i++) {
        links[i].addEventListener('click', function (e) {
            e.preventDefault();
        });
    }
});

private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
    webBrowser1.Document.InvokeScript("eval", new object[] { "document.addEventListener('DOMContentLoaded', function () { var links = document.getElementsByTagName('a'); for (var i = 0; i< links.length; i++) { links[i].addEventListener('click', function (e) { e.preventDefault(); }); } });" });
}