wpf获取webbroswer的两个方法

//跳转前的地址
private void WebBrowser_BeforeNavigate2(object pDisp, ref object URL, ref object Flags, ref object TargetFrameName, ref object PostData, ref object Headers, ref bool Cancel)
        {
            String strUri = (URL == null ? "Null" : URL.ToString());
            MessageBox.Show("post" + strUri);
        }

XAML代码: 
<WebBrowser x:Name="browser"/>

C#代码:

browser.Navigated += new NavigatedEventHandler(browser_Navigated); 
browser.Navigate(new Uri("http://www.microsoft.com"));

//省略...

void browser_Navigated(object sender, NavigationEventArgs e) 
{ 
　　string url=e.Uri.ToString();//这里是broswer的url
}