Always explicitly setting Proxy (even to null) prevents the use of the default system proxy.

[joekrill]

The Google and Microsoft providers are explicitly always setting the Proxy on the web request, even if it is null. Which makes it cumbersome to use the default system proxy. And it causes the requests to ignore it if you supply this in your .config:

<system.net> <defaultProxy enabled="true" useDefaultCredentials="true" /> </system.net>

Instead, consider:

if(this.Proxy != null) {
  request.Proxy = this.Proxy;
}

The MapQuest geocoder does this. The Yahoo Geocoder doesn't seem to support proxies at all. Not only that, the property should really be changed to an IWebProxy instead of WebProxy. Because even if I manually wanted to set the provider to use the default proxy, System.Net.WebRequest.DefaultWebProxy returns the interface (IWebProxy) and not the class (WebProxy).

[chadly]

Thanks, I changed them to IWebProxy and added it to the YahooGeocoder as well.