SharePoint Url in Webpart with Alternate Acess mapping

I have deployed my web part to a SharePoint environment having alternate accessing mapping configured. The public Url is https://sharepoint.com and the internal url for the same is http://internal-sharepoint.com

On one button click, i need to redirect the url to the same page with some additional parameter in query string.

I tried with both SPcontext.Current.Web.Url and Page.Request.Url.ToString() and both of them seem to give me the internal Url rather than the mapped url.

So the sequence is User types in https://sharepoint.com, clicks on the button and开发者_开发知识库 gets redirected to http://internal-sharepoint.com?myparam=somthing. Rather i would expect it be https://sharepoint.com?myparam=somthing

Please let me know your thoughts.

Thanks

---

Did you add both urls as public URLs in Alternate Access mapping?

Regardless, Page.Request.Url should always return the exact url you're seeing in the browser..