Get absolute URL to listitem's default display form

Question

I need to have an absolute URL of a listitem's display form - currently I do it the following way:

On http://example.com/:

item.ParentList.ParentWeb.Url.TrimEnd('/') //"http://example.com"
+ "/" 
+ item.ParentList.DefaultDisplayFormUrl.Trim('/')//"Lists/WorkflowTasks/DispForm.aspx"
+ "?ID=" + item.ID //"?ID=1"

This gets me the correct URL, meaning http://example.com/Lists/WorkflowTasks/DispForm.aspx?ID=1.

However this fails when my site collection is on a slightly more sophisticated host url, for example http://example.com/sites/secondsite/ - both methods from my code return the url containing the "/sites/secondsite/ part so I end up with http://example.com/sites/secondsite/sites/secondsite/Lists/etc...

How do I code it in a more reliable way?

Answer 1

There are a couple of methods for this available in the object model without the need to handle the slashes etc yourself, one method using MakeFullUrl:

var fullUrl = item.ParentList.ParentWeb.Site.MakeFullUrl(item.ParentList.DefaultDisplayFormUrl);

Parameters

strUrl

Type: System.String

A string that specifies the server-relative URL.

Return value Type: System.String

A string that contains the full URL.

Answer 2

var parentWebUrl = item.ParentList.ParentWebUrl;
var displayFormUrl = item.ParentList.DefaultDisplayFormUrl;
var itemIdQuery = "?ID=" + item.ID;
var fullUrl = parentWeblUrl.EndWith('/') ? parentWebUrl + displayFormUrl + itemIdQuery : 
                                           parentWebUrl + "/" + displayFormUrl + itemIdQuery

Answer 3

Just shut down my VM and hence can't test but how about using something like SPContext.Current.Web.Url in combination with SPList.DefaultDisplayFormUrl. Note that SPWeb.Url gets the absolute URL for the website.