How to get the Absolute URL of a file in sharepoint library

Question

I am working on SharePoint 2010.I have an documentlibrary ID and document ID in that library with me.i don't have either web,site in which the document library is present.So now I have to get the Full URL of the document at runtime.How can I get it . I have tried the following.

string filepath = currentList.DefaultViewUrl + "/" + sListItem.Url;

Please answer this.

Answer 1

Use the field "EncodedAbsUrl" on the SPListItem. Works for SPFile as well:

SPListItem item = ...;
string absUrl = (string) item[SPBuiltInFieldId.EncodedAbsUrl];

or for a SPFile

 SPFile file = ...;
 string absUrl = (string) file.Item[SPBuiltInFieldId.EncodedAbsUrl];

Answer 2

The built in field id is for sure the best way to go but it returns the Url as encoded which may or may not be what you want.

I think the best way is to add a little extension method to a utilities class somewhere:

public static string AbsoluteUrl(this SPFile File, bool Decode = true)
{
    string EncodedUrl = File.Item[SPBuiltInFieldId.EncodedAbsUrl].ToString();
    if (Decode)
        return SPEncode.UrlDecodeAsUrl(EncodedUrl);
    else
        return EncodedUrl;
}

And then call as follows

Item.File.AbsoluteUrl();

if you want a decoded Url or

Item.File.AbsoluteUrl(false);

if you want the Url to remain encoded.

Note that the default parameter value for Decode will only be available in .Net4+ and therefore SP2013 only but you can easily create an overload method for SP2010. You'll also need a reference to Microsoft.SharePoint.Utilities namespace to access the SPEncode class.