sharepoint Working with Managed Server Side Object Model (full-trust) Get list by url
Example
using (SPSite site = new SPSite("http://server/sites/siteCollection"))
using (SPWeb web = site.OpenWeb())
{
string listUrl = string.Format("{0}{1}", web.ServerRelativeUrl, "Lists/SomeList");
SPList list = web.GetList(listUrl);
}
