CrossListQueryInfo in SharePoint

                  
The CrossListQueryInfo object uses the CrossListQueryInfo object to get the cached results or, if there are no cached results available, it performs a cross-list query to the database and then caches the results for future use.


      CrossListQueryInfo clqi = new CrossListQueryInfo();
                        clqi.Query = "<OrderBy><FieldRef Ascending=\"FALSE\" Name=\"Title\" /></OrderBy><Where><BeginsWith><FieldRef Name=\"Title\" /><Value Type=\"Text\">Test</Value></BeginsWith></Where>";
                        clqi.ViewFields = "<FieldRef Name=\"Title\" /><FieldRef Name=\"ContentType\" />";
                        clqi.Lists = "<Lists BaseType=\"1\" />";
                        clqi.Webs = "<Webs Scope=\"SiteCollection\" />";
                        clqi.UseCache = true;

                        CrossListQueryCache clqc = new CrossListQueryCache(clqi);
                        DataTable tbl = clqc.GetSiteData(osite, CrossListQueryCache.ContextUrl());
                        GridView1.DataSource = tbl;

                        GridView1.DataBind();


Note :

CrossListQueryCache Routine

Uses Cache
GetSiteData (SPSite)
Yes
GetSiteData (SPWeb)
No
GetSiteData (SPSite, String)
Yes
GetSiteData (SPWeb, SPSiteDataQuery)
No

hope this will helps you...

Happy Coding...

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