linq to xml 分组
需求就是取每个分组中的第一条数据

[解决办法]

C# code

string siteMap = HttpContext.Current.Request.MapPath("Test.xml");XDoc = XDocument.Load(siteMap);var thispage = from page in XDoc.Descendants("SitePage")               where page.Element("Title").Value.ToLower().Contains(strSearchTerm)        group page by page.Element("Category").Value into g orderby g.Count() descendingselect page.Element("Title").Value;
[解决办法]
最好把需求说的明白些，别人才好为你更好的解答..
给你一个按照多列分组的例子，希望对你有帮助.
C# code
XDocument doc = XDocument.Load("test.xml");            var groups =                from product in doc.Root.Elements("product")                group product by new { cId = (string)product.Element("categoryId"), sId = (string)product.Element("supplierId") } into g                select new { g.Key, g };            foreach (var group in groups)            {                Console.WriteLine("Category id: {0}; supplier id: {1}:", group.Key.cId, group.Key.sId);                foreach (var p in group.g)                {                    Console.WriteLine("\tProduct id: {0}", (string)p.Element("productId"));                }                Console.WriteLine();            }            Console.ReadLine();
[解决办法]
C# code
var result = from x in list group x by x.key into groups select new { groups.key, groups.FirstOrDefault() };