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複合式 LINQ.

技术2022-05-11  0


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近日開始寫有關於LINQ的文章,

正巧寫到Linq To SQL,由於探索LINQ的核心概念所致,

腦中突現一個想法,"我是否可以將LINQ to SQL用的Table與LINQ to XML的XElement join起來?"

理論上,在LINQ的設計概念中,這是可行的.

static void TestCrossLinq(){            NORTHWND db = new NORTHWND("Data Source=.//SQLEXPRESS;Initial Catalog=NORTHWND;Integrated Security=True");            XDocument doc = XDocument.Load("XMLFile1.xml");

            var p = from s1 in doc.Elements("tables").Elements("table").Descendants("row")                    join s2 in db.Customers on s1.Element("CUSTOMER_ID").Value equals s2.CustomerID                    where s1.Parent.Attribute("name") != null &&                          s1.Parent.Attribute("name").Value == "Orders"                    select new XElement("Order", s1.Nodes(), new XElement("CompanyName",s2.CompanyName));            foreach (var item in p)            {                foreach (var item3 in item.Elements())                {                    Console.WriteLine("{0} : {1}", item3.Name, item3.Value);                    Console.WriteLine("--------------------");                }            }            Console.ReadLine(); }

 

此程式由XML中讀出Order資訊,以其CUSTOMER_ID Element中的資料來與Linq To SQL中的Table : Customers join,取出CompanyName欄位放入結果集.

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