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This article mainly introduces whether the XElement of LINQ to SQL Table and LINQ to XML can be join up, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to know about it.

Writing about Linq To SQL, as a result of exploring the core concepts of LINQ, a thought popped up in my mind, "can I combine LINQ to SQL Table with LINQ to XML's XElement join?"

In theory, this is feasible in LINQ's design concept.

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 ()

}

This program reads the Order information from XML, uses the data in its CUSTOMER_ID Element to communicate with Linq To SQL Table: Customers join, takes out the CompanyName field and puts it into the result set.

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