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POLINQ to SQL Attaching collection of object from XML file Database
 

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    <p>I am developing an HRM application to import and export xml data from database. The application receives exported xml data for the employee entry. I imported the xml file using linq to xml, where I converted the xml into respective objects. Then I want to attach (update) the employee objects.</p> <p>I tried to use</p> <pre><code>//linqoper class for importing xml data and converts into IEnumerable employees object. var emp = linqoper.importxml(filename.xml); Using (EmployeedataContext db = new EmployeedatContext){ db.attachAllonSubmit(emp); db.submitchange(); } </code></pre> <p>But I got error <code>“An entity can only be attached as modified without original state if it declares as version member or doesn't have an update check policy”</code>.</p> <p>I have also an option to retrieve each employee, and assign value to the new employee from xml data using this format.</p> <pre><code>//import IEnumerable of Employee objects var employees = = linqoper.importxml(filename.xml) using(Employeedatacontext db = new Employeedatacontext){ foreach(var empobj in employees) { Employee emp = db.Employee.where(m=&gt;m.id==empobj.Id); emp.FirstName=empobj.FirstName; emp.BirthDate=empobj.BirthDate; //….continue } db.submitChanges(); } </code></pre> <p>But the problem with the above is I have to iterate through the whole employee objects, which is very tiresome. So is there any other way, I could attach (update) the employee entity in the database using LINQ to SQL.</p> <p>I have seen some similar links on SO, but none of them seems to help.</p> <p><a href="https://stackoverflow.com/questions/898267/linq-to-sql-attach-refresh-entity-object/%22https://stackoverflow.com/questions/898267/linq-to-sql-attach-refresh-entity-object%22">https://stackoverflow.com/questions/898267/linq-to-sql-attach-refresh-entity-object</a></p>
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