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POMVVM with webservice
 

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    <p>I'm going to do a wpf application using MVVM(It based on <a href="http://www.codeproject.com/KB/WPF/MVVMQuickTutorial.aspx" rel="nofollow noreferrer">http://www.codeproject.com/KB/WPF/MVVMQuickTutorial.aspx</a> ). </p> <p>This application will be connecting with webservice one per month.</p> <p>On webservice I have contract </p> <pre><code>public class Student { public string Name {get; set;} public int Score {get; set;} public DateTime TimeAdded {get; set;} public string Comment {get; set;} } </code></pre> <p>In WPF application Adding, and removing students will be saving to xml file.</p> <p>So at wpf application Student would be something like :</p> <pre><code>public class Student { public string Name {get; set;} public int Score {get; set;} public DateTime TimeAdded {get; set;} public string Comment {get; set;} public Student(string Name, int Score, DateTime TimeAdded, string Comment) { this.Name = Name; this.Score = Score; this.TimeAdded = TimeAdded; this.Comment = Comment; } } public class StudentsModel: ObservableCollection&lt;Student&gt; { private static object _threadLock = new Object(); private static StudentsModel current = null; public static StudentsModel Current { get { lock (_threadLock) if (current == null) current = new StudentsModel(); return current; } } private StudentsModel() { // Getting student s from xml } } public void AddAStudent(String Name, int Score, DateTime TimeAdded, string Comment) { Student aNewStudent = new Student(Name, Score, TimeAdded, Comment); Add(aNewStudent); } } </code></pre> <p>How connect this two classes ?</p> <p>The worst think I guess is that contract Student from webservice would be use in this wpf application to get students from xml, in other application collection of studetns would be getting from database.</p> <p>I'm newbie in design patterns so it is very hard for me :/</p> <p>Example: I click AddUser, and in application A it calls webservice method which adding user to database, in application B it adds user to XML file, and In application. Base class are contracts at webservice.</p> <p>Next explanation:</p> <p>First application uses webservice to save data at database. Second application never save data in xmls and one perm month send this xmls to webservice and convert their to intances of students and save it at database</p>
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    1. COA couple of things. The fact that you have a webservice is completely unrelated to most of the rest of your question. If you need the same object to store to both an XML file and a webservice, look at the DTO/DAO design pattern in Java.
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      1. USMerlyn Morgan-Graham
    2. COThe MVVM design pattern is designed to designed to keep your UI separate from the business logic/data. Your logic lies in the Model (DataModel) classes, and the UI implementation lies in the ViewModel classes. Ideally, you could throw out the UI and DataModel, build another view, and the rest of the logic would work just fine, without changes. The UI talks to the ViewModel via WPF databinding, and commands, and the ViewModel talks to the DataModel directly via code. That's the MVVM design pattern.
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    3. COAlso, the question "How connect this two classes ?" isn't really a question. It could be re-formed as "please implement this for me".
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