Update a record in a database using WCF Data Services

I'm trying to use WCF Data Services and I'm a little confused about where I'm wrong in tr开发者_JAVA技巧ying to update a record, based on a key field value.

My simplified approach, which doesn't work:

 MydbEntities context = new MydbEntities(new Uri("http://localhost:53051/Services/MydbService.svc"));
 MyEntity avt = context.MyTable.Where(p => p.EntID == "val1").FirstOrDefault();
 avt.FieldToEdit = 1;
 context.UpdateObject(avt);
 context.BeginSaveChanges(OnChangesSaved, context);
 ...
 private void OnChangesSaved(IAsyncResult result)
 {            
     MessageBox.Show("seems ok");//I'm getting this message, but, in fact, data in db remains unchanged
 }

Please, tell me, where am I wrong?

---

I've found the cause of the problem. It was trivial (I feel like an idiot), there was no writing access rights set in the service initializer. There was the following:

public static void InitializeService(DataServiceConfiguration config)
{
    config.SetEntitySetAccessRule("*", EntitySetRights.AllRead);
      ...
}

after I changed it to:

config.SetEntitySetAccessRule("*", EntitySetRights.All);

all started to work as expected. And, of course, such a broad access rule I set only for testing purposes. Later it should be restricted.

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In your OnChangesSaved handler, you need to call context.EndSaveChanges(result).

This link has some sample code that illustrates the whole process.