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Fill ObservableCollection with database query

Posted on 2012-03-22
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Last Modified: 2013-11-12
I am using Silverlight 4 and SharePoint and want to fill an ObservableCollection from a returned dataset from SharePoint. I have the query and connection to SharePoint done. In my example my List is called _getList and my ListCollectionItems is called _getListItems. My query returns a dataset of x amount of rows of data from an Employee table.

How do I iterate through the returned dataset (_getListItems) and populate Silverlight's ObservableCollection so that I may perform binding and validation on the controls (i.e. textboxes, listboxes, comboboxes, etc.)?
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Question by:sr2007
3 Comments
 
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Expert Comment

by:ambience
ID: 37775346
Using untyped datasets?

Can you change the query to return an Observable collection instead? (if thats in your control)

Alternatively, you may have to create a model class and loop through returned rows to populate the observablecollection. This shouldn't be difficult, however two way binding may require sending updates back to the database?

Check this

http://social.expression.microsoft.com/Forums/en/blend/thread/3772bf00-06a2-466a-8a56-49ed8c5a471b

It shows how to fill a List, but can be changed to return an ObservableCollection instead.
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Accepted Solution

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Sathish DV earned 500 total points
ID: 37826917
Dear sr2007,

Since u already have List or ListCollectionItem with entire dataset collection, u can better include one extension method so the List will be returned as ObservableCollection type.

Below is extension method to convert List to Observable collection

public static class ExtensionMethods
    {
        public static ObservableCollection<T> ToObservableList<T>(this IEnumerable<T> data)
        {
            ObservableCollection<T> dataToReturn = new ObservableCollection<T>();

            foreach (T t in data)
                dataToReturn.Add(t);

            return dataToReturn;
        }
    }

So while returning List or ListCollection u can use the below code

Consider ur dataset returns Employee type....

public ObservableCollection<Employee> GetEmp()
{
      return getList.ToObservableList();
}

Let me know if you need any other information.

By doing this u need not to re-write most of the code... just create one Extension method and use it where ever needed.
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