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POCO Entities Through RIA Services

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10 Dec 2010CPOL11 min read 48.9K   1.1K   29  
This article demonstrates how to generate plain old class objects (POCO) from the Entity Framework v4 (EF4) and use them through RIA Services in SilverLight version 4.
using System;
using System.ComponentModel;
using System.Data.Objects.DataClasses;
using System.Web.UI;

namespace BasicDataViewer.DynamicData.FieldTemplates
{
    public partial class ManyToManyField : System.Web.DynamicData.FieldTemplateUserControl
    {
        protected override void OnDataBinding(EventArgs e)
        {
            base.OnDataBinding(e);

            object entity;
            ICustomTypeDescriptor rowDescriptor = Row as ICustomTypeDescriptor;
            if (rowDescriptor != null)
            {
                // Get the real entity from the wrapper
                entity = rowDescriptor.GetPropertyOwner(null);
            }
            else
            {
                entity = Row;
            }

            // Get the collection and make sure it's loaded
            RelatedEnd entityCollection = Column.EntityTypeProperty.GetValue(entity, null) as RelatedEnd;
            if (entityCollection == null)
            {
                throw new InvalidOperationException(String.Format("The ManyToMany template does not support the collection type of the '{0}' column on the '{1}' table.", Column.Name, Table.Name));
            }
            if (!entityCollection.IsLoaded)
            {
                entityCollection.Load();
            }

            // Bind the repeater to the list of children entities
            Repeater1.DataSource = entityCollection;
            Repeater1.DataBind();
        }

        public override Control DataControl
        {
            get
            {
                return Repeater1;
            }
        }

    }
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


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