如何将实体集合传递给.NET RIA数据服务？

public class MyEntity
{
    public int Id { get; set; }
    public string Name { get; set; }
    // 其他属性
}

[EnableClientAccess]
public class MyDataService : DomainService
{
    public IEnumerable<MyEntity> GetMyEntities()
    {
        // 从数据源获取实体集合
        return entities;
    }
}

MyDataContext context = new MyDataContext(new Uri("http://localhost:port/MyDataService.svc", UriKind.Absolute));
var query = context.GetMyEntitiesQuery();
query.BeginExecute(OnQueryCompleted, query);

private void OnQueryCompleted(IAsyncResult result)
{
    var query = result.AsyncState as EntityQuery<MyEntity>;
    var entities = query.EndExecute(result);
    // 处理实体集合
}