Databases Reference
In-Depth Information
LISTING 11.2
Modified Enumeration Field Template (Markup)
<%@ Control Language=”C#” CodeBehind=”Enumeration.ascx.cs”
Inherits=”WebApplication.DynamicData.FieldTemplates.EnumerationField” %>
<asp:Literal runat=”server” ID=”literal” Text=”
<%# FieldValueString %>”
/>
Overall, the implementation of the Enumeration field template becomes much simpler
because you are mostly removing unnecessary code. The new version of the code-behind
is shown in Listing 11.3.
LISTING 11.3
Modified Enumeration Field Template (Code-Behind)
using System.Web.UI;
using Unleashed.DynamicData;
namespace WebApplication.DynamicData.FieldTemplates
{
public partial class EnumerationField :
UnleashedEnumerationFieldTemplate
{
public override Control DataControl
{
get { return this.literal; }
}
}
}
Figure 11.5 shows how the modified version of the Enumeration field template looks on a
page; as you can see, the display name of the
EmployeeType
is shown, not its internal
(PascalCased) name.
FIGURE 11.5
Extended Enumeration field template.
Enum types help to reduce complexity of entity models and improve performance of the
application. This simple extension to the built-in Enumeration field templates to support
display name annotations eliminates one of the most common reasons why developers
introduce lookup tables in their applications. This allows you to take full advantage of
enums today and prepare for the upcoming 4.5 release of the Entity Framework where
you get first class support in both Entity Designer and LINQ to Entities.
