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EnumObject Class
Download the EnumObject class used in this example.
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Posted by:
retro
Date:
10/02/2009
Category:
Web Development
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this article has been read 1427 times
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A while ago we posted an article that explained how to create a custom class to wrap enumerations so that their members can be accessed using a standard ObjectDataSource control and binded to a control such as a DropDownList. This relied on creating a separate method for each enumeration. Here we have just one method for any enumeration.
The original article can be viewed at http://www.retroviz.com/CMS/a79_Creating_custom_data_objects_using_enumerations.aspx
Instead of creating a method for each enumeration that you wish to retrieve, we can create a generic method and pass it the name of the type. The updated EnumObject class can be seen below:
<DataObjectAttribute()> _
Public Class EnumObject
Private _value As Integer
Private _name As String
Public Property Value() As Integer
Get
Return _value
End Get
Set(ByVal value As Integer)
_value = value
End Set
End Property
Public Property Name() As String
Get
Return _name
End Get
Set(ByVal value As String)
_name = value
End Set
End Property
Public Sub New()
End Sub
Public Sub New(ByVal value As Integer, ByVal name As String)
Me.Value = value
Me.Name = name
End Sub
''' <summary>
''' Returns the items in an enumeration ignoring "notset"/0
''' </summary>
''' <param name="enumName">The full name (including namespace) of the enumeration</param>
<DataObjectMethod(DataObjectMethodType.Select, False)> _
Public Shared Function GetEnumTypes(ByVal enumName As String) As List(Of EnumObject)
Dim recordset As New List(Of EnumObject)
Dim s As Type = Type.GetType(enumName)
Dim fi As FieldInfo() = s.GetFields
For Each f As FieldInfo In fi
If Not f.IsSpecialName AndAlso Not (f.Name.ToLower = "notset") Then
Dim myValue As Integer = CType(f.GetValue(0), Integer)
recordset.Add(New EnumObject(myValue, f.Name))
End If
Next
Return recordset
End Function
End Class
Then we create our ObjectDataSource we just pass the full name of our type (including any namespaces):
<asp:ObjectDataSource runat="server" ID="objMaintenanceType" SelectMethod="GetEnumTypes"
TypeName="MyApp.BLL.EnumObject">
<SelectParameters>
<asp:Parameter DefaultValue="MyApp.BLL.MaintenanceType" Name="enumName"
Type="String" />
</SelectParameters>
</asp:ObjectDataSource>
and bind a data control to it like below:
<asp:DropDownList runat="server" ID="ddlMaintenanceType" AutoPostBack="True" DataSourceID="objMaintenanceType"
DataTextField="Name" DataValueField="Value">
It's as simple as that.
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