Paste XML as Classes Missing In Visual Studio

Just wanted to pass along a quick tip for working with the Paste Special features in Visual Studio.  You may be aware that Visual Studio has options for generating classes based on XML and JSON under the Edit, Paste Special menu.

Paste Special

The Paste Special menu and options in Visual Studio 2013.

These options will generate VB.NET or C# classes that work with the built-in .NET serialization libraries.  However, you may only see the option to “Paste JSON as Classes” from the menu in your Visual Studio window.  This is because XML option is only available in projects targeting .NET Framework 4.5 and above.  Change your project’s target framework version and the option will become available.

If you are not able to upgrade your project, you could always create a new .NET 4.5 project, generate the classes there and then copy them to the destination.  You may need to correct some version specific errors, but this option will still get you most of the way there.

Iterating Over an Enumerable – Creating a “Days of the Week” Drop Down Menu

Enumerations are extremely valuable for managing sets of numeric values such as status codes or days of the week.  Most of the time, you would create an enumerable to simplify values used in multiple points that have the same representation, in order to improve the readability and re-usability of your code.  However, there are some situations where using the enumeration’s name and value directly on the presentation layer can make sense.

For example, let’s say we have a form where we need the user needs to choose a day of the week to assign to a particular record.  We can easily generate a drop down list of values using the built in DayOfWeek enum that is included by default in the System library.


Let’s create a Drop Down List on our page.  We will generate the list items in code behind, so we will just leave those blank.  It should look something like this:

<br />&lt;asp:DropDownList ID="ddlDay" runat="server"&gt;&lt;/asp:DropDownList&gt;<br />

In our code behind file, we will use a couple of helpers from the System.Enum namespace to allow us to loop through our enumerable’s values and get their names for use in the list item.  Here’s the code for our page load event:

<br />Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load<br /><%%KEEPWHITESPACE%%>    If Not Page.IsPostBack() Then<br /><%%KEEPWHITESPACE%%>        ' Get the values of the DayOfWeek Enum (0-6).<br /><%%KEEPWHITESPACE%%>        Dim daysOfTheWeek = System.Enum.GetValues(GetType(DayOfWeek))<br /><br /><%%KEEPWHITESPACE%%>        For Each value In daysOfTheWeek<br /><%%KEEPWHITESPACE%%>            ' Get the name that corresponds to each value.<br /><%%KEEPWHITESPACE%%>            Dim name = System.Enum.GetName(GetType(DayOfWeek), value)<br /><br /><%%KEEPWHITESPACE%%>            ' Add a new list item, using our name and value.<br /><%%KEEPWHITESPACE%%>            ddlDay.Items.Add(New ListItem(name, value))<br /><%%KEEPWHITESPACE%%>        Next<br /><%%KEEPWHITESPACE%%>    End If<br />End Sub<br />

It’s that simple.  Now you know that the value that gets posted back to the server will match directly with the values defined in the enumeration, even if the values were to change at a later date.

A Caveat

One thing to keep in mind are that this is only a user friendly option for single word names.  For example, if you have a value that represents a process’ status that is named “InProgress”, it would appear as a single word in the drop down as well.  You could parse the name to add the space, but there are cases where that could over complicate the process.

Thanks for reading!