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POSilverlight 3/Prism - Passing an enum value as a Command Parameter
 

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  1. POSilverlight 3/Prism - Passing an enum value as a Command Parameter
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    <p>I'm trying to use Prism and the MVVM pattern to develop an application. In my UI, I have a previous and next button defined. For use in a calling web services, I've defined an enum that will tell me the direction I need to traverse. So, in this instance, the buttons map directly to an enum value. The enum definition is very simple and is as follows:</p> <pre><code>namespace CodeExpert.Book.Helpers { public enum BookDirection { Previous = -1, NotSet = 0, Next = 1, } } </code></pre> <p>I've defined my command and delegate in my ViewModel and assigned the propery correctly. The relevant code is:</p> <pre><code>public DelegateCommand PreviousNextCommand { get; set; } public IndexEntriesViewModel(GlobalVariables globalVariable, IndexEntryOperations currentOperator) { //a bunch of initialization code. InitializeCommands(); } void InitializeCommands() { PreviousNextCommand = new DelegateCommand(OnPreviousNextCommandExecute); } private void OnPreviousNextCommandExecute(BookDirection parameter) { //Code to process based on BookDirection } </code></pre> <p>So, based on this config, I want to pass a BookDirection enum value to the CommandParameter. I can't, however, get the XAML right for this. Here's the XAML I've tried that seems the most correct to me:</p> <pre><code>&lt;UserControl xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" x:Class="CodeExpert.Book.Views.Index" d:DesignWidth="1024" d:DesignHeight="768" xmlns:helpers="clr-namespace:CodeExpert.Book.Helpers" xmlns:command="clr-namespace:Microsoft.Practices.Composite.Presentation.Commands;assembly=Microsoft.Practices.Composite.Presentation" xmlns:common="clr-namespace:System.Windows;assembly=System.Windows.Controls" xmlns:controls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls" xmlns:vsm="clr-namespace:System.Windows;assembly=System.Windows" xmlns:input="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Input"&gt; &lt;Button x:Name="ButtonPrevious" HorizontalAlignment="Left" Margin="2,1,0,1" Width="25" Content="&lt;" Grid.Column="1" Grid.Row="1" Height="20" command:Click.Command="{Binding Path=CurrentIndexViewModel.PreviousNextCommand}"&gt; &lt;command:Click.CommandParameter&gt; &lt;helpers:BookDirection.Previous /&gt; &lt;/command:Click.CommandParameter&gt; &lt;/Button&gt; &lt;/UserControl&gt; </code></pre> <p>I get no intellisense for the BookDirection for the enum and get an error at design &amp; compile time saying The type 'BookDirection' does not contain adefinition for 'Previous'. Is there no way to pass that enum, or am I simply missing something? I have it working now by setting the parameter type to <code>string</code> instead of <code>BookDirection</code>, but then I have to parse text and the code smells. I've done some Google searches and the closest thing I've come to an answer is here - <a href="https://stackoverflow.com/questions/359699/passing-an-enum-value-as-command-parameter-from-xaml">Passing an enum value as command parameter from XAML</a> Unfortunately, Silverlight doesn't support the x:static binding extension, so I can't use the exact technique described in that answer.</p> <p>Any help would be much appreciated.</p>
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