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POMVVMLight Combobox Binding Silverlight4
 

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  1. POMVVMLight Combobox Binding Silverlight4
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    <p>(MVVM Light in SL4)</p> <p>My DisplayWorkOrder view has a field named WAREHOUSE_CODE. In my ViewModel, I bind to that property. If I use a textbox and set my Text="{Binding WAREHOUSE_CODE}", then open an existing WorkOrder, my textbox is populated with the value of WAREHOUSE_CODE (e.g. Lombard). If I change the textbox to a combobox, I have issues. </p> <p>The combobox is set up like so: </p> <pre><code>&lt;ComboBox Grid.Column="1" Grid.Row="1" x:Name="cboWarehouse" Margin="4" ItemsSource="{Binding Path=Warehouses}" SelectedValue="{Binding Path=WAREHOUSE_CODE, Mode=TwoWay}" /&gt; </code></pre> <p>My Warehouses property is simply (for design mode) a list that I build in the constructor of my ViewModel: </p> <pre><code>Warehouses = new List&lt;string&gt; { "Docks", "Pearl", "Lombard", "Powell", "Goose Hollow" }; </code></pre> <p>When I load a blank work order, my combobox is properly populated with this list. However, when I select an existing Work Order, my combobox is blank. Not only don't I display the selectedValue for that work order, but my ItemsSource doesn't seem to be binding anymore. </p> <p>As a sidenote, when I select an existing WorkOrder (via ChildWindow/Messaging), I overload the constructor in my view with this: </p> <pre><code>public DisplayWorkOrder(Model.BWorkOrder workOrder) { InitializeComponent(); this.DataContext = workOrder; } </code></pre> <p>If I set a breakpoint in here, workOrder.WAREHOUSE_CODE is set propertly, so I'm confused by what's happening. </p> <p>Any ideas? </p> <p><strong>EDIT for Stephan's comment</strong> So it makes sense that, by setting my DataContext to workOrder, I'm losing the context in my combobox that's set to my ViewModel. I WANT the datacontext to be set to to my ViewModel though. So currently I do this...</p> <p>In my ListWorkOrdersViewModel, after a user selects a work order to view, I use a RelayCommand (implementing iCommand interface) to send a message of type BWorkOrder, using a token "WOSelected". I also pass my object reference through the message. In my MainPage.xaml.cs (not proud of this, I need a messaging class to handle this stuff!), I subscribe to that code block:</p> <pre><code>Messenger.Default.Register&lt;NotificationMessage&lt;Model.BWorkOrder&gt;&gt;( this, nm =&gt; { if (nm.Notification == "WOSelected") { RightContent.Content = new Views.DisplayWorkOrder(nm.Content); } }); </code></pre> <p>So in this case, I'm setting the content property of my frame to an instantiated DisplayWorkOrder, overloading the constructor &amp; passing in my WO object. </p> <p>To keep the datacontext of my DisplayWorkOrderView to its ViewModel (instead of setting it to the workOrder object), I would have a property in my DisplayWorkOrderViewmOdel of type BWorkOrder, send my message from ListWorkOrderviewModel to DisplayWorkOrderViewModel, and set my workOrder object equal to the property (of type BWorkOrder), then bind the datacontext of my DisplayWorkOrder to that property? </p> <p>Hope that wasn't too confusing :) </p>
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    1. USScott Silvi
    1. USScott Silvi
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      1. POMVVMLight Combobox Binding Silverlight4
      1. USArief
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    1. COHave you tried to set a breakpoint in the "get" of the Warehouses property collection, to see if your collection is "get" when you open an existing WorkOrder?
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      1. POMVVMLight Combobox Binding Silverlight4
      1. USHyLian
    2. COWhat class is your Warehouses property in? Is it in `BWorkOrder`? If it's not in BWorkOrder then setting the DataContext to a workOrder will break the binding.
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      1. POMVVMLight Combobox Binding Silverlight4
      1. USStephan
    3. COSorry guys I got slammed by a deadline. HyLian - my get of my collection is not called when I open an existing WorkOrder. Stephan, my Warehouses property is in my ViewModel. It makes sense, what you're saying. I think, at this point, I need to have a Warehouses property in bWorkOrder that's of type List or ObservableCollection. I'm not sure how to implement though (I get errors in my attempt. Will add new reply for code formatting.
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      1. POMVVMLight Combobox Binding Silverlight4
      1. USScott Silvi
 

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