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POValidation in WPF DataGrid not working
 

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  1. POValidation in WPF DataGrid not working
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    <p>I'm tryin to get properties on a ViewModel validated in the DataGrid, but I'm running into a problem.</p> <p>My XAML code looks like this:</p> <pre><code>&lt;DataGrid x:Name="Items"&gt; &lt;DataGrid.Columns&gt; &lt;DataGridTextColumn Binding="{Binding Quantity}" Header="Quantity" /&gt; &lt;/DataGrid.Columns&gt; &lt;/DataGrid&gt; </code></pre> <p>The ViewModel-objects in the Items-collection (based on the Caliburn.Micro Screen-class) has a property that looks like this:</p> <pre><code>public int Quantity { get { return Section.Quantity; } set { Section.Quantity = value; } } </code></pre> <p>This works great! If I enter "abc" in the cell where a Quantity should be, a red line is drawn around the textbox to indicate an error.</p> <p>However I want to be able to manipulate the Quantity value a litle, so I'd like to use this code instead:</p> <pre><code>public string Quantity { get { return string.Format("{0} pcs.", Section.Quantity); } set { var quantityAsText = value.Replace("pcs.", string.Empty).Trim(); int quantity; if (int.TryParse(quantityAsText, out quantity)) { Section.Quantity = quantity; NotifyOfPropertyChange(() =&gt; Quantity); } else { throw new FormatException("Quantity must be a number!"); } } } </code></pre> <p>However this doesn't work. The FormatException is never caught and my app crashes...</p> <p>I've tried modifying the binding to this without any positive result:</p> <pre><code>Binding="{Binding Quantity, Mode=TwoWay, ValidatesOnExceptions=True}" </code></pre> <p>Any ideas?</p>
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    1. USKenneth Kryger Sørensen
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    1. COI'd either use a converter to take care of this kind of thing, or I'd just drop it. How much effort do you want to spend worrying about people who try to type in "pcs."?
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      1. USWill
    2. COMy example is greatly simplified, so it isn't really just "pcs." text I'm worried about, which I - in hindsight - maybe should have made clear. I just created this example to keep things simple.
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      1. USKenneth Kryger Sørensen
    3. COWell, anyhow, this is what converters are for. A similar situation is in the Properties window for a UIElement. You have a Width and Height property. They take doubles, which represent pixels, but in the Property editor you can enter a size in inches (11 in), which gets coverted to pixels.
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      1. USWill
 

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