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POBinding to double field with validation
 

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    <p>I'm trying to bind <code>TextBox</code> to <code>double</code> property of some object with <code>UpdateSourceTrigger=PropertyChanged</code>. The goal is to immediately during editing validate entered value to be in allowed range (and display an error if not). I want to implement validation on Model level, i.e. via <code>IDataErrorInfo</code>.</p> <p>All works great when I bind to int property, but if property is double then a frustrating editing behavior appears: after erasing last significant digit in fractional part of number - the decimal separator is automatically erased (with all possible fractional zeroes). For example, after erasing digit '3' from number '12.03' the text is changed to '12' instead of '12.0'.</p> <p>Please, help.</p> <p>Here is the sample code:</p> <p>MainWindow.xaml:</p> <pre><code>&lt;Window x:Class="BindWithValidation.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="80" Width="200" WindowStartupLocation="CenterOwner"&gt; &lt;StackPanel&gt; &lt;TextBox Width="100" Margin="10" Text="{Binding DoubleField, UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}"&gt; &lt;TextBox.Style&gt; &lt;Style TargetType="TextBox"&gt; &lt;Style.Triggers&gt; &lt;Trigger Property="Validation.HasError" Value="true"&gt; &lt;Setter Property="ToolTip" Value="{Binding RelativeSource={RelativeSource Self}, Path=(Validation.Errors)[0].ErrorContent}"/&gt; &lt;/Trigger&gt; &lt;/Style.Triggers&gt; &lt;/Style&gt; &lt;/TextBox.Style&gt; &lt;/TextBox&gt; &lt;/StackPanel&gt; &lt;/Window&gt; </code></pre> <p>MainWindow.xaml.cs:</p> <pre><code>namespace BindWithValidation { public partial class MainWindow : Window { private UISimpleData _uiData = new UISimpleData(); public MainWindow() { InitializeComponent(); DataContext = _uiData; } } } </code></pre> <p>UISimpleData.cs:</p> <pre><code>namespace BindWithValidation { public class UISimpleData : INotifyPropertyChanged, IDataErrorInfo { private double _doubleField = 12.03; public double DoubleField { get { return _doubleField; } set { if (_doubleField == value) return; _doubleField = value; RaisePropertyChanged("DoubleField"); } } public string this[string propertyName] { get { string validationResult = null; switch (propertyName) { case "DoubleField": { if (DoubleField &lt; 2 || DoubleField &gt; 5) validationResult = "DoubleField is out of range"; break; } default: throw new ApplicationException("Unknown Property being validated on UIData"); } return validationResult; } } public string Error { get { return "not implemented"; } } public event PropertyChangedEventHandler PropertyChanged; protected void RaisePropertyChanged(string property) { if ( PropertyChanged != null ) PropertyChanged(this, new PropertyChangedEventArgs(property)); } } } </code></pre>
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    1. COI'd imagine this is to do with formatting - since 12 is equivalent to 12.00, have you tried using StringFormat on binding?
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    2. COYes, I've tried, but don't like how editing works with it. StringFormat is good for presenting, but during editing I would like to avoid it.
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