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POValidation for DateTime property in viewmodel
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  1. POValidation for DateTime property in viewmodel
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    copied!<p>I have a DateTime property (say, DateVal) in my viewmodel class and a DatePicker control in View.</p> <pre><code> &lt;DatePicker Grid.Column="1" Width="100" Height="30" SelectedDate="{Binding DateVal,ValidatesOnDataErrors=True}"/&gt; </code></pre> <p>Problem is that, if the user deletes the date displayed in textbox of Datepicker control ,DateVal property is not changing its value. How can I track that the user has removed the Date displayed in datepicker textbox? regards, Anirban</p> <p>The Date picker control looks like the following <img src="https://i.stack.imgur.com/RTKQG.jpg" alt="Date picker before editing date picker text box "> Now if the user just removes the date displayed in date picker text box, the control looks like the following <img src="https://i.stack.imgur.com/AWdKi.jpg" alt="Date picker after editing date picker text box"> At that point of time value of DateVal is same as before. Only when the user clicks on the calender icon Date is assigned a value null. How can I track the change at the same time when the user makes the text box empty ?</p> <p>ViewModel Code</p> <pre><code>public DateTime? DateVal { get { return this.dateVal; } set { this.dateVal = value; this.OnPropertyChanged("DateVal"); } } </code></pre> <p>xaml code</p> <pre><code>&lt;DatePicker Name="datePickerDateVal" Grid.Column="1" Width="100" Height="30" SelectedDate="{Binding DateVal,ValidatesOnDataErrors=True}" Text="{Binding DateVal,ValidatesOnDataErrors=True,UpdateSourceTrigger=PropertyChanged}" /&gt; </code></pre> <p>I want that the setter property of DateVal must be called when the user clears the Date Picker text box</p>
 

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