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Default date value 01/01/001

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DateTimePicker
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Robin
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Robin asked on 09 Sep 2010, 02:18 PM
Hi,

Im binding the RadDatePicker to a viewModel dateTime property. when the propert is null i get 01/01/001. How to i change this behaviour to just leave the date field blank. I thought about using the TargetNullValue property in binding but not sure what to target the value to? I tried 0 but that didnt work...?

<

 

 

telerik:RadDatePicker x:Name="rdActionDueDate" SelectedValue="{Binding actionDueDate, Mode=TwoWay, UpdateSourceTrigger=Explicit,TargetNullValue=0}" />

 

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Miroslav Nedyalkov
Telerik team
answered on 09 Sep 2010, 02:41 PM
Hi Chris,

 The type of the SelectedValue property of the DateTimePicker control is DateTime? which means it can have null value. If the corresponding property of your ViewModel is of type DateTime, this causes the problem. You can fix it either by changing the type of the property of your ViewModel or by providing a value converter to the binding where to handle the situation.

If you have further questions, don't hesitate to ask!

Best wishes,
Miroslav Nedyalkov
the Telerik team
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Robin
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answered on 09 Sep 2010, 04:33 PM
Hi there. thanks for the quick reply.

Happy to change out the property but not sure what I should be changing this too? Do you have any further information you could provide on this.

Thanks in advance
Chris
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Miroslav Nedyalkov
Telerik team
answered on 10 Sep 2010, 08:57 AM
Hi Chris,

 What you need to do is to change the type of the actionDueDate property from DateTime to DateTime? as the type of the SelectedValue of the RadDateTimePicker control is DateTime?.

Let us know if you have further questions.

Sincerely yours,
Miroslav Nedyalkov
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Robin
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answered on 10 Sep 2010, 10:13 AM
Hi There,

That worked, thanks very much for your help :)

Chris
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David
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answered on 18 Feb 2014, 03:00 PM
I'm figuring out how to deal with the converter. I don't want that for any reason there appears a 1/1/0001 nor 1/1/0001 12:00 AM 

In case you cant change the ViewModel's type you can try this converter:


public class EditDateConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        if (value != null && value.GetType().FullName == "System.DateTime")
        {
            var dt2 = (DateTime)value;
            if (dt2 != DateTime.MinValue)
                return value;
        }
        DateTime dt;
        if (!DateTime.TryParse(value as string, CultureInfo.InvariantCulture, DateTimeStyles.AssumeLocal, out dt))
            return dt != DateTime.MinValue ? value : null;
        return dt;
    }
    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        if (value == null && targetType.FullName == "System.DateTime")
            return DateTime.MinValue;
        return value;
    }
 }
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Robin
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Miroslav Nedyalkov
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Robin
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David
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