Validate invalid input on DateTimePicker

Question

I have a DateTimePicker as follows:

<UserControl
...
xmlns:xctk="http://schemas.xceed.com/wpf/xaml/toolkit"
...
>
     <xctk:DateTimePicker Name="MyDatePicker" 
           Value="{Binding MyDate, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}" 
           Format="Custom" FormatString="dd/MM/yyyy HH:mm:ss"                
           AutoCloseCalendar="True"/>

I'm using IDateErrorInfo on my data model to handle business logic errors; for example:

public class MyViewModel : IDataErrorInfo
{
    public string Error
    {
        get { return null; }
    }

    public string this[string columnName]
    {
        get
        {                
            string error = DataValid();
            CanExecute = (error == string.Empty);

            return error;
        }
    }

CanExecute is a property which manages whether the user can select to submit the data. This all works well, however, if I simply select the date and mash the keyboard (type random letters), the date is reset to 01/01/01. What I would like to happen is for the date to effectively remain unchanged (that is, as it was before I mashed the keyboard). However, I can't seem to find a place to handle the casting error which obviously is occurring when this happens.

How can I trap this?

(The DateTimePicker control is part of the WPF Extension Kit)

Sorry, yes I mean typing random characters; the control is from here: https://wpftoolkit.codeplex.com/wikipage?title=DateTimePicker&referringTitle=Documentation — Paul Michaels, Nov 13 '13 at 14:28

score 0 · Answer 1 · edited May 23 '17 at 12:12

0

If you don't like the way the control handles errors you can handle errors yourself in a subclass, an example of this in my old question Wpf Datepicker Input modification

edited May 23 '17 at 12:12

Community

1
1

answered Nov 13 '13 at 16:09

Tewr

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Validate invalid input on DateTimePicker

1 Answers1