datetime converter WPF

Question

I have this converter that i made to get the current time once the date is selected from the DataPicker. In string Date i am getting the value that was selected from the DatePicker, but i cant seem to only get the date. The format that is coming into the Value property is 9/24/2013 12:00:00 I would like it to be 9/24/2013

the error i am getting is "Error 122 No overload for method 'ToString' takes 1 argument"

public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
            if (value is DateTime)
            {
            string date = value.ToString("d/M/yyyy");
            return (date);
            }

             return string.Empty;
}

Are you sure you don't get this error message somewhere else? http://msdn.microsoft.com/en-us/library/zdtaw1bw.aspx Or are you using .Net Framework 1.0 ? — Soner Gönül, Sep 05 '13 at 14:16

score 4 · Accepted Answer · edited Jun 28 '16 at 14:41

4

You need to cast it to DateTime first:

public object Convert(object value, Type targetType, object parameter,
                      System.Globalization.CultureInfo culture)
{
    if (value is DateTime)
    {
        DateTime test = (DateTime) value;
        string date = test.ToString("d/M/yyyy");
        return date;
    }

    return string.Empty;
}

edited Jun 28 '16 at 14:41

marbel82

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answered Sep 05 '13 at 14:17

Harsh

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1

But the if-condition will be satisfied ONLY if its DateTime Why should it be typecasted? – Nithin Nayagam Sep 05 '13 at 14:24
1

@NithinNayagam It can be an object type that derives from DateTime. – gitsitgo Sep 05 '13 at 14:47
when i try this i get 'Specified cast is not valid' – Robert Sep 05 '13 at 14:59

score 1 · Answer 2 · edited Apr 14 '16 at 12:01

1

You should cast value to DateTime type, because there is not a ToString(String f) method for the type of Object.

if (value is DateTime)
{
   var dateTime = (DateTime)value;
   return dateTime.ToString("dd/MM/yyyy");
}

return string.Empty;

edited Apr 14 '16 at 12:01

Jamie Rees

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answered Sep 05 '13 at 14:15

Dzmitry Martavoi

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This won't compile, since DateTime is a value type and cannot be cast with the as keyword. – Dr. Andrew Burnett-Thompson Sep 05 '13 at 14:24

ttsushko · Answer 3 · 2013-09-05T14:24:55.793

0

After check on type of value you need cast it to appropriate type, to be able to perform "ToString" call with format parameter. Try:

if (value is DateTime)
{
    var dateValue = value as DateTime;
    string date = dateValue.ToString("dd/MM/yyyy");
    return date; 
}

edited Sep 05 '13 at 14:24

answered Sep 05 '13 at 14:15

ttsushko

21
2

you shouldn't use `is` operator. it will be very slowly coz. it equivalent to two-times casting in your case. – Dzmitry Martavoi Sep 05 '13 at 14:19
Actually yes, but i wrote answer that fits to author's convert function. In addition it is not good practice to write functions that accept 'object' as parameter and returns also object. – ttsushko Sep 05 '13 at 14:23
this is implementation of http://msdn.microsoft.com/en-us/library/system.windows.data.ivalueconverter.aspx – Dzmitry Martavoi Sep 05 '13 at 14:25

score 0 · Answer 4 · edited May 23 '17 at 12:13

If you are using a Converter on a WPF DatePicker control, you should note that the WPF DatePicker will itself reformat the date despite the converter that you use. You will have to style the Datepicker to include a StringFormat.

There is a related question here: how to show just Month Year string format in a DatePicker which shows an attached property to modify the behaviour of DatePicker to display a custom format. This is needed because of a deficiency in the WPF Datepicker control itself.

Also note there are some caveats, notably the DatePicker will flicker between its default stringformat and the one you apply! I answered in the above question a workaround for to apply a custom Format to WPF Datepicker without the flicker.

Hope you find the solution you are looking for.

score -2 · Answer 5 · edited Apr 14 '16 at 20:00

-2

public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
    if (value is DateTime)
    {
        string date=value.Date.ToShortDateString();
        return (date);
    }

    return string.Empty;
}

edited Apr 14 '16 at 20:00

Wai Ha Lee

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answered Sep 05 '13 at 14:14

Nithin Nayagam

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datetime converter WPF

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