WPF Data Validation - Exception, IDataErrorInfo, ValidationRule, & Annotations

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In this video we cover creating dat validation in multiples of ways. 1) By throwing an exception, 2) By using the IDataErrorInfo interface, 3)By using custom ValidationRule base class, and 4) By using the System.ComponentModel.Annotations.
I was going to break this video in to multiple parts, but decided to keep it as one video. I advise taking a break half way through if you have a short attention span like me ;)
Link the the GitHub project - github.com/Tosker/ValidationI...
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Опубликовано:

15 июн 2024

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Комментарии : 41

@richardkerr2009 3 года назад

Great explanation and with different implementations - I've ended up using a combination of these to fit the needs of my view. Thanks for taking time to put these videos together.

@pk2068 5 лет назад

well done. Simple, short, clear. No fuss, no wasting time. Tip to the point. And also your english is understandable.

@anrodse 4 года назад

Great explanation! Thank you so much. BTW: Thanks for the Ctrl+. tip. I knew it was possible but I didn't know the combination.

@talkathiriify 5 лет назад

Thank you very much for all your video series

@nandinik7816 2 года назад

Finally found a good video on validation. Thank you

@hanimajali7581 2 года назад

Great Video... I like the annotation because it is like what I use in MVC. Thank you!

@appspointco941 2 года назад

Great explanation! Thank you so much.

@longuinni 5 лет назад

Really nice. I'm learning a lot from you. Keep going, you have a valuable content here.

@domeanterai 5 лет назад

annotation more simple & clean I think.. good video .. Thanks

@hazemelamir2083 4 года назад

many thanks for your valuable tutorial

@ivandrofly Год назад

10:09 I think binding the tooltip directly with the dictionary will throw an exception when there is no error on the property - you only show when there are errors. Ps: There is also another interface for validation INotifyOnDataErrroInfo which I think is also very powerful

@oussamasethoum2755 3 года назад

Thank you very much, this is very educative

@vinuhosanagar1 5 лет назад

Thanks much for your tutorials. We need more and more from you :)

@ToskersCorner 5 лет назад

How was the video quality? I just recently realized I had been recording with a downscale to 720p, so in this video I changed to 1080p. Not sure if the extra file size is worth it or not.

@vinuhosanagar1 5 лет назад

ToskersCorner video quality is nice. However getting 720p only

@freddyflares2757 5 лет назад

I prefer the IDataErrorInfo interface, but an issue in all cases is if you have a Textbox backed by a numeric property with a OneWayToSource binding and the user enters an invalid string. It's not easy to communicate that back to the ViewModel in a Command's CanExecute handler for example. What I did was make a custom ValueConverter that TryParses the string to an int or -1 if error and treat -1 as an invalid value.

@dhruvpanchal9010 3 года назад

Great Explanation !

@sashabelyy7528 2 года назад

14:02 If you wanna property validates on start need set ValidationRule property ValidatesOnTargetUpdate="True". In this case 13:50 need write:

@PaulCuenin 4 года назад

very helpful. Thanks

@sergiotardo 4 года назад

Excelent video!!!! thanks

@andresreloir4076 5 лет назад

How would you implement a default validation when using the IDataErrorInfo interface? I would like to avoid a giant switch statement.

@surfsoul8660 3 года назад

Nice video. I have a little question when I tried the ValidationByDataAnnotation method, Unable to cast object of type 'System.Int32' to type 'System.Array' gave me this error, what have I done wrong?

@daled3502 4 года назад

Are you able to demo the validation being triggered by a button press....

@hamarasansarharsh 5 лет назад

which one is best performance wise?

@solvedplus858 3 года назад

very cool but how can we bind error collection in ex2 to the error template in ex3?

@gundolflinda8434 4 года назад

Using the IDataErrorInfo approach together with an ErrorTemplate with seems to work. Am I right that ErrorCollection won't be necessary in this case?

@nemethistvan1892 5 лет назад

How can i set the MinimumCharacters field from source code (the value is 5 in the 14:29 picture in the video). I want to set the rule's value from a value what was read out from an xml file at startup. I can't solve this huge problem, and it is quite urgent for me. Thanks in advance.

@yeagor541 Год назад

Is there any possibility to also bind button enable/disable status with textblock changing?

@DoctorMGL Год назад

any way to manage ( *value could not be converted* ) Error message ? that is fired by ( idataErrorinfo )

@Gazcan Год назад

How can I display the error message in the textbox when using exceptions?

@billymumby9821 5 лет назад

How would you get access to a validation errors in example 3 in your viewmodel?

@ToskersCorner 5 лет назад

Can you timestamp that spot to which you are referring?

@joshualatusia4858 4 года назад

@@ToskersCorner I think he means example 3 which starts at 10:39 - The minimum character rule.

@Danger418 5 лет назад

Is it possible to disable/enable Submit button based on these validation errors?

@Trust_Me_Im_An_Engineer 4 года назад

Try using a multivalue converter for multiple input fields and then handling the logic inside of the converter.

@erikjansen9149 4 года назад

ErrorCollection will keep old messages. Where do you clear the collection?

@gundolflinda8434 4 года назад

I firstly thought so aswell. But everytime that "name" validates successfully (i.e. result == null after value of name get checked) we still assign result ( = null ) to ErrorCollection[name], therefore resetting its error message.

@suriyadexter9674 4 года назад

How to do it in the combo box??

@lawkaijian618 Год назад

Why my OnPropertyChanged got error at IDataErrorInfo?Please help!

@joshuasafabre1202 5 лет назад

just thinking. how to clear TextBox After submitting.

@Danger418 5 лет назад

Well the simple way of doing it would be to set the TextBox.Text property to empty in your submit Click Event. Something like this: private void btnSubmit_Click(object sender, RoutedEventArgs e) { txbUsername.Text = ""; }