Wpf textbox text binding not updating

The key question is why the text display does not update after Binding reads the bound value. If you try the code in the OP you should see what I mean although if it works on your system, then clearly something to do with my set up. I am trying to work out why that is. There is no need for datepicker to raise a propertychange event, as DataBinding performs the read after the write automatically.

In fact if you run the code you will see the get is called after the set. Agreed, the re-read will work for the control that triggered the update even without the PropertyChanged event. But any other binding to the same property won't notice that the value has changed. So it's not actually a good idea and no good design to omit the notification. You cannot always know and actually you don't need to know which and how many targets will consum your data source. I think I am beginning to understand what is the reason for the lack of update of the Text property.

It still can and will update the string property since a string cant be invalid, but when it updates the string it already knows: I am not having a valid date right know, I won't update the SelectedDate property, and I won't clear the invalid user input in order to let the user do his corrections.

It's the same thing when you bind a TextBox to an integer and you type in your name. The Binding gets invalid and the false input is kept inside the control in order to allow the user do the correction. So you believe that behaviour text not updating is by design - it certainly does look that way! Ask a question. Quick access.

Search related threads. Remove From My Forums. Answered by:. Archived Forums. I hope it will work. Posted Jan am Abhishek Sur.

If Aslam Iqbal answer dosen't work try setting the binding mode to two way. Something like:. Posted Jan am Dan Mos. I have tested that too.. Otherwise you should implement INotifyPropertyChanged in your view model. Regards, Vineeth. Posted Jan pm Vineeth P Joseph. Add your solution here. OK Paste as. Treat my content as plain text, not as HTML. Existing Members Sign in to your account.

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Privacy policy. This topic describes how to use the UpdateSourceTrigger property to control the timing of binding source updates. The topic uses the TextBox control as an example. The TextBox. This means if an application has a TextBox with a data-bound TextBox. Text property, the text you type into the TextBox does not update the source until the TextBox loses focus for instance, when you click away from the TextBox. If you want the source to be updated as you type, set the UpdateSourceTrigger of the binding to PropertyChanged.