Wpf textblock text binding not updating
The second Text Box uses the Lost Focus value, which is actually the default for a Text binding.It means that the source value will be updated each time the destination control loses focus.The funny empty curly braces is there for a reason. Otherwise the parser will complain about the curly braces in beginning of – .Sadly this technique of binding Text Block text to 2 different properties or more is not available in Silverlight.The song name and band name can be two different fields in your class.(BTW if you remember this song, then you are Awesome AND Old. You can use this technique to bind two or more values to the same Text Block.For that reason, I have added a button next to the Text Box, which will update the source value on demand.
Now can you try to do it in reverse, Write something (test values) into Text Box’s from the Bottom most Text Box, and going up to the Top Most one. I believe now you found out, that not the position of the Textbox that affects whether its changes are being applied back to the source or not, but in fact whether or not the Text Box is the last one to get your Changes.In the following example, the highlighted lines of code show that the As a result, the Text Block shows the same text (because the source changes) as the user enters text into the Text Box, as illustrated by the following screenshot of the sample: If you have a dialog or a user-editable form and you want to defer source updates until the user is finished editing the fields and clicks "OK", you can set the Update Source Trigger value of your bindings to Explicit, as in the following example: Note You can use the same technique for properties of other controls, but keep in mind that most other properties have a default Update Source Trigger value of Property Changed.For more information, see the Update Source Trigger property page.In the previous article we saw how changes in a Text Box was not immediately sent back to the source.Instead, the source was updated only after focus was lost on the Text Box.