wpf - DataBinding fails for a collection property of custom control -


I have user controls - say "controlbase" is the "certain items" property, which is a observation , where InheritedFromDO is a class inherited from "dependency object".
When I create a markup for a child, I want to start the "SomeItems" collection in the class of ControlBase , but in some way I can not use bindings in that markup, though in normal cases control Is a very common datacontax and compulsive work.

It looks like: 

  & lt; Local: controlbage ... & gt; & Lt; Local: ControlBase.SomeItems & gt; & Lt; SomeItem DepPropertyOne = {Binding ID} & lt ;! - Does not work here - & gt; / & Gt; & Lt; SomeItem DepPropertyOne = {Binding Name} & lt ;! - Does not work here - & gt; / & Gt; & Lt; Local: ControlBase.SomeItems & gt; & Lt; Grid & gt; & Lt; TextBlock Text = {Binding ID} & lt ;! - Works here - & gt; / & Gt; & Lt; / Grid & gt; & Lt; / Local: ControlBase & gt;

Output says:

System.Windows.Data error: 2: Can not control frameworkElement or FrameworkContentElement for target element. BindingExpression: Path = Id; DataItem = Null; Target element 'Some elements' (hashcode = 26965808); The target property is 'DepPropertyOne' (type 'object')

How does this work out any ideas?

That's because the items in the collection are not part of the logical tree if you want to work , Or sub-squares (e.g.,.) With such control for you.


Comments

Post a Comment

Popular posts from this blog

python - Overriding the save method in Django ModelForm -

I'm having trouble overriding a ModelForm save method. I get this error I'm: Exception type: TypeErier Exception Value: Save () found an unexpected keyword argument 'committed' My intentions include a form 3 fields Submit several values ​​for, then create an object for each combination of those areas, and to save each object file models.py class collarsult type (models.Model): id = model. AutoField (db_column = 'icontact_result_code_type_id', primary_key = true) callResult = models.ForeignKey ( 'CallResult', db_column = 'icontact_result_code_id') campaign = models.ForeignKey ( 'campaign', db_column = 'icampaign_id') CALLTYPE = models.ForeignKey ( 'CALLTYPE', db_column = 'icall_type_id') agent = models.BooleanField (db_column = 'bagent', default = true) teamLeader = models.BooleanField (db_column = 'bTeamLeader', default = true) active = models.BooleanField (db_column = Django.form...
Read more

html - CSS autoheight, but fit content to height of div -

I have a div in which there are three children- div in the left and middle div: float: left while true: float: true because it is my layout Actually will spoil, I've used ClearFix Hack: .cf {zoom: 1; }. Cf: First,. Cf: {content: ""; Display: Table; }. Cf: After {clear: both; } It still works, but I want to be the right div an indicator. So it should fill 100% of the parent unit of height. How can I complete this? PS is the full code: & Lt; / Div & gt; & Lt; Div class = "mobile_content" & gt; & Lt; H5 & gt; {{Data.titel}} & lt; / H5> & Lt; Table & gt; & Lt; TR & gt; & Lt; Th & gt; Komponist: & lt; / Th & gt; & Lt; TD & gt; {{Data.komponist}} & lt; / TD & gt; & Lt; / TR & gt; & Lt; TR & gt; & Lt; Th & gt; Instrument: & lt; / Th & gt; & Lt; TD & gt; {{Data.instrumente}} & lt; / TD & gt; & Lt; / TR & gt;...
Read more

qt - How to prevent QAudioInput from automatically boosting the master volume to 100%? -

I have been trying to use Qt5 multimedia to record audio with QAudioInput, however, when I see If QAudioInput is started, it increases the master volume of my sound device to 100%. How can I prevent QAudioInput from changing the master volume? My current development platform is Linux with PalsAdio (with flat audio disabled). How can I use QAudioInput : QAudioDeviceInfo device_info = QAudioDeviceInfo :: defaultInputDevice (); QAudio format format; Format.setSampleRate (44100); Format.setChannelCount (1); Format.setSampleSize (16); Format.setCodec ("Audio / PCM"); Format.setSampleType (QAudioFormat :: SignedInt); Format.setByteOrder (QAudioFormat :: LittleEndian); Std :: cout & lt; & Lt; Device_info.deviceName (). ToUtf8 (). ConstData () & lt; & Lt; Std :: endl; QAudioInput * default_device = new QAudioInput (device_info, format); QIODevice * default_io_device = default_device-> Start (); a QAudioInput.setVolume () method is not you I ...
Read more