WPF seems unrecognized and causes errors [duplicate]

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WPF <Border> seems unrecognized and causes errors [duplicate]



This question already has an answer here:



I am new in C# but was a programmer many years ago. I have "played" and searched a lot to understand what's wrong here:


<Window x:Class="WpfApp1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:WpfApp1"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800" Margin="0">
<Grid>
<Border> <-- any time this is here
<Grid.Resources> <-- this gets XLS0415 + XDG0012
...
</Grid.Resources>
<Grid.RowDefinitions> <-- this gets XLS0415 + XDG0012
...
</Grid.RowDefinitions>
<Border> <-- any time this is here
<Grid.ColumnDefinitions> <-- this gets XLS0415 + XDG0012
...
</Grid.ColumnDefinitions>
<Grid.RowDefinitions> <-- this gets XLS0415 + XDG0012
...
</Grid.RowDefinitions>
</Border>
</Grid>
</Border>
</Grid>
</Window>



Where:

XLS0415 = The attachable property 'Resources' was not found in type 'Grid'.

XDG0012 = The member "Resources" is not recognized or is not accessible.


and same for RowDefinitions and ColumnDefinitions.


XLS0415 = The attachable property 'Resources' was not found in type 'Grid'.


XDG0012 = The member "Resources" is not recognized or is not accessible.


RowDefinitions


ColumnDefinitions



It seems only InteliSense recognizes <Border>, while the XAML interpreter (or whatever it's called?) DOES NOT.


I've tried moving / modifying the <Border> statements in any way I could think of, cut&pasted 3 working examples - always with the same (or similar) problems


<Border>


<Border>



This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.





While it does not answer my question directly, it DOES show how to do what I wanted, as I now understand this is not an issue about <Border>, but basic knowledge about <Grid>s . That's why my searches didn't come across it, though I DID find at least 3 places showing <Border> right AFTER `<Grid> opening statement, not BEFORE. If this is a reason to damage my reputation, I hope I become more worthy someday :) Thanks and sorry.
– Itay1
Aug 12 at 10:46



<Border>


<Grid>


<Border>





@Itay1, It is not specific to Border or Grid, it is XAML rule of property tag syntax: elementTypeName.propertyName. see the link to MS docs which I posted under the answer
– ASh
Aug 12 at 13:52



elementTypeName.propertyName




1 Answer
1



<Grid.Resources> and <Grid.RowDefinitions> tags state that Resources and RowDefintions are being added to Grid. Therefore <Grid.Resources> and <Grid.RowDefinitions> properties can be nested only inside <Grid> tag. After you defined those properties, define nested children element[s] like <Border>


<Grid.Resources>


<Grid.RowDefinitions>


<Grid.Resources>


<Grid.RowDefinitions>


<Grid>


<Border>


<Window x:Class="WpfApp1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:WpfApp1"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800" Margin="0">
<Grid>
<Grid.Resources>
...
</Grid.Resources>
<Grid.RowDefinitions>
...
</Grid.RowDefinitions>
<Border>
<Grid>
<Grid.ColumnDefinitions>
...
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
...
</Grid.RowDefinitions>
<Border>

</Border>
</Grid>
</Border>
</Grid>
</Window>





Wow, It works! Thanks for the solution & explanantion! <br> I ran across lots of examples placing <Border> immediately INSIDE <Grid>, and none immediately OUTSIDE of it. I wonder how all of them did not fail, as they did when I merely cut&pasted them?!
– Itay1
Aug 12 at 10:53


<Border>


<Grid>





@Itay1, I recomment to take a look at MS docs here: XAML syntax in detail. if my answer helped, please mark it as accepted
– ASh
Aug 12 at 13:51





Thanks @ASh. I tried reading it and remembered why I quit programming and became a product designer 25 years ago, and 8 years later became a psychotherapist. I am now an <Amateur reputation="2"/> and you are helping me understand that is where I want to stay. :))
– Itay1
Aug 12 at 14:34



<Amateur reputation="2"/>

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