Getting an object in resources by Key

Question

This should be a beginner's question to WPF but I can't find a simple answer. How do you get a handle on an object declared in WPF?

<Window x:Class="Testprj" xmlns:local="clr-namespace:Testprj">
    <Window.Resources>
        <local:CustomValidation x:Key="validationObj"/>
    </Window.Resources>
</Window>

If I'm not mistaken, the above code is creating an instance of a "CustomValidation" object with the key "validationObj". Now, say each "CustomValidation" object has an instance variable called "myInstanceVar", how can I get the value of myInstanceVar from the code behind?

What I'm trying to do is something like (pseudocode):

validationObj.myInstanceVar

But it's unable to find even "validationObj". Any ideas?

Are you asking how you can reference an object in C# code that was instantiated (created) in WPF ? — tatmanblue, Apr 09 '13 at 14:35

Steve · Accepted Answer · 2013-04-09T16:06:28.463

2

I believe you're asking how you can use that object from the code behind. I believe this.FindResource("validationObj") would do the trick.

var valObj = (CustomValidation)this.FindResource("validationObj");
var whatever = valObj.myInstanceVar;

edited Apr 09 '13 at 16:06

answered Apr 09 '13 at 14:38

Steve

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Note that you'll have to cast the result to CustomValidation to access myInstanceVar. – cunningdave Apr 09 '13 at 15:21
I added the typecast to my example. – Steve Apr 09 '13 at 16:06

score 0 · Answer 2 · edited May 23 '17 at 12:29

0

you ask how to access control declared in XAML in codebehind

use x:name

than use poo in your codebehind

http://msdn.microsoft.com/en-us/library/ms752290.aspx

generally you should not have a code behind and use the MVVM design pattern to avoid it.

this is a good place to start: MVVM: Tutorial from start to finish?

edited May 23 '17 at 12:29

Community

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answered Apr 09 '13 at 14:36

Nahum

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Getting an object in resources by Key

2 Answers2