Update resource in Xaml from code

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I have created a resource in XAML like this:

HTML

<window.resources>
    <!--Opretter Agents objekt-->
    <local:agents x:key="AgentsList" xmlns:x="#unknown" xmlns:local="#unknown" />
</window.resources>

Now I wish to "update" that resource.
I wish to load from a XML file, and then make the resource use "agents".

C#

agents = FindResource("AgentsList") as Agents;
agents = AgentsXmlSerializer.DeSerialize();

so I want the window resource

HTML

<local:agents x:key="AgentsList" xmlns:x="#unknown" xmlns:local="#unknown" />

to use the agents I just deserialized

C#

agents = AgentsXmlSerializer.DeSerialize();

how do I do this?

Posted 6-Oct-11 7:29am

ErikSvendsen

Updated 6-Oct-11 8:49am

v2

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Simon Bang Terkildsen · Accepted Answer · 2011-10-06T10:41:00

Solution 1

You'll have to remove the existing resource and then add the new object to the resources

C#

Resources.Remove("AgentsList");
Resources.Add("AgentsList", agents);

I don't understand why you would want to do this, but no matter what you're trying to achieve I'm sure you could do it in a much better way.
Also remember if you refer to the resource with StaticResource then what you do will have no effect, using DynamicResource might but not necessarily have the effect you're trying to achieve.

Posted 6-Oct-11 10:41am

Simon Bang Terkildsen

Comments

ErikSvendsen 6-Oct-11 16:46pm

Hi Simon Bang.
Thanks for your answer.

I am new to WPF, so I don't really know where to place the object creation yet. Would it simply be better to place it all in code?

There is no way to update a resource?
I know Resources.Update("AgentsList") doesn't exist, but something like it?!

If no, then I will accept your solution

Simon Bang Terkildsen 6-Oct-11 16:49pm

well you can also write Resources["AgentsList"] = agents, but the effect is exactly the same as the two lines I posted in the solution.

ErikSvendsen 6-Oct-11 16:52pm

So if I use Resources["AgentsList"] = agents, and bind it with DynamicResource it will work as an update?

Simon Bang Terkildsen 6-Oct-11 16:53pm

Most likely, but resources isn't supposed to be used like that, so it really depends on what you're trying to do.

ErikSvendsen 6-Oct-11 17:05pm

Okay. Thank you very much.
Since it goes beyond the scope of the question I do not really expect you to answer.
But why is resources not supposed to be used like that?

I am trying to do nothing more than my code shows. It is an exercise given by my teacher. I know how to do it in code, but I was interested in the XAML/Code part

Simon Bang Terkildsen 6-Oct-11 17:06pm

Resources are supposed to define the visual appearance of your application, you would define brushes, styles, data templates and the like as resources, and these would only change if the user changed the theme of the application.

What you seem to be doing is to do a binding without using a binding, seems silly to me, I'm guessing your teacher is getting you to do something awkward now and then later get you to do it the right way, at least I hope that's the case.

ErikSvendsen 6-Oct-11 17:10pm

Thank you for the clarification :)
My teacher only gives the assignment, not the way to do it.
I am trying remaking the exercise I already made, but I am trying to have more focus on XAML in the remake, so it is my own "experiment"

Simon Bang Terkildsen 6-Oct-11 17:13pm

Ah ok, I don't what topics has been covered in your class, but seems to me that you should have a look at data bindings, here is a CP article: WPF Data Binding - Part 1

ErikSvendsen 6-Oct-11 17:13pm

Thanks :)

Espen Harlinn 6-Oct-11 17:46pm

A solid effort, my 5 :)

Simon Bang Terkildsen 6-Oct-11 18:22pm

Thank you, Espen