WPF Discussion Boards

Re: Combobox Question - MVVM

8-Oct-10 18:43

This[^] thread how we can achieve this using Element binding and the selectedvalue.

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eddieangel11-Oct-10 9:14

eddieangel

11-Oct-10 9:14

Thanks for the link, it was not exactly what I was looking for but it did lead me to a lot of interesting reading. As it turns out, all I really needed to do was invoke the OnPropertyChanged event for my Subcategory Observeable collection to update the UI after updating the Category observeablecollection selected item.

Cheers, --EA

what is use of silverlight

deepak chaudhari snk8-Oct-10 1:16

deepak chaudhari snk

8-Oct-10 1:16

i am mca fresher student please give information about silverlight in asp.net

Mycroft Holmes8-Oct-10 1:22

8-Oct-10 1:22

Buy a book, read some articles, read some white papers, bloody hell do some research. With that attitude (ask someone to spoon feed you) I suggest a change of career/study.

Never underestimate the power of human stupidity
RAH

#realJSOP8-Oct-10 2:05

#realJSOP

8-Oct-10 2:05

It's a client-side web application, much like Flash.

.45 ACP - because shooting twice is just silly
-----
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"The staggering layers of obscenity in your statement make it a work of art on so many levels." - J. Jystad, 2001

Pete O'Hanlon8-Oct-10 2:31

8-Oct-10 2:31

The answer is in this[^] thread.

I have CDO, it's OCD with the letters in the right order; just as they ruddy well should be

Forgive your enemies - it messes with their heads

Abhinav S8-Oct-10 5:53

Download file from server on button click

8-Oct-10 5:53

You can always check out www.msdn.com.

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Run Exe on server

sumit70347-Oct-10 22:59

sumit7034

7-Oct-10 22:59

Hi I am using SilverLight. I want to run/execute an exe on server with passing some commandLine when user click on a button.

Please help.

Thanks in advance

Re: Run Exe on server

#realJSOP7-Oct-10 23:47

#realJSOP

7-Oct-10 23:47

You can try this blog entry (google is your friend):

http://www.xdevsoftware.com/blog/post/Run-Server-Side-Code-from-Silverlight-objects.aspx[^]

sumit70347-Oct-10 20:37

sumit7034

7-Oct-10 20:37

Hi I am working on silverlight
I have binded a list box with ItemsSource="{Binding LstStrings, Mode=OneWay}" and inside that I have a button for downloading file from server. Now in binding I have a path of file for download. Please help me how to Implement when user click on download button it start download the file from binding path corresponding in the list from the server.

Thanks

Re: Download file from server on button click

Abhinav S7-Oct-10 20:47

xaml - binding path - escape double quote

7-Oct-10 20:47

Use the WebClient class to download the file.
See here[^].

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devvvy7-Oct-10 16:38

devvvy

7-Oct-10 16:38

hello,

This is a question on how to escaoe "double quote" in a xaml - I tried different things suggested by here (but no luck)[^]

See below - I tried to reference a Cells["IsConfigurable"] column value but

<br />
                                                <Style x:Key="cColumnStyle" TargetType="{x:Type igDP:CellValuePresenter}"><br />
                                                        <Setter Property="Background" Value="LightGoldenRodYellow "></Setter><br />
                                                        <Style.Triggers><br />
                                                            <DataTrigger Binding="{Binding Path=Cells[&quot;IsConfigurable&quot;].Value}" Value="False"><br />
                                                                <Setter Property="IsEnabled" Value="False"/><br />
                                                            </DataTrigger><br />
                                                        </Style.Triggers><br />
                                                    </Style><br />

But keep getting error:

<br />
Error	2	Names and Values in a MarkupExtension cannot contain quotes. The MarkupExtension arguments ' Path=Cells["IsConfigurable"].Value}' are not valid. <br />

dev

Re: xaml - binding path - escape double quote

Abhinav S7-Oct-10 20:51

Re: xaml - binding path - escape double quote

7-Oct-10 20:51

devvvy wrote:
="{Binding Path=Cells["IsConfigurable"].Value}"

Try putting the above text in a single quote '.
Leave your double quotes - I've never tried that but its worth a shot.

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PumbaPumba13-Oct-10 9:33

PumbaPumba

13-Oct-10 9:33

This is in real mess. Why don't you use a Converter and do these operations there.

MVVM

eddieangel7-Oct-10 7:49

eddieangel

7-Oct-10 7:49

Is it acceptable from a MVVM standpoint to put form related (data independent) code in the code-behind file of the view?

Example:

private void RightButtonClick(object sender, RoutedEventArgs e)
{
    ListBoxPreview.SelectedIndex = ListBoxPreview.SelectedIndex + 1;
}

It is an agnostic function so I think it is alright but I am curious from a clinical standpoint what you guys think.

Cheers, --EA

Pete O'Hanlon7-Oct-10 11:49

7-Oct-10 11:49

One of the funny things about MVVM is that people seem to get it into their heads that MVVM means no code behind the view, and that's just silly. If you want to put something in the view because it's view related, then go for it. Only the anal would criticise you.

I have CDO, it's OCD with the letters in the right order; just as they ruddy well should be

Forgive your enemies - it messes with their heads

eddieangel7-Oct-10 11:51

eddieangel

7-Oct-10 11:51

Ha, the internet is where the anal come to practice their craft I think.

Regardless, thank you for the insight. I read someone say that you could remove the code behind from a view and still have it work fine. I am sure that was purely contextual though.

By the by, should the MoXAML power toys work with VS 2010 or just 2008?

Cheers, --EA

Pete O'Hanlon7-Oct-10 11:54

7-Oct-10 11:54

At the moment, it's just 2008 - when I've finished the article I'm working on, I'll be upgrading it to 2010.

I have CDO, it's OCD with the letters in the right order; just as they ruddy well should be

Forgive your enemies - it messes with their heads

Mycroft Holmes7-Oct-10 17:19

7-Oct-10 17:19

I am in the same boat as you, just getting started with SL. Having read a swag of articles, studied a number of frameworks and discussed it to death we are now getting into some development. I agree with Pete, only the anal will argue that there should be no code behind. I find we end up with quite a lot sitting in code.

When the renderer in VS10 won't render the view because it can't deal with the viewmodellocator I have no compunction doing the binding in code therefore making the IDE behave.

There seems to be lots of stuff that is purely View related that still need to be done in the code.

Never underestimate the power of human stupidity
RAH

Abhinav S7-Oct-10 20:52

Silverlight MVVM and combo boxes

7-Oct-10 20:52

So long as you dont attempt to access a model attribute, this code looks fine.

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Mycroft Holmes6-Oct-10 23:17

6-Oct-10 23:17

I'm still struggling with these bloody things and I think it is a design issue.

I have a standard MVVM UI with view and viewmodels. I have a viemodellocator that has a static instance of the viewmodels. Each viewmodel basically represents a table in the database.

Two of the viewmodels I have are Trade and Currency, each Trade requires a currency so the view (Trade) needs to get a list of currencies to bind to the combobox.

I service the view with the static Trade VM from the viewmodellocator. TradeVM has a CurrencyList collection that is set to the CurrencyList in the static viewmodellocator. This works fine, ONCE. Then changing the selected Trade record in the Trade VM disturbs the binding and the combobox no longer binds.

This seems to be a widespread issue and there are various work arounds which are plain ugly. Does anyone have a recommendation, blog, article that demonstrates a simple and elegant solution to this rather nasty problem. Or am I doing this completely wrong and need to redesign my approach.

Never underestimate the power of human stupidity
RAH

Pete O'Hanlon6-Oct-10 23:34

6-Oct-10 23:34

Could you post the project (even in a pared down form) somewhere like dropbox, and I'll download it and have a look at it? I'm having trouble visualising how you've laid out the solution and what the interaction is, so I can't really offer relevant advice.

I have CDO, it's OCD with the letters in the right order; just as they ruddy well should be

Forgive your enemies - it messes with their heads

Mycroft Holmes7-Oct-10 0:36

7-Oct-10 0:36

I'll see what I can put together tomorrow, I tried to email you a while ago, had to use your linkedin connection as you don't encourage it here. I think the wife has a dropbox so I'll see what I can do, thanks.

Never underestimate the power of human stupidity
RAH

Pete O'Hanlon7-Oct-10 6:16

7-Oct-10 6:16

I have a gmail account - you can contact me on that.

I have CDO, it's OCD with the letters in the right order; just as they ruddy well should be

Forgive your enemies - it messes with their heads

Mycroft Holmes7-Oct-10 19:49