Re: Button Bound To Command Won't Disable - WPF Discussion Boards

Silverlight Application vs Silverlight Business Application

13-Jul-12 9:33

That did it!

_SelectedLinkCommand = new RelayCommand<NodeModel>(p => selectedTreeItemExecuted(p), p => selectedTreeItemCanExecute(p));

Worked like a charm. Thanks

ya know, I notice that there's not alot on CP about a TreeView with Hyperlinks. Maybe I'll turn this into an article. WHat do ya think?

If it's not broken, fix it until it is

Kevin Marois12-Jul-12 6:14

Re: Silverlight Application vs Silverlight Business Application

12-Jul-12 6:14

What's the difference?

I can't seems to find a difinitive description.

If it's not broken, fix it until it is

RobCroll12-Jul-12 13:08

RobCroll

12-Jul-12 13:08

Don't know if there is a definitive description but the Application template is the most basic and provides limited boilerplate code to get started. The Business Application template throws in a whole lot of extra boilerplate providing functionality that a typical LOB application.

Quote from Walkthrough: Using the Silverlight Business Application Template[^]
"The Silverlight Business Application template creates a project that automatically includes many features that you typically want in a business application, such as controls to log in users and to register new users. The project created by the template is also set up to use Silverlight navigation, which means you can easily add new Silverlight pages for additional functionality."

"You get that on the big jobs."

Re: Silverlight Application vs Silverlight Business Application

Kevin Marois12-Jul-12 13:18

WPF Charting Grouped Column Chart

12-Jul-12 13:18

Thanks. Clear as mud

Smile | :)

If it's not broken, fix it until it is

jonathan1512-Jul-12 3:29

jonathan15

12-Jul-12 3:29

I have had an odd request and just cant find any info on how (or even if) this can be done.

I am using the wpf toolkit charting controls to create a column chart. This bit is simple enough but what about showing columns in columns. The data i am using is like this:

Group
- GroupName
- Strength
- GroupItems()

GroupItem
- ItemName
- ItemStrength

So i have an observble collection of 'Groups' which is the itemsource for my column chart using the groupname as the independent and the Strength as the dependent. This works fine.

What you can see though is that each group also has a collection of 'GroupItems' (there can be 2 to 5 of these per group). What i would like is that within the outline of the 'Group' column i can see the columns for the 'GroupItems' that belong to that group.

Is this even possible?

Button Bound To Command Won't Disable

Kevin Marois11-Jul-12 8:07

11-Jul-12 8:07

Working on a WPF MVVM app...

I have this button:

<Button Background="Transparent"
        BorderBrush="Transparent"
        Command="{Binding RunCommand}"
        Margin="2"
        Width="120"
        Height="40">
    <StackPanel Orientation="Horizontal">
        <Image Source="/DemoUI;component/Images/run.png"
                Height="32"
                Width="32"
                Margin="3"/>
        <TextBlock Text="Run Test"
                    VerticalAlignment="Center"/>
    </StackPanel>
</Button>

It's bound to RunCommand:

private ICommand _RunCommand;
public ICommand RunCommand
{
    get
    {
        if (_RunCommand == null)
        {
            _RunCommand = new RelayCommand(runTest, runTestCanExecute);
        }
        return _RunCommand;
    }
}

Here's the methods:

private void runTest()
{
    isTesting = true;

    var device = (from d in tempDevices
                    where d.DeviceId == SelectedDevice.DeviceId
                    select d).FirstOrDefault();

    diag.ExecuteTest(device, SelectedTest);
}
private bool runTestCanExecute()
{
    return !isTesting;
}

isTesting is defaulted to False. The button does not disable.

Anyone see what's wrong?

If it's not broken, fix it until it is

modified 11-Jul-12 14:53pm.

SledgeHammer0111-Jul-12 9:37

SledgeHammer01

11-Jul-12 9:37

Are you sure its not disabled? You are overriding the content, so it may appear to be enabled, but really be not clickable because you aren't handling the disabled state.

Kevin Marois12-Jul-12 6:50

12-Jul-12 6:50

Ya, it's still responds to clicks.

If it's not broken, fix it until it is

SledgeHammer0112-Jul-12 7:14

SledgeHammer01

12-Jul-12 7:14

Copy & pasted your code into a test project and it disables just fine. Make sure your DataContext is set properly or it won't know where the command is. I.e. put a break point on your CanExecute handler and make sure its actually getting called.

Kevin Marois12-Jul-12 7:37

12-Jul-12 7:37

Ok, I see what's going on. isTesting is somehow reverting to false by the time the CanExecute is called.

Stay tuned.....

If it's not broken, fix it until it is

Mycroft Holmes11-Jul-12 13:19

Mycroft Holmes

11-Jul-12 13:19

Try this, change you button to use a Click="" event instead of a Command.

Never underestimate the power of human stupidity
RAH

RobCroll12-Jul-12 13:21

RobCroll

12-Jul-12 13:21

I haven't got VS at hand at the moment but couldn't you just do something along the lines of:

<Button IsEnabled="{Binding RunTestButtonEnabled} /Button>

Where RunTestButtonEnabled is a property in your ViewModel.

"You get that on the big jobs."

Changing Cell Color dynamically in Datagrid using C#.net

PaulLinton16-Jul-12 20:08

PaulLinton

16-Jul-12 20:08

Whenever you change isTesting you will need to call

RunCommand.OnCanExecuteChanged()

(If it isn't, you might want to make isTesting a property and call OnExecuteChanged from the Setter)

palaniappan v10-Jul-12 21:41

palaniappan v

10-Jul-12 21:41

Hi All,

I am using datagrid in wpf.actually my requirement is used to show different color in particular cell after every two minutes like first two minutes we need to show blue then Red but values in that cell should not get changed.I have shown the color in the cell using datatrigger through Xaml but i need to add that dynamically into the datatemplate and show the cell coloring.so,if any one knows about this please help me out of it.

Thanks in Advance Confused | :confused:

Palaniappan

Re: Changing Cell Color dynamically in Datagrid using C#.net

Pete O'Hanlon10-Jul-12 23:55

Re: Changing Cell Color dynamically in Datagrid using C#.net

10-Jul-12 23:55

OK, this is fairly simple to achieve with the use of a Timer, a public property and a value converter. What you need to do is create a property that you will bind to as part of the collection that you are binding your DataGrid against. The timer will be used to change the value of the property.

The value converter simply converts this value into an appropriate colour. Your Background will be bound to the property, and you will use the value converter as your converter.

*pre-emptive celebratory nipple tassle jiggle* - Sean Ewington

"Mind bleach! Send me mind bleach!" - Nagy Vilmos

CodeStash - Online Snippet Management | My blog | MoXAML PowerToys | Mole 2010 - debugging made easier

Mycroft Holmes11-Jul-12 1:02

Mycroft Holmes

11-Jul-12 1:02

Oh I know start the timers slightly offset on each record. Duck dodge weave rock hide under!

Never underestimate the power of human stupidity
RAH

Re: Changing Cell Color dynamically in Datagrid using C#.net

Pete O'Hanlon11-Jul-12 1:04

Re: silverlight databinding

11-Jul-12 1:04

Mycroft Holmes wrote:
Oh I know start the timers slightly offset on each record. Duck dodge
weave rock hide under

Or just use one timer and update ALL records. I prefer your solution though.

*pre-emptive celebratory nipple tassle jiggle* - Sean Ewington

"Mind bleach! Send me mind bleach!" - Nagy Vilmos

CodeStash - Online Snippet Management | My blog | MoXAML PowerToys | Mole 2010 - debugging made easier

silverlight databinding

Bhushan futane10-Jul-12 19:04

Bhushan futane

10-Jul-12 19:04

hiii..
can any one tell me how to make batabse connectivty wid controls lik datagrid....

Abhinav S10-Jul-12 19:44

Abhinav S

10-Jul-12 19:44

Try http://beyondrelational.com/modules/2/blogs/433/posts/12021/different-ways-to-bind-data-grid-in-silverlight.aspx[^].
You can also always check out the msdn site.

Build your own survey - http://www.factile.net

Make a textbox act like Excell Cell

Vimalsoft(Pty) Ltd9-Jul-12 7:29

Vimalsoft(Pty) Ltd

9-Jul-12 7:29

Hi All

i am converting an Excell spreadsheet into an application. So i am doing automatic calculations like Excell do , for some of the cells(textbox) should allow a user to enter the minus sign "-" , and this automatically minus value entered. So my issue here is if th the users enters that character it breaks my app's calculations. Does anyone have any idea how to bypass this ?

Thanks

Vuyiswa Maseko,

Spoted in Daniweb-- Sorry to rant. I hate websites. They are just wierd. They don't behave like normal code.

C#/VB.NET/ASP.NET/SQL7/2000/2005/2008
http://www.vuyiswamaseko.com
vuyiswa[at]dotnetfunda.com
http://www.Dotnetfunda.com

Pete O'Hanlon9-Jul-12 7:57

9-Jul-12 7:57

Vuyiswa Maseko wrote:
So my issue here is if th the users enters that character it breaks my app's
calculations. Does anyone have any idea how to bypass this ?

Without knowing how your application works, no. I don't know what code you've actually written, so how can I tell you what's wrong with it. I will say one thing though - if you can cope with positive numbers, you should be able to cope with negative ones. After all, taking away is merely adding a negative number.

*pre-emptive celebratory nipple tassle jiggle* - Sean Ewington

"Mind bleach! Send me mind bleach!" - Nagy Vilmos

CodeStash - Online Snippet Management | My blog | MoXAML PowerToys | Mole 2010 - debugging made easier

Vimalsoft(Pty) Ltd9-Jul-12 8:20

Vimalsoft(Pty) Ltd

9-Jul-12 8:20

hi Pete

Thanks for your reply. i am just looking at ideas without any coding examples. What i need is a logic to bypass this.

lets take a Cell in an Excel spreadsheet,you normally can enter numeric values and by default anything that has no sign "-" is a "+" so now when it comes to negative in Excel it will subtract the value in the cell from somewhere. So in .e.g asp.net or silverlight , if you want to mimic that Excel behavior how can do that , because immediately when that value is entered it changes the data in the textbox not to fall under "int" or "decima" because there is a special character.

You know what ?

i just Figured out.

i will keep the value as is and when it is being calculated against another Field , i will sum what needs to be summed and subtract on any field that has that sign

Sometimes when you explain the problem to someone you might find the solutiion

Thanks

Pete O'Hanlon9-Jul-12 8:44

9-Jul-12 8:44

Vuyiswa Maseko wrote:

Sometimes when you explain the problem to someone you might find the
solutiion

Often the way my friend, and a 5 for such enlightenment.

*pre-emptive celebratory nipple tassle jiggle* - Sean Ewington

"Mind bleach! Send me mind bleach!" - Nagy Vilmos

CodeStash - Online Snippet Management | My blog | MoXAML PowerToys | Mole 2010 - debugging made easier