Re: wpf [modified] - WPF Discussion Boards

2-Feb-11 11:54

I have populated a combo box as follows:

<ComboBox Height="23" HorizontalAlignment="Left" Margin="120,6,0,0"
Name="cboHealth" SelectedIndex="{Binding Path=HealthLevelID}"
VerticalAlignment="Top" Width="256" />

private void PopulateHealthLevels()
{
List<clsDetails> healthlevels = new List<clsDetails>();
healthlevels = clsAccess.GetHealthLevels();
foreach (clsDetails details in healthlevels)
{
cboHealth.Items.Add(details.HealthLevelName);
}
}

The datatable returns the HealthLevelID field as well as otherr fields.
HealthLevelID has values of 1 and 2 for Normal and unNormal respectively.
The combo box does get populated but it does not show the correct item for the selected row.
What am I doing wrong please?
Thanks

Re: wpf

Pete O'Hanlon3-Feb-11 0:04

3-Feb-11 0:04

A couple of things here.

1. Your title needs some work. Simply stating wpf is not enough.
2. The code should be enclosed in pre tags.

Now, your problem lies in the fact that SelectedIndex is actually zero based, so your values will not match. SelectedIndex should only be used to indicate the relative position of the object in your collection.

I'm not a stalker, I just know things. Oh by the way, you're out of milk.

Forgive your enemies - it messes with their heads

Re: wpf

arkiboys3-Feb-11 0:17

wpf, populate combobox accordingly

3-Feb-11 0:17

Hi,
At present the HealthLevelID has only values 1 or 2 in it's tblHealthlevels table.
Do you mean that since I am using selectedindex in xamml, I can change the integer values in the sql server table to be 0 and 1 instead of 1 and 2 and then it will work? If so, what if I add more values in the table such as 1, 2, 3, 4, ...
Will my existing xaml work ok?
Thanks

arkiboys3-Feb-11 10:48

Re: wpf, populate combobox accordingly

3-Feb-11 10:48

I did do what you mentioned but still unable to solve this issue.
Any thoughts please?

Pete O'Hanlon3-Feb-11 11:47

3-Feb-11 11:47

Rather than relying on the selected index, I prefer to use a selected item.

I'm not a stalker, I just know things. Oh by the way, you're out of milk.

Forgive your enemies - it messes with their heads

Re: wpf, populate combobox accordingly

arkiboys3-Feb-11 11:52

Database Connectivity in Silverlight Web Application

3-Feb-11 11:52

Still have the same problem.

Re: wpf [modified]

Renat Khabibulin3-Feb-11 0:10

Renat Khabibulin

3-Feb-11 0:10

Seems that ComboBox doesnt know that HealthLevelID was changed, try this:

BindingExpression binding = BindingOperations.GetBindingExpression(cboHealth, ComboBox.SelectedIndexProperty);
if (binding != null)
{
  binding.UpdateTarget();
}

Also, make sure that HealthLevelID is public

modified on Thursday, February 3, 2011 6:35 AM

Re: wpf

RichardGrimmer4-Feb-11 4:57

RichardGrimmer

4-Feb-11 4:57

You're missing Mode=TwoWay from your binding expression (assuming it's the same in WPF as Silverlight)

C# has already designed away most of the tedium of C++.

WCF Policy File

Vimalsoft(Pty) Ltd2-Feb-11 0:20

Vimalsoft(Pty) Ltd

2-Feb-11 0:20

Good Day All

I have a Policy file in the Root of my wwwRoot. and i have place it in the Folders of the indivisuall services, but i get a warning that says

Warning    1  Could not locate cross-domain policy at 'vuyiswa-pc': Web services might not be accessible at runtime by your Silverlight application. For more details please contact the web server administrator or press F1 after selecting this warning     0   0

and this make my app to fail with the cross domain Error

An error occurred while trying to make a request to URI 'http://localhost/BLLBusiness/BLLService.svc'. This could be due to attempting to access a service in a cross-domain way without a proper cross-domain policy in place, or a policy that is unsuitable for SOAP services. You may need to contact the owner of the service to publish a cross-domain policy file and to ensure it allows SOAP-related HTTP headers to be sent. This error may also be caused by using internal types in the web service proxy without using the InternalsVisibleToAttribute attribute. Please see the inner exception for more details.

Does any have an Idea ?

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@its.co.za
http://www.itsabacus.co.za/itsabacus/

Re: WCF Policy File

Abhinav S5-Feb-11 18:02

Abhinav S

5-Feb-11 18:02

Using a wire sniffer tool like Fiddler, check if the file is actually downloaded to the client.
If no, then I guess the location of the file is incorrect.

The funniest thing about this particular signature is that by the time you realise it doesn't say anything it's too late to stop reading it.

My latest tip/trick

Re: WCF Policy File

Vimalsoft(Pty) Ltd5-Feb-11 19:38

Vimalsoft(Pty) Ltd

5-Feb-11 19:38

Good Day Abhi

Thanks for your reply, it is not easy to find a problem in this situation. even Fiddler pointed out nothing. so what i did to resolve this is that i have change the application Pool to .net 4 Classic and it started to work, i could see the policy files via the local-host uri.

Thanks

Sunil G 330-Jan-11 22:09

Sunil G 3

30-Jan-11 22:09

Hi All,

I want Database Connectivity in my Silverlight Web Application without using WCF service. Is is possible?

I have googled but no luck.

Thank U,
Sunil G.

Re: Database Connectivity in Silverlight Web Application

Pravin Patil, Mumbai30-Jan-11 23:25

Pravin Patil, Mumbai

30-Jan-11 23:25

Hi Sunil,
When you want to use Silverlight for Web Developement and at the same time want to communicate with the database then you only have the option of service, whether Web Service of WCF Service.
But why don't you want to use WCF..?

Re: Database Connectivity in Silverlight Web Application

Abhinav S30-Jan-11 23:45

Abhinav S

30-Jan-11 23:45

You can use the Entity framework - http://michaelsync.net/2008/01/15/consuming-adonet-data-service-astoria-from-silverlight[^].

The funniest thing about this particular signature is that by the time you realise it doesn't say anything it's too late to stop reading it.

My latest tip/trick

Re: Database Connectivity in Silverlight Web Application

Ibrahim.Poonawala1-Feb-11 4:19

Ibrahim.Poonawala

1-Feb-11 4:19

No. Its not possible in silverlight. Silverlight runs client side and it cannot make server side calls.

Re: Database Connectivity in Silverlight Web Application

Pete O'Hanlon1-Feb-11 4:26

1-Feb-11 4:26

Sorry, but it is possible to have a local client side database. There are a number of projects which aim to provide this functionality via Isolated Storage. Here's[^] one such example.

I'm not a stalker, I just know things. Oh by the way, you're out of milk.

Forgive your enemies - it messes with their heads

Re: Database Connectivity in Silverlight Web Application

Vimalsoft(Pty) Ltd6-Feb-11 19:47

Vimalsoft(Pty) Ltd

6-Feb-11 19:47

Well i don't think its no a problem to achieve that , but its not a good way to go. I have some Silverlight Apps that Connects to the Database without using WCF , i am just using pure OOP , but these are very small apps, the way to go is RIA. You need to use WCF Services its much easier like that.

Control to display Html in a string - not WebBrowser control

devvvy27-Jan-11 15:49

devvvy

27-Jan-11 15:49

Hi
Looking for a user control which can display HTML in a string variable (not a url, not a html document saved on a disk so WebBrowser control won't do it)

Is there one?

Thanks

dev

Re: Control to display Html in a string - not WebBrowser control

_Maxxx_27-Jan-11 16:49

_Maxxx_

27-Jan-11 16:49

WebBrowserControl has a NavigateToString [^]method - can you not use that?

___________________________________________
.\\axxx
(That's an 'M')

Re: Control to display Html in a string - not WebBrowser control

devvvy27-Jan-11 21:38

devvvy

27-Jan-11 21:38

Oh I was checking out methods and properties of WebBrowser control didn't see that.

Thanks for tip

dev

Re: Control to display Html in a string - not WebBrowser control

Abhinav S28-Jan-11 2:17

Abhinav S

28-Jan-11 2:17

You can actually just use an Iframe as discussed here - http://forums.silverlight.net/forums/p/15047/50272.aspx[^].

The funniest thing about this particular signature is that by the time you realise it doesn't say anything it's too late to stop reading it.

My latest tip/trick

TDD - Messenger, Testing Help Request...

_Maxxx_27-Jan-11 15:27

_Maxxx_

27-Jan-11 15:27

To be fair, I think this is a TDD question rather than specifically WPF - but it is the use of the messanger in MVVM in WPF that is causing the issue - hence the post here...

WPF with MVVM using the bare bones of the MvvmFoundation.

public CustomerSelectionAndSummaryViewModel(IController controller, FrameworkElement view)
    : base(controller, view)
{
    controller.Messenger.Register(Controller.MSG_Customer_SELECTED, new Action<CustomerListItemViewData>(ProcessSelection));
    CustomerSelectionViewModel = new CustomerSelectionViewModel(controller);
    CustomerSummaryViewModel = new CustomerSummaryViewModel(controller);
}
#endregion

private void ProcessSelection(CustomerListItemViewData CustomerListItemViewData)
{
    // Get the data to show in our small, local summary
    CustomerSummaryViewModel.ViewData = Controller.GetCustomerSummaryViewData((int) CustomerListItemViewData.CustomerId);
    // Ask the controller to handle the selection
    Controller.CustomerSelected((int) CustomerListItemViewData.CustomerId);

}

Briefly, the Constructor is passed an IController - which is just a helper class, and a view (which we can ignore for these purposes)
The base class for our ViewModel stores the IController in a property.
YOu can see I register the message for a customer being selected - so that when a customer is selected I can action the selection. The rest of the constructor just instantiates a couple of other View Models that are children of this one- again this can be ignored.

So the Action passed to the Messenger.Register method 'points to' the ProcessSelection method.

Here I am saying, when something sends the Customer_SELECTED message, this ViewModel wants to handle it by executing the ProcessSelection method.

With me so far? Good Ho!

I've made the method private because the other developers are just plain stoopid (I'm a sole developer on this one, in fact, but ITRW...) and if it's not private they might decide to use it directly, which is NAGT (Not A Good Thing)

OK so, I hear you ask, what's the prob?

I want to be a good little dev and use some tests. I'd like to test the ProcessSelection() method somehow, to ensure that it calls the CustomerSelected() method with the selected Customer ID when passed a valid CustomerListItemViewData.

So (bear in mind I'm very new to TDD here)

The main stumbling block for me here is that the method is private - and I'd like it to remain so.

I can see this being a problem with these messages flying about (as the project expands) as the ViewModels are likely to use private methods to implement the functionality required when handling the message.

Many people seem to say that you shouldn't test private methods. Fair enough - but in this case shouldn't I be testing the functionality of the system when a Customer is selected?

I'm thinking that this particular private method is, in essence, public because it can be executed (be sending a message) from outside of its class. So, perhaps this is a more generic question.

The only alternate option I can think of right now would be to not test this method, but instead test the method by sending the message..?

OK - I've waffled enough! I'm, hoping you have the stamina to read through this and help me out - if not, well, it's been cathartic writing it anyhoo.

___________________________________________
.\\axxx
(That's an 'M')

Re: TDD - Messenger, Testing Help Request...

Pete O'Hanlon27-Jan-11 22:41

27-Jan-11 22:41

You're right. You don't test the private method - you test the code that calls the private method. The easiest way, as you have identified, is to send the message and see what the effect is. Your test doesn't have to be complicated at all.

I'm not a stalker, I just know things. Oh by the way, you're out of milk.

Forgive your enemies - it messes with their heads