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breakpoint not hit --> symbols not loaded, but just for one line of code...
VS2010, C#, Silverlight code behind (xxx.xaml.cs)
here's the code:
List<EntityRec> EntityRecList = new List<EntityRec>
(
new EntityRec[]
{
new EntityRec()
{
Name = "Well List 1",
Entity = "Wellbore",
Count = 17,
Description = "This is a random list of wells that contains\r\nseveral unique formations and depths.",
IsPublic = false
},
...
);
But if I create an array of EntityRec with a fixed size and explicitly assign the new EntityRec items, all break points are hit just fine...
Weird...
Cost me about 3 hours to figure that one out 
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When you do stuff inline like that, the debugger may not stop where you expect because the MSIL may be quite different  .
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Make sure 'Debug Silvelight' option in the web project properties is checked.
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.
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i search google for restyling tab control in WPF and i found many but i am not getting any sample according to my requirement. here i am attaching the picture of the tab control which looks good.
http://i.imgur.com/r48AO.png
i want to have the same look tab control in WPF so please some one guide me how to do it. thanks
tbhattacharjee
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You can dump the tab control templates out in Expression Blend very easily. Then just modify them how you want. To get them to overlap like that is quite hard though. Nobody is going to write XAML for you though . You might want to buy a UI library to save you the trouble. Most have tabs like that. Its definitely not a "5 minute job" due to the overlapping .
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Hi,
I have two silverlight pages in the root of my silverlight application, Page1 and Page2.
I want to open page2 in a new window from page1 (say, on some button click event).
(When Page2 window is opened then, Page1 should not get closed.)
I have tried the following however,none of the belows ways are working:
1. this.NavigationService.Navigate(new Uri("/Page2.xaml", UriKind.Relative));
2. HtmlPage.Window.Navigate(new Uri("/TestSilverlightAppTestPage.html/Page2", UriKind.RelativeOrAbsolute), "_blank", "menubar=0,resizable=0,scrollbars=0,status=0,toolbar=0,width=500,height=300");
3. HtmlPage.Window.Navigate(new Uri("/Page2.xaml", UriKind.RelativeOrAbsolute), "_blank", "menubar=0,resizable=0,scrollbars=0,status=0,toolbar=0,width=500,height=300");
-Thanks in advance.
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Make sure you have an appropriate UriMapper element in MainPage.Xaml for the 2nd page.
".45 ACP - because shooting twice is just silly" - JSOP, 2010
-----
You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
-----
"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
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Hi,
At present I have developed the following code which works on th esilverlight page.
private void GetLatestData()
{
WinService.ClassNameClient client = new WinService.ClassNameClient();
client.GetDataCompleted += new EventHandler<WinService.GetDataCompletedEventArgs>(client_GetDataCompleted);
client.GetDataAsync();
}
void client_GetDataCompleted(object sender, WinService.GetDataCompletedEventArgs e)
{
txtCount.Text = e.Result.Count.ToString();
}
Question:
I would like to use a backgroundworker to do the above job in the silverlight page...
I have managed to do the following but not sure what to do next to complete this work?
Any thoughts please?
Thanks
using System.ComponentModel;
...
...
private BackgroundWorker backgroundWorker = new BackgroundWorker();
public ClassName()
{
InitializeComponent();
backgroundWorker.WorkerReportsProgress = true;
backgroundWorker.WorkerSupportsCancellation = true;
backgroundWorker.DoWork += backgroundWorker_DoWork;
backgroundWorker.RunWorkerCompleted += backgroundWorker_RunWorkerCompleted;
}
private void backgroundWorker_DoWork(object sender, DoWorkEventArgs e)
{
if (backgroundWorker.CancellationPending)
{
e.Cancel = true;
return;
}
e.Result = ??;
}
private void backgroundWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
}
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I wish whoever was downvoting you would stop. Anyway, it's pointless running this in a background thread; it's an asynchronous operation so running it as background is pretty redundant.
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I have placed a timer on the silverlight page where every 10 seconds it calls a windows service for some data. Even with this architecture, don't you think a background worker is required. I know the call to the win service is asynchronous but with having a timer in the page should there be a background worker?
Thanks
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The problem is you're calling an asynchronous operation in order to call an asynchronous operation... Allow me to illustrate...
Form: "Ok, I want you to check this thing every ten seconds, and just write the results on this chalkboard over here..."
Timer: "No problem!"
backgroundWorker.DoWork += backgroundWorker_DoWork;
* Timer goes back to his office...
Timer: "Alright, you there... When I ring this bell, I want you to go perform your task, and let me know how it goes."
BackgroundWorker: "You got it, boss!"
Timer: "Ready..... *ding*!"
private void backgroundWorker_DoWork(object sender, DoWorkEventArgs e)
* BackgroundWorker runs to his office...
BackgroundWorker: "Hey, I need you to check this service for me."
Client: "Um, ok, but it's going to take a while..."
BackgroundWorker: "Yeah, I don't care... Just go do it, ok?"
Client: "If you say so..."
* Client goes off to check on the service
e.Result = ??;
* BackgroundWorker goes back to Timer
BackgroundWorker: "Ok, all taken care of."
Timer: "Really? Already? I thought that would take a while."
BackgroundWorker: "Well, you know me."
Timer: "Right... So... uh... Did it all work out ok?"
BackgroundWorker: "Uh... yeah... sure... I mean, yeah, everything's great."
Timer: "Ok, good."
void client_GetDataCompleted(object sender, WinService.GetDataCompletedEventArgs e)
* Timer makes a note on Form's chalkboard
...Meanwhile...
* Client works on the job... Tick tock tick tock...
Client: "Ok, that took longer than I expected... Hey, BackgroundWorker, I have the results you wan-- Oh... You went home for the day... Uh... Anyone care? I'm done now... I mean, there were some problems, but... Anybody? Anybody at all? Oh well... Guess they didn't really want this Exception..."
(Sorry, I'm in an odd mood this morning...)
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 ...can you do another one for me please?
Illogical thoughts make me ill
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What the list thing over in C#? Not nearly as entertaining
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haha, that post is getting too nodey. I like your teaching style thou.. can you do a version that explains why code behind in a WPF application View is bad while using an MVVM design pattern (I still don't see the logic)
Illogical thoughts make me ill
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Ya know, I was never a big fan of strictly adhering to design patterns... I consider them guidelines, not rules.
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musefan wrote: can you do a version that explains why code behind in a WPF application View is bad
It's not necessarily bad. It just depends on the code.
Here's an example that might help explain it:
You are running a company that makes the iWidget - it's the latest, greatest, MP3 player. Now, you outsource the actual manufacturing of the components to third parties (the ViewModel). Your job is to assemble them together (the View). Now, you want to have fancy, schamncy wizzing window effects. You could outsource this to the component manufacturers, but it actually makes a lot more sense in this case for you to do it yourself.
And there you have the delineation of responsibilities in MVVM - the VM does the logicy, commandy stuff, while the view does the view related stuff.
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Hello Ian,
Could I please you to help me with my problem?
I have this code in big method in my Silverlight application that uses WCF service:
private void F()
{
DatabaseServiceClient client = new DatabaseServiceClient();
client.GetSubsystemsByTestRunIDCompleted +=
new EventHandler<GetSubsystemsByTestRunIDCompletedEventArgs>(client_GetSubsystemsByTestRunIDCompleted);
client.GetSubsystemsByTestRunIDAsync(testRunID);
treeAdditionalInfo.Items.Clear();
foreach (string subsystemName in lstSubsystems)
{
TreeViewItem subsystemItem = new TreeViewItem();
subsystemItem.Header = subsystemName;
subsystemItem.FontSize = 14;
treeAdditionalInfo.Items.Add(subsystemItem);
}
List<KeyValuePair<string, List<TestLogSmall>>> lstFormsAndActions =
client.GetFormsAndActions(testRunID).ToList();
client.GetFormsAndActionsCompleted +=
new EventHandler<GetFormsAndActionsCompletedEventArgs>(client_GetFormsAndActionsCompleted);
client.GetFormsAndActionsAsync(testRunID);
...
}
The code in first 2 callbacks is this:
private void client_GetSubsystemsByTestRunIDCompleted(
object sender, GetSubsystemsByTestRunIDCompletedEventArgs e)
{
lstSubsystems = new List<string>();
if (e.Error == null && e.Result != null)
lstSubsystems = e.Result;
}
private void client_GetFormsAndActionsCompleted(
object sender, GetFormsAndActionsCompletedEventArgs e)
{
lstFormsAndActions = new List<KeyValuePair<string, List<TestLogSmall>>>();
if (e.Result != null)
lstFormsAndActions = e.Result;
}
I need to get the list after this call:
client.GetSubsystemsByTestRunIDAsync(testRunID);
And to get the list after this call as well:
client.GetFormsAndActionsAsync(testRunID);
How can I do that? What should I write?
Thank you in advance.
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I think you're a little confused as to the workings of an asynchronous operation. Here's what you're doing...
F: "Ok, client, I want you to go get all of those subsystem thingies."
Client: "Sure thing, boss... I'll be right back."
F: "Good, now let's put those subsystems in the tree--"
Client: "Hold on! I haven't even left yet!"
F: "Where's my list of subsystems?"
Client: "Give me a #(%*&#ing minute to get it!"
F: "Ok, I guess there aren't any... Now, Client... Oh good, you're here."
Client: "Of course I'm here... You haven't given me a chance to leave yet!"
F: "Now go grab all of those forms and actions, ok?"
Client: "Fine... But it's going to take a few minutes to--"
F: "Good, now let's put the forms and actions into--"
Client: "That's it! I quit! Get your own #(*%&#ing actions!"
Now, here's what you want to be doing...
F: "Ok, Client1, I want you to go get all of those subsystem thingies."
Client1: "Will do."
* Client1 goes off to do his job
F: "Great... Now, Client2, you're going to fetch all of those forms and actions."
Client2: "Yep, I'm on it, boss!"
* Client2 goes off to do his job
* F makes sure everyone is gone, and turns on the TV to check the latest scores...
* Client1 and Client2 both return
* Client1: "All done. Here's the results."
* Client2: "Me too... Here's mine.
* F turns off the TV, grumbling about how he has to actually do some work
* F: "Alright, you first... Let's put these things in the tree......"
So you see, when you send the clients off to do something, that's called an asynchronous operation... Because they can do something on their own, and you don't have to sit there waiting for them to finish. Sending them off is your RunAsync() operation, whatever you want to call it.
The trick is that you're trying to read the results as soon as you send them away, instead of doing that after they come back. When they return with the results, that's the "GetSubsystemsByTestRunIDCompleted" event, in your example. THAT's where you should be processing the resulting data... In the handler for that event.
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Ian,
Thank you very much for your answer.
I've understood Silverlight programming model was different than WPF.
If I understand you correctly, it's not possible to do the thing I need?
If so, it's not so good. My method is fairly long and complex. And the things are going in the loop as well. So, if I need to rearrange all these things, hm...
Is there any way to overcome this async style of doing the things?
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Not directly know, and it is bad practice to consider doing it. You would, potentially, have to leave a long running connection open to a web server which would put a strain on resources.
Honestly, this is why desktop people shouldn't be writing web applications - the two disciplines are just too different.
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Please don't hijack somebody else's thread. That's just impolite.
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Hello,
I don't think it's impolite. It's normal communication between people. But, in any way, I won't do that in the future.
Regards,
Goran
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It's not good form. The whole point of a threaded question is to answer the original posters problem, not to introduce something confusing into the mix. You have added nothing, other than a distraction, to the posters knowledge.
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Again, not specifically WPF but ...
Most of the MVVM frameworks implement some sort of Messaging pattern to allow ViewModels to communicate.
Say VM1 selects a customer, it sends a "Customer Selected" message and VM2 responds to that message by displaying that customer's details.
All (that I have looked at) use a singleton Messenger object (the name varies) to which every VM has access and can subscribe to Messages or send messages.
And it all works fine and dandy.
Here's the bit I don't understand.
would it not be just as easy (if not easier) to use events? Isn't this just what the messenger is duplication?
So VM1 selects a customer and tells an "Eventor" singleton to raise the "Customer Selected" event. VM2 has subscribed to this event, and so displays that customer's details when it is raised.
I feel sure that there's a good reason for not doing this, but I'm stuffed if I can think what it is?
(Just to show I'm not a complete doofus, I am aware that most Messenger implementations avoid potential memory leaks by using WeakReferences, which may be an advantage - but is that the only reason for using it?)
Thanks
___________________________________________
.\\axxx
(That's an 'M')
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_Maxxx_ wrote: (Just to show I'm not a complete doofus, I am aware that most Messenger implementations avoid potential memory leaks by using WeakReferences, which may be an advantage - but is that the only reason for using it?)
No, that's not the only reason - in fact, routed events use weak references internally as well.
_Maxxx_ wrote: I feel sure that there's a good reason for not doing this, but I'm stuffed if I can think what it is?
Decoupling. Purely and simply, decoupling. With event subscription you create an implicit hard relationship between the subscriber and the subscribee, so your ViewModels end up having knowledge of each other, which makes testing much more problematic. If you accept that one of the key tenets of MVVM is increasing testability then you see that having a mechanism that allows you to mock out the source of the "event" makes it much easier to test the VM.
I hope that helps.
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