I use a page (named containerpage) with a ContentPresenter (named PageContent) and set its content to a PhoneApplicationPage instance (contentpage) in the page's OnNavigatedTo() eventhandler. I also have a mainpage with a button "Show Form". When I click on that button, the program navigates to the containerpage, that sets its contentpresenter's content to the contentpage. My problem is: if I click on "show form", then press the back button and click on "show form" again, I get ArgumentException with the text
"The parameter is incorrect"
on line
this.PageContent.Content = contentpage;
in the containerpage's OnNavigatedTo() eventhandler. I guess this is because I already set another ContentPresenter's Content to this contentpage (because navigating creates a new page), but if this is the problem, how can I unassign my contentpage from the previous ContentPresenter's Content?
As decyclone mentioned, your question would be a lot clearer with detailed code. That said, you might implement OnNavigatedFrom() on your conatinerpage and set the Content to null.
You might want to consider how this design holds up if the app gets tombstoned on containerpage.
To be honest, I'm amazed that setting the Content property of one page to be an instance of another page even works! I really would advise against that as a long term solution. If the content of the first page is dynamic based on some condition, then use different UserControls instead.
If the data for the UserControl is not persistent between calls to ShowForm, then you can just create a new instance each time and then you won't have the re-parenting problem.
If you can elaborate on your application scenario and what you are trying to achieve, then we might be able to provide a better answer.
Related
so I have a Homepage on one of the TabPages on winform TabControl. I have a button, that adds a new tab using this Tabs.TabPages.Add("Homepage");
But TabPages.Add() just adds a new blank page, how would i clone my HomePage on the new tab? For instance, if my homepage has a button "Click me", when i open a new tab, I want it to have the same button "Click me" linked to the same event "ClickMe_click". Like a Chrome Tab control. I couldn't find any event or method built in for TabControl on msdn, unless i missed it.
Any help or hint or suggestion would be appreciated. Thanks.
You can't clone a tabpage so easily. One can try but the recommended way is:
Create a UserControl and add all the controls you want on your page. Make it Dock=Fill and add any code that connects the controls. You can layout as freely as you would in a form or a tabpage..
Whenever you want another page of this type, add a new tabpage and add an instance of the UserControl to its Controls collection.
Note: All controls on your UserControl by default are private. This is not really different from placing them on the tabpage directly. But now they are private members of the UC class, so your form and its code can't access them.
Looks like a problem when you're new to it. But if you look at it right, it is a good oportunity to create a leaner & cleaner interface.
Solution 1: Change the control modifiers to public as needed
Solution 2: Add properties to expose those data you really want to expose.
Also note: You can do all layout but can do so only in the UC designer. After adding to a form or tabpage there will be no embedded designer..
Pre-warning, I'm new to C# and XAML, but I'm really enjoying Windows 10 UWP apps. I've got a question on how to appropriately handle a SplitView.
I've got a Main Page, in which I have a SplitView control. In the SplitView Content, I've added a Frame for navigation to other pages. I want to add the Hamburger button on the child page to open the SplitView on the Main Page, but I can't access the SplitView control from the child page. How can I make the SplitView control accessible so that the hamburger button within the sub-page can open the SplitView pane?
The alternative is to add a header in the Main Page and have a static hamburger button there, but I don't like this option as it makes handling the text header content more difficult. Another is to copy the SplitView to each page. I don't want to do this either.
Any advice would be fantastic! Thank you.
I would highly recommend you take your alternative option of including the hamburger button in the main page. Users always expect it to be in the same location every time and changing this approach will probably result in a bad user experience.
You also don't want to be repeating code and thus you don't want to recreate the button on every page as well as any additional functionality like the open/close commands.
Rather than referencing elements from one page to another, a better practice is to keep things loosely coupled. This can be done with a messenger plugin which sends an event from one page to the other which can give it instructions on what you want to do. That way the other page only has to listen for the event instead of holding strong references. To streamline some of this process you could inherit from a base class which implements the messenger functionality.
That would provide a solution to your button and your header text situations but setting them up is out of the scope of this question. Depending on the size of you app and your goals, you might like to look into existing frameworks which helps in designing maintainable apps. A good Mvvm framework I would recommend checking out is MvvmCross which also cross platform and contains a messenger plugin.
Good luck with your app.
I found that solution :
In the MainPage, in your SplitView pane button method, add a SplitView reference as parameter in Navigate() :
private void SlitViewPaneButton_Tapped(object sender, TappedRoutedEventArgs e)
{
var frame = contentFrame;
Page page = frame?.Content as Page;
if (page?.GetType() != typeof(ChildPage))
{
frame.Navigate(typeof(ChildPage), SplitViewName);
}
}
In your ChildPage.xaml.cs :
protected override void OnNavigatedTo(NavigationEventArgs e)
{
SplitView sv = new SplitView();
sv = e.Parameter as NavigateControls;
}
You can now do sv.IsPaneOpen = false, in your ChildFrame code.
Note : if you want to pass several Controls, create a Class with these Controls as variables, and use an instance as parameter.
As stated above, it is better to keep your hamburger button in your main page for a couple of reasons. One is the consistency mentioned above. Second, you would have to recreate the hamburger button in each of your content pages instead of just once in the MainPage.xaml. Additionally, keep in mind, there are different kinds of interactions with the SplitView menu in terms of how it pops in and out and how it is displayed, all listed below.
Inline – When the menu pane is opened, it pushes the content over. When it’s closed, the content goes back to its original location
Overlay – When the menu pane is opened, it lays on top of the content. When it’s closed, it is invisible.
Compact Overlay – When the menu pane is opened, it lays on top of the content. When it’s closed, the pane is still visible in Compact Mode.
Compact Inline – When the menu pane is opened, it pushes the content over. When it’s closed, the content goes back to its original position but the pane is still visible in Compact Mode.
You can also see a quick intro into the SplitView here.
http://jamesqquick.com/windows-10-splitview-intro/
good sirs!
I've been messing around with the next scenario:
First, I have a webform structured as a WebForm containing a DevExpress ASPXPopUpControl and some other controls. Inside the PopUpControl there is a UserControl (lets call it ucA) containing some other controls and a UserControl (called ucB) that contains a cursed ASPxHtmlEditor (added because it's a new requirement).
When the user hits a button on main webform I show the PopUp (originally was a jQuery dialog but since HTMLEditor messes up with jQuery I've been forced to break the standard and use the popup) which contains the ucA. The user fills some fields in ucA and hit the save button. After user hits, I save some dataz and at this point I need to recover a textbox value placed in the webform.
I'm using Parent.FindControl["myTextBox"] but it considers the popupcontrol as parent. When I was using jQuery (before implementing the editor) it worked like a charm.
I feel it's something trivial but thrust me when I say that this stole many hours of research.
Thanks in advance.
EDIT I forgot to mention that I want to look for another UserControl at main webform. This uc its used to display core messages to the user so when he hits the save button, save happens, popup is closed and i look (Parent.FindControl("myUCMessageBoard")) from the ucA for the usercontrol to display a "Transaction complete" message.
I'm thinking you're going to have to do something a little hacky, by using ViewState. If I understand correctly, you are trying to get access to a TextBox's Text on the Web Form, from a UserControl nested within a PopupControl (so you can't traverse all the way up to Web Form Level).
So, what I'd do at some point in the process is store the text in a ViewState variable that you can access from the User Control. It's not optimal, but since you're already hacking to get it to work, what's a little more hacking?
You should expose all controls from ucA as properties, then look for the control inside the DevxPopup the same way you doing. Given that all the controls that you need at the ucA has properties to access them, you could do all the logic you need!
Example:
public ucA : UserControl
{
public string myTextBoxText
{
get
{
return ((TextBox)Controls.FindControl("myTextBox")).Text;
}
}
/*And lot of controls*/
}
Then you looking for the popup at the Form
var ucA = (UcA)Form.Controls.FindControl("myPopup").Controls.FindControl("myucA");
ucA.myTextBoxText = /*Do stuff here with the text*/
Hopes this help you!
How to make a touchable notice top bar in windows phone ?
I am new to C# and windows phone world.So may be my question has a simple
way to solve,but I google a lot ,and didn't work out.
here is my purpose: I have a timer running throughout my app,it request a
service for notice info every one hour, and show a "notice bar" on the top of
screen.
it is easy to get the information ,but when I want to show them to the Page,
here is my problem:
1.
I used system tray to show my info.
It works,but then I found there is no touch or click event for Progress
Indication bar.
I even add an event to Touch.FrameReported in App.xaml.cs , but still ,
when i touch the system tray area, the event doesn't fire.
2.
Then I want to use a Dynamic way to achieve it: add a text block to the
current page
I got the current page handler ,but case I only know the current page
handler's type is PhoneApplicationPage, I can't get my Root UI element
(all my page has a root element named "LayoutRoot")
And when I try to use reflect method to get the "LayoutRoot" property,
the return value is null.
The code looks like this :
Type type = PhoneApplicationPageHandler.getType()<
//I checked,the type is my page's type
type.getProperty("LayoutRoot") or type.getField("LayoutRoot")
//they all return null
BTW: LayoutRoot is a grid, and it is described in my page's .xmal file.
Now My option is to make all my page inherit a defalut page ,in this page ,I will
implement a method to fulfill my second way to simulate a "touchable top bar".
but I think this coding is ugly .
So, can anyone tell me :
1.how to add touch event to a SystemTray
or
2.how to get a handler of an ui element which is described in xaml, while I only have a PhoneApplicationPage type handler of that page.
You may use
1) a toast prompt described here http://windowsphonegeek.com/articles/WP7-Toast-Prompt-in-depth
2)or shell toast described here http://www.c-sharpcorner.com/UploadFile/ae35ca/working-with-toast-notification-in%C2%A0windows-phone-7/ according to what suits your requirement the best. 3)You may also create a custom control which you may place on the top on your mainPage and handle its tap event accordingly.
I want to preface this by saying I'm a noob with WPF/.net programming.
Here is my question that requires a bit of guidance. I have a window and I load pages in and out as my navigation. On one particular page, when the user clicks on one of the items (button for example), I need to display a small form to gather more information. I'm not sure what the best approach is... what I would love (but do not know where to begin even searching for this solution) would be to open a popup balloon style window with a few textboxes and a submit button.
Other options I've explored would be to use a separate page. Save off the current page and load a new page with these textboxes and a submit button. Or to use a custom messagebox instead (least favorite option).
I would like this new extra info page to blend in with rest of the app so that the main page is still visible in the background. Any suggestions??
You can use WPF's Popup control
<Popup>
<!-- Your Content Here -->
</Popup>
Personally I have issues with WPF's Popup, so have my own custom UserControl that works like a Popup.
I ended up using modal window (ShowDialog) method for this.