I'm writing a Windows 8 Store application and within that I've designed my own user control.
Here is the code for my usercontrol (This is a dummy control but the problem exists with this):
<UserControl
x:Class="Windows8StoreTest.TestUserControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:Windows8StoreTest"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
Width="70"
Height="40">
<StackPanel>
<Button Content="Hello" Foreground="Pink" BorderBrush="Pink"/>
</StackPanel>
</UserControl>
I've dropped the user control onto my page and give it a name:
<Page
x:Class="Windows8StoreTest.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:Windows8StoreTest"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}">
<local:TestUserControl Name="testControl"/>
</Grid>
</Page>
However, when I go to the code behind I can't access the control by that name. It doesn't seem to exist! What is weird is that the control doesn't exists within InitializeComponent() method for the MainPage class which will be why it does exist.
What am I missing from my user control?
I'm using Windows 8 Store, XAML, c#.
Thanks in advance
Try to use this:
<local:TestUserControl x:Name="testControl"/>
Should work...
hello i don't know what is wrong but it should work.i have just made a sample example of it..i am putting it here hope you have done the same way.
<Page
x:Class="App12.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:App12"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}">
<local:MyUserControl1 x:Name="hellousercontrol" />
</Grid>
in my mainpage.cs.. i have just use it like this..
public MainPage()
{
this.InitializeComponent();
hellousercontrol.Height = 100;
}
one more this..have build your solution ?
I had the same issue in c++ environment. I observed, I didn't had default constructor in my class, as soon as I added the default constructor, I could use the defined UserControl in my project through XAML file. However without default constructor I was able to use it from within c++ code.
Related
I am trying without success to compose a xaml page with an usercontrol. The purpose is to lighten the main page.
here is the UserControl beginning:
<UserControl x:Class="WpfApp1.richTextSummary"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:WpfApp1"
mc:Ignorable="d"
d:DesignHeight="450" d:DesignWidth="800"
xmlns:toolkit="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Layout.Toolkit"
xmlns:Controls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Input.Toolkit"
>
<dxb:BarManager x:Name="barManager1" ToolbarGlyphSize="Small">
and here is a part of the mainPage xaml reusing this userControl:
<TabControl Width="{Binding Width, ElementName=gridFields}">
<TabItem Header="Résumé">
<controls:richTextSummary></controls:richTextSummary>
</TabItem>
<TabItem Header="Fin"/>
</TabControl>
The problem is that in my userControl, I define a component which is given a name (rater) and I initialize this component in the mainpage code behind (in its constructor):
rater.Value=2;
It seems that when the constructor is called, the code is not injected and parsed...
Have you got a idea to solve this?
Maybe just a copy&paste error but I noticed that you are missing the namespace-declaration for the DevExpress-Bars assembly! Could that be the cause of your problem?
xmlns:dxb="http://schemas.devexpress.com/winfx/2008/xaml/bars"
I'm defining an application resource in my app that stores my ViewModels with a navigation element to navigate pages. This is working fine in the xaml editor of visual studio since all the data bindings are working there. However when I try to run the application in debugger it trows an Exception with the message Cannot find source with the name ViewModelLocator. Does anyone know what is going wrong?
I have a local resource defined in my App.xaml like this:
<Application.Resources>
<viewmodel:ViewModelLocator x:Key="ViewModelLocator"/>
</Application.Resources>
Which i try to use like this:
<Page x:Class="QardPrint.PageEmployeesList"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:QardPrint"
xmlns:viewmodel="clr-namespace:QardPrint.ViewModel"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300"
Title="PageEmployeesList"
DataContext="{Binding EmployeesListViewModel, Source={StaticResource ViewModelLocator}}">
My ViewModelLocator class looks like this
public class ViewModelLocator
{
public EmployeesListViewModel EmployeesListViewModel => new EmployeesListViewModel(App.Navigation);
}
Try to use ResourceDictionary:
App.xaml:
<Application xmlns:viewmodel="clr-namespace:QardPrint.ViewModel">
<Application.Resources>
<ResourceDictionary>
<viewmodel:ViewModelLocator x:Key="Locator" />
QardPrint.PageEmployeesLis.Xaml:
<Page x:Class="QardPrint.PageEmployeesList"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:QardPrint"
xmlns:viewmodel="clr-namespace:QardPrint.ViewModel"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300"
Title="PageEmployeesList"
DataContext="{Binding EmployeesListViewModel, Source={StaticResource Locator}}">
I Found the problem. It was in the App.xaml I deleted the startup parameter. After adding it again the problem was solved.
I did this because I made another window in the startup function of app.cs. But this is probably bad design anyway so going to figure out how to do it better.
I am making a video game, where each grid serves as game room. Each grid\room has a large number of objects like things that can be used, images and sound files. Until now, they all were stored in one large file. But now, I was told that this approach wastes a lot of resources.
My plan is, to store xaml code of every such grid as a separate file, then load relevant file at run time with usual code.
For now xaml looks about like this:
<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d" x:Name="wdwMain" x:Class="RealityIncognita.MainWindow"
Height="900" Width="1600" ResizeMode="NoResize" WindowState="Maximized"
Cursor="Cross" WindowStyle="None" Loaded="wdwMain_Loaded">
<Viewbox Stretch="Fill">
<Grid x:Name="areaContainer" HorizontalAlignment="Left" Height="900"
VerticalAlignment="Top" Width="1600">
<Grid x:Name="areaMain">
<Grid.Background>
<ImageBrush
ImageSource="Resources/Images/Interface/main_interface.jpg"/>
</Grid.Background>
<Grid x:Name="areaShowers" HorizontalAlignment="Left" Height="700"
Margin="1653,790,-1561,-590" VerticalAlignment="Top" Width="1508"
IsVisibleChanged="areaShowers_IsVisibleChanged">
Here's example - areaShowers is a grid for relevant room. Until now, it was stored in the main file, like all other grids, and when I needed, I just altered its Margin to put it upon "areaMain" - also a grid.
Now though, I want to put each room into a file, then load it when I need it, and remove it from memory when I don't.
For example I'll create an empty grid "areaGeneric" and add it and it alone to original xaml.
So, I want something like this. Can't provide any earlier attempt, because I don't really know how it can be done.
Grid new_grid = new Grid;
new_grid = load from file (areaRoom.xaml); (file is among the project's
resources)
areaGeneric = new_grid;
Can I load a grid xaml at run-time, then switch grids in main code?
Thank you,
Evgenie
A really simple solution would just be to house each of your rooms inside a user control and then place the control into your container grid when you need to change rooms. Here's the rough idea:
public partial class MainWindow : Window
{
UserControl _currentRoom;
public MainWindow()
{
InitializeComponent();
}
protected override void OnPreviewMouseDown(MouseButtonEventArgs e)
{
this.areaContainer.Children.Clear();
_currentRoom = null;
if (e.LeftButton == MouseButtonState.Pressed)
_currentRoom = new Room1();
if(e.RightButton == MouseButtonState.Pressed)
_currentRoom = new Room2();
this.areaContainer.Children.Add(_currentRoom);
base.OnPreviewMouseDown(e);
}
}
A "Room":
<UserControl x:Class="Test.Room1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300">
<Button Height="100" Width="100">
Hello world!
</Button>
</UserControl>
As for cleaning up your resources - once the user control is removed from the visual tree (assuming you aren't holding a reference) the GC should dispose of the user control. If you wanted to clear your resources more quickly you could implement a dispose method on your rooms and then call that before you change areas.
having some troubles with UserControl. I cannot get rid of "Content is set more than once error"
From what I've read, the common cause is that .. well, content is set more than once. For example having more than one child or setting content via Content=".." and then specifying another content between the tags.
However, this is UserControl generated by VisualStudio and I made no changes to the xaml.
<UserControl x:Class="TMEGadget.View.Toolbox"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300">
<Grid>
</Grid>
</UserControl>
Got any tips?
P.S: Can anyone tell me why, when I try to type "Hey,\n\nSome text...", the "Hey,\n\n" is deleted?
Edit: Restarting VS fixed the problem , thanks #Bolu
According to MSDN, Silverlight static resources lookup mechanism should:
The lookup behavior for a StaticResource starts with the object where the actual usage is applied, and its own Resources property. (...) The lookup sequence then checks the next object tree parent. (...) Otherwise, the lookup behavior advances to the next parent level towards the object tree root, and so on.
That's pretty straightforward, as it narrows down to simply traversing objects graph until requested resource key is found. One might assume, this would therefore work:
<UserControl x:Class="ResourcesExample.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:ResourcesExample="clr-namespace:ResourcesExample"
mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="400">
<UserControl.Resources>
<SolidColorBrush Color="Green" x:Key="GreenBrush"/>
</UserControl.Resources>
<Grid x:Name="LayoutRoot">
<ResourcesExample:Tester />
</Grid>
</UserControl>
<UserControl x:Class="ResourcesExample.Tester"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="400">
<Grid x:Name="LayoutRoot">
<TextBlock Text="Show green!" Foreground="{StaticResource GreenBrush}"/>
</Grid>
</UserControl>
Well it doesn't. What I get instead is XamlParseException : Cannot find a Resource with the Name/Key GreenBrush.
Am I missing something obvious here or documentation is incorrect?
That's because before inserting the child UserControl in the mother UserControl, it has to be fully instantiated, and since it doesn't know its parent just yet, it doesn't know about the SolidColorBrush.
If you put the SolidColorBrush in your Appl.xaml's Resources section, it will work: App.xaml is loaded at application startup, and any resource you put in there will be globally available.
That said, you could also expose a InnerTextForeground Dependency Property in the child UserControl, and set it to your local SolidColorBrush resource in the parent UserControl.
It's not very difficult but let me know if you have trouble doing so.