I am working on a WPF main window and I am using a list box, and I want the list box to auto-scroll whenever new data is added. I used the ListBoxBehavior class in the chosen answer for this question, and I added the following namespaces for the that class in my code:
using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Windows;
using System.Windows.Controls;
using System.ComponentModel;
Also, in my XAML, I added the following:
<ListBox x:Name="IncomingData" FontSize="20" Grid.Column="1" Margin="10,10,10,0" Grid.Row="3" ItemsSource="{Binding SourceCollection}" lb:ListBoxBehavior.ScrollOnNewItem="true"/>
However, I am getting the following three errors in my XAML code regarding that line, and they are as following:
Error XDG0006 The namespace prefix "lb" is not defined.
Error XDG0008 ListBoxBehavior is not supported in a Windows Presentation Foundation (WPF) project.
Error XLS0415 The attachable property 'ScrollOnNewItem' was not found in type 'ListBoxBehavior'.
I tried creating an object of a ListBox type ListBox lb = new ListBox(); in the ListBoxBehavior class, but that didn't change the situation. Also, ScrollOnNewItem already exists in the class, so why is it not identifying it?
Is there a missing step that I should have done?
Any help is much appreciated!
you need to define the lb namespace before using it.
at the top of your xaml file you ought to see xmlns:x="...". notice you are using it with x:Name.
same goes for lb. you need to define xmlns:lb="...". intellisense should help you fill in the "...".
notice xmlns means xml namespace.
that ought to clear up all 3 errors.
Related
Well, I'd like to use a class of a namespace in my Mainwindow.xaml
Image
As you see the namespace called WPF.Tools
Now I create a local at the top to the XAML
xmlns:webutil="WPF.Tools"
And in the Grid I have a WebBrowser where I'd like to use a a method of the class of the namespace:
<WebBrowser webutil:WebBrowserBehaviors.BindableSource="{Binding SelectedRSSFeed.Link}" Grid.Column="1" Margin="10,10,10,10" Grid.RowSpan="3" Grid.Row="0"/>
If I hover over it it says: The name "WebBrowserBehaviors" does not exist in the namespace "WPF.Tools".
I also added a Project Reference so I don't think this is the Problem
Your reference seems wrong.
It should be:
xmlns:webutil="clr-namespace:WPF.Tools;assembly=WPF.Tools
I am fairly new to WPF and I am having a problem with inheriting from a user control.
I created a User Control and now I need to inherit from that control and add some more functionality.
Has anyone does this sort of thing before? Any help would be greatly appreciated.
Thank you
Well .. you create your base control
public abstract class BaseUserControl : UserControl{...}
then in the XAML file :
<Controls:BaseUserControl x:Class="Termo.Win.Controls.ChildControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:Controls="clr-namespace:Namespace.Of.Your.BaseControl">
And that should work.
EDIT: Hmm.. this example is useful when you have a base control without XAML and then inherit from it. The other way around(from a base control with Xaml) - I'm not sure how you can go about it.
EDIT2: Apparently from this post + comments i take that what you want might not be possible.
AFAIK you cannot inherit the xaml, you can only inherit the code behind.
We recently encountered the same problem on our project. The way we ended up solving our problem was to create a usercontrol and adding it to the "child" usercontrol.
If that doesnt work/help take a look at this:
https://web.archive.org/web/20200815091447/http://geekswithblogs.net/lbugnion/archive/2007/03/02/107747.aspx[1]
I may have a bit of a solution: Composition instead of inheritance - I have come up with control, that has 'content slots' assignable from outside through databinding, look at my SO thread.
Example of use:
<UserControl ... >
<!-- My wrapping XAML -->
<Common:DialogControl>
<Common:DialogControl.Heading>
<!-- Slot for a string -->
</Common:DialogControl.Heading>
<Common:DialogControl.Control>
<!-- Concrete dialog's content goes here -->
</Common:DialogControl.Control>
<Common:DialogControl.Buttons>
<!-- Concrete dialog's buttons go here -->
</Common:DialogControl.Buttons>
</Common:DialogControl>
<!-- /My wrapping XAML -->
</UserControl>
Together with some handling code in codebehind it would be a nice base component for dialog windows.
You cannot inherit the xaml code it self. However creating an abstract class of the codebehind, will allow you to edit in code behind, from a derived class object.
Xaml Code: { Window1.xaml }
<Window
x:Class="WPFSamples.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Height="auto" Width="256" Title="WPF Sameples">
<Grid>
<Button x:Name="Button1" VerticalAlignment="Center" HorizontalAlignment="Center" Content="Click Me"/>
</Grid>
</Window>
CodeBehind: { Window1.xaml.cs }
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace WPFSamples
{
/// <summary>
/// Interaction logic for Window1.xaml
/// </summary>
public abstract partial class Window1 : Window
{
public Window1()
{
InitializeComponent();
}
}
}
Derived Class : { DisabledButtonWindow.cs }
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace WPFSamples
{
public sealed class DisabledButtonWindow : Window1
{
public DisabledButtonWindow()
{
Button1.IsEnabled = false;
}
}
}
although you cannot inherit from the wpf source it self, you are able to use this "Window1" control as a template for all other derived controls.
You can accomplish this by using a delegate.
Essentially, you need to create an interface (YourInterface) which wraps up the functionality you want, then make both the user control and your class implement that interface.
Next, make sure the user control has a reference to an object of type IYourInterface, so that when your user control attempts to invoke a method of the Interface, it calls your class' method.
Because both the user control and class implement the same interface, they can be seen as the same kind of object - meaning you can put them both into a collection of objects of type IYourInterface. This should give you the behavior you want.
In ASP.NET I use this technique often, by having my classes inherit from abstract class ancestors. I don't understand why WPF doesn't support this. :(
I think that you can do this but that you will have to redefine any functions and possibly some other stuff that you reference in the xaml in the child class.
IE if you have a button click event that you subscribe to in the base class xaml you will need override the button click in the child class and call the base class button click event.
Not one hundred percent sure of the the details since it's my coworkers code that I'm drawing from but thought this would give a start to anyone looking to implement this in the future.
Hi I'm trying to learn a bit of WPF and C# for a project I'm working on. I realised after working for a while that I was going to use couple of the same item and I thought it would be fitting to create my own class to make it easier to use. However now I can't reference elements defined in the XAML in the code behind like I could when just doing it in a window. The error I get is "Cannot resolve symbol 'ThaButton" in the ContactPanel.xaml.cs:
using System.Windows.Controls;
namespace WPF_OOM
{
public partial class ContactPanel : ContentControl
{
public Contact Person { get; set; }
public ContactPanel()
{
ThaButton.Content = "test";
}
}
}
My ContactPanel.xaml
<UserControl x:Class="WPF_OOM.ContactPanel:UserControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<DockPanel x:Name="dp">
<TextBlock x:Name="NameTextBlock" Text="testtesttest" DockPanel.Dock="Left"></TextBlock>
<Button x:Name="ThaButton" Content="button" DockPanel.Dock="Right"></Button>
</DockPanel>
</UserControl>
Hopefully I've explained my problem well enough. I might have taken the wrong approach to this problem, let me know if there's a better way.
Cheers
Remove :UserControl from x:Class="WPF_OOM.ContactPanel:UserControl" so it looks like x:Class="WPF_OOM.ContactPanel"
Also in your code behind you have the ContactPanel inheriting form ContentControl, but in your xaml it inherits from UserControl. These base classes must match. So change them both to be UserControl or ContentControl
It looks like you created a separate .cs file? I would recommend working with the code behind generated with the xaml file. One way to get to it is in the xaml editor right-click and choose 'View code'. If you imported the xaml and .cs file then reloading the project or restarting visual studio should combine them again in solution explorer if they are not already.
I would suggest looking into the Model-View-ViewModel or MVVM pattern. It works rather nice with WPF ;)
Hope this helps get you started.
<d3:Chart BottomTitle="Argument" LeftTitle="Function">
<d3:LineGraph x:Name="linegraph" Description="Simple linegraph" Stroke="Blue" StrokeThickness="3"/>
</d3:Chart>
This code is on the Home Page of the Dynamic Data Display. I downloaded .dll file and added the reference. Then I add those lines of code shown on the home page to my MainWindow.xaml
I get these errors;
'd3' is an undeclared prefix.
Chart is not supported in a Windows Presentation Foundation (WPF) project.
The namespace prefix "d3" is not defined.
I have no other code to show. This is the whole code because I was at the beginning.
Should I do something with this DynamicDataDisplay.XML file too? I didn't use it so far.
Try add this namespace to your Window/UserControl:
xmlns:d3="http://research.microsoft.com/DynamicDataDisplay/1.0"
in Wpf you have to use "ChartPlotter" instead of "Chart". Chart is only supported in Silverlight.
I'm trying to use a CallMethodAction bound to a control in a WPF Window, using the method from the Prism library samples and documentation. For some reason, the XAML compiler refuses to acknowldge that the Microsoft.Expression.Interactivity.Core namespace even exists. However, I have no problem using the same classes from the same namespace in the code-behind for that view.
In XAML I've tried both the canonical namespaces:
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
xmlns:ic="http://schemas.microsoft.com/expression/2010/interactions"
as well as the CLR namespace:
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
xmlns:ic="clr-namespace:Microsoft.Expression.Interactivity.Core;assembly=Microsoft.Expression.Interactions"
The namespace Intellisense pop-up browser displays the first namespace but neither the XML nor CLR namespaces for the second. In either case, the following XAML fails to compile:
<Button HorizontalAlignment="Right" Content="Cancel">
<i:Interaction.Triggers>
<i:EventTrigger EventName="Click">
<ic:CallMethodAction />
</i:EventTrigger>
</i:Interaction.Triggers>
</Button>
It has no problem finding the Interaction.Triggers tag, but complains that the CallMethodAction tag doesn't exist in the specified namespace. In fact, Intellisense on the ic namespace tag acts as if there is no such namespace. However, I do not get the error that the CLR namespace could not be found, which I do if I try to use a non-existant namespace.
However, in the constructor for this window, I can do this:
var x = new Microsoft.Expression.Interactivity.Core.CallMethodAction();
That compiles and runs fine. How is that even possible?
Try removing and re-adding reference to Microsoft.Expression.Interactions.dll and *.Interactivity.dll
It happened to me once but I don't know why. This is the way I solved it.