Lets assume my XAML is defined as below with my imported namespace in mycontrols.
<Grid x:Class="LayoutGrid"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:sys="clr-namespace:System;assembly=mscorlib"
xmlns:mycontrols="clr-namespace:Predefined.Controls;assembly=UIControls"
>
If i was to use something defined in the namespace Predefined.Controls then i would simply reference it with its alias mycontrols
Example:
<mycontrols:MyCustomButton Name="SubmitButton" />
Now if the namespace Predefined.Controls.CustomTextBoxes also existed, is there a way to use a control inside this namespace without having to add it to the XAML definition at the top?
Something like this??
<mycontrols.CustomTextBoxes:MyCustomTextBox Name="TextBox1" />
No. In XML, the namespace prefix defines the namespace, you can't just tack things onto it. You'll need to add the full CLR namespace as an XML namespace declaration in a parent element:
xmlns:ctb="clr-namespace:Predefined.Controls.CustomTextBoxes;assembly=UIControls"
And use that prefix in when you instantiate that element/control in your XAML:
<ctb:MyCustomTextBox />
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
My problem is distinct from this other question Enforce Global Namespace in XAML in that I don't have a class with the same name as the enclosing namespace, yet I couldn't think of a more appropriate title that would differentiate the two.
If any part of my XAML object's namespace is also the root of another namespace, Visual Studio seems to prefer my XAML object's namespace, which manifests as a compiler error.
Here is an example that shows how part of my namespace WpfApp1.System.Views clashes with global::System:
<Window x:Class="WpfApp1.System.Views.MainWindow"
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"
Title="MainWindow" Height="350" Width="525">
<Grid>
<!-- Amazing content goes here -->
</Grid>
</Window>
There are compilation errors shown in the Errors pane and obj/System/Views/MainWindow.g.i.cs shows this with a squiggly red underline under the System part of System.Windows.Window:
namespace WpfApp1.System.Views {
public partial class MainWindow : System.Windows.Window {
// ...
}
}
Obviously my toy example only stops me from having a System namespace anywhere in my hierarchy, but it also stops me from having any 3rd-party names (like DevExpress) if I'm using one of those 3rd-party components in XAML.
Without renaming either my own namespace (or the referenced components' namespaces) can I ask Visual Studio to use global:: namespaces in its generated XAML code?
In FluentRibbon project, the XAML file contains:
<Fluent:RibbonWindow xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
I know that RibbonWindow is a class (derived from WPF Window class). It's the Fluent: prefix that I don't understand.
The same type of construct is also used by MahMetro like so:
<Metro:MetroWindow x:Class="FluentTest.MahMetroWindow"
What does the prefix signify in the above cases?
That's the namespace those controls/types live in. Some namespaces are included automatically when Xaml is converted to C#, but anything new that you bring in (either from 3rd party libraries or your own application) has to be explicit.
<UserControl xmlns:customControls="using:MyNamespace.CustomControls"
... more declarations ...
<customControls:MySpecialPanel />
</UserControl>
I have Content directory in main solution.
In content catalog i have two catalogs: ViewModels and Views
In XAML, i have declared:
xmlns:vm ="clr-namespace:AppName.Content"
now, i want get reference to some class in ViewModel catalog:
<DataTemplate DataType="{x:Type vm:LaserPathViewModel}">
I know thats wrong because the namespace of LaserPathViewModel is AppName.Content.ViewModels.
But how get this reference without add next one namespace declaration?
You don't. You have to declare that other namespace. One way to do that is by adding another namespace declaration:
xmlns:vm2 ="clr-namespace:AppName.Content.ViewModel"
And then you can use it like this:
<DataTemplate DataType="{x:Type vm2:LaserPathViewModel}">
But there is another way to declare the namespaces. You can use the XmlnsAttribute which allows you to map multiple .NET namespaces to one X(A)ML namespace. You can find some nice explanation here.
All, I have a user control. In the XAML markup for this control I want to define a resource (instatiate an object called cellColorConverter of the class CellColorConverter which is defined in the same namespace as the control. I have
<UserControl x:Class="ResourceStudio.Resource.Resource"
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" Height="331.2" Width="340">
<UserControl.Resources>
<ResourceStudio.Resource:CellColorConverter x:Key ="cellColorConverter"/> // <- Error.
</UserControl.Resources>
This is giving a compile-time error saying
The namespace prefix ResourceStudio.Res is not defined.
What am I doing wrong here?
Thanks for your time.
Update: I now have
xmlns:local="clr-namespace:ResourceStudio.Resource;assembly=ResourceStudio"
mc:Ignorable="d" Height="331.2" Width="340">
<UserControl.Resources>
<local:CellColorConverter x:Key ="cellColorConverter"/>
</UserControl.Resources>
The CellColorConverter class is in the name space ResourceStudio.Resource, defined as
namespace ResourceStudio.Resource
{
public class CellColorConverter : IMultiValueConverter
{
// ...
}
}
I still get the following error
The name "CellColorConverter" does not exist in the namespace "clr-namespace:ResourceStudio.Resource;assembly=ResourceStudio". F:\Camus\ResourceStudio\ResourceStudio\ResourceStudio\Resource\Resource.xaml
In the XAML:
<ResourceStudio.Resource:CellColorConverter />
The ResourceStudio.Resource is an XML namespace for CellColorConverter.
You need to map this XML namespace to a .NET namespace:
<UserControl xmlns:ResourceStudio.Resource="clr-namespace:ResourceStudio.Resource;assembly=ResourceStudio" ... />
The actual namespace and assembly name depend upon what you've called them in your code.
This article provides more information.
Also, you can make the namespace shorter:
xmlns:local="clr-namespace:..."
<local:CellColorConverter ... >