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I have quite a huge WPF application with a lot of XAML files. Every single XAML file has from 5 to 10 clr to xml namespace mappings xmlns:abc="clr-namespace:Abcdef".
It looks awful and is a pain to write in each and every file.
Is there a way to define those globally?
772
A XAML namespace is really an extension of the concept of an XML namespace. The techniques of specifying a XAML namespace rely on the XML namespace syntax, the convention of using URIs as namespace identifiers, using prefixes to provide a means to reference multiple namespaces from the same markup source, and so on.
A XAML namespace is a specialized XML namespace, just as XAML is a specialized form of XML and uses the basic XML form for its markup. In markup, you declare a XAML namespace and its mapping through an xmlns attribute applied to an element.
The xmlns attribute specifically indicates the default XAML namespace. Within the default XAML namespace, object elements in the markup can be specified without a prefix.
XML Namespaces - The xmlns Attribute When using prefixes in XML, a namespace for the prefix must be defined. The namespace can be defined by an xmlns attribute in the start tag of an element. The namespace declaration has the following syntax. xmlns:prefix="URI".
There is no way to define them globally across files. This is a limitation of XML; XAML is a subset of it.
However you can clean them up a bit using XmlnsDefinition
See this article: http://zachbonham.blogspot.com/2010/04/organize-xaml-namespace-declarations.html
If you started with this XAML:
<UserControl
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:treeView="clr-namespace:MaryKay.SamPortal.Common.UI.TreeView.Views;assembly=MaryKay.SamPortal.Common.UI"
xmlns:infoBar="clr-namespace:MaryKay.SamPortal.Common.UI.InfoBar.Views;assembly=MaryKay.SamPortal.Common.UI">
<infoBar:InformationBar DataContext="{Binding InfoBar}"/>
</UserControl>
And added these XmlnsDefinition attributes:
[assembly: XmlnsDefinition("urn:marykay-samportal-common-ui", "MaryKay.SamPortal.Common.UI.InfoBar.Views")]
[assembly: XmlnsDefinition("urn:marykay-samportal-common-ui", "MaryKay.SamPortal.Common.UI.RoleGroupPicker.Views")]
[assembly: XmlnsDefinition("urn:marykay-samportal-common-ui", "MaryKay.SamPortal.Common.UI.BetterPopup")]
[assembly: XmlnsDefinition("urn:marykay-samportal-common-ui", "MaryKay.SamPortal.Common.UI.TextEditor")]
[assembly: XmlnsDefinition("urn:marykay-samportal-common-ui", "MaryKay.SamPortal.Common.UI.Converters")]
[assembly: XmlnsDefinition("urn:marykay-samportal-common-ui", "MaryKay.SamPortal.Common.UI.Documents")]
[assembly: XmlnsDefinition("urn:marykay-samportal-common-ui", "MaryKay.SamPortal.Common.UI.SplashScreen")]
[assembly: XmlnsDefinition("urn:marykay-samportal-common-ui", "MaryKay.SamPortal.Common.UI.TemplateSelector")]
[assembly: XmlnsDefinition("urn:marykay-samportal-common-ui", "MaryKay.SamPortal.Common.UI.ModalDialog")]
[assembly: XmlnsDefinition("urn:marykay-samportal-common-ui", "MaryKay.SamPortal.Common.UI.ConsultantSearch.Views")]
// etc...
You could end up with this XAML instead:
<UserControl
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:commonUI="urn:marykay-samportal-common-ui">
<commonUI:InformationBar DataContext="{Binding InfoBar}"/>
</UserControl>
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