I'm building an WPF (C#) application and I want to add a namespace to a XAML code (string type). I want to add the namespace on the correct place. Can anyone help me? Thanks, Peter.
EDIT:
It's a XAML code saved in a string like:
<UserControl x:Class="MyTestApp"
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"....
I want to add a new namespace (like xmlns:test="http://www.test.nl") on the correct place.
As you have the XAML in one string, and presumably you have a second string containing the new namespace declaration, it seems that you simply need to use string.Insert to place it in. Your code would be as simple as this:
string xamlString = "... get some xaml from somewhere ...";
int insertPosition = xamlString.IndexOf(">");
xamlString.Insert(insertPosition, "my new namespace");
So I just get the index of the first closing angle bracket, and insert the new namespace right there.
Related
I made a project where it was one page only, then after I made everything decided to go back in and make a second page, which was a huge mistake because now I have 50 compiler errors. In my new page's code behind, I cannot access any control by name and the page cannot access any event handlers in the code-behind. Here is an example:
Autoclicker.xaml
<Page x:Class="_1337clicker.Pages.Autoclicker"
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:_1337clicker.Pages"
mc:Ignorable="d"
d:DesignHeight="450" d:DesignWidth="800"
Title="Autoclicker">
<Grid>
<Button Name="hi"/>
</Grid>
</Page>
Autoclicker.xaml.cs
using System.Windows;
using System.Windows.Controls;
namespace _1337clicker
{
public partial class Autoclicker : Page
{
public Autoclicker()
{
hi.Content = "hello world"; //The name "hi" does not
//exist in the current context
}
}
}
I think you just messed up classname/namespace.
Check in XAML:
x:Class="_1337clicker.Pages.Autoclicker"
This will generate all the variables related to controls in a class called Autoclicker in a namespace of _1337clicker.Pages
but then, your code-behind class is:
namespace _1337clicker // <---- DIFFERENT NAMESPACE
{
public partial class Autoclicker : Page
You ended up with two 'Autoclicker' classes, one generated from XAML, other writen by you. Correct the namespaces and class names so they are identical, and try again. Generated code will end up in the same class as codebehind, and probably all such errors will go away.
EDIT: also what Joe noticed, it should be x:Name. Just 'Name' will let you find the control with tree walking and/or find-by-name tools, but probably won't generate a variable for code-behind.
I am trying to create my custom control, but I am still getting error: The name "CustomCircleControl" does not exist in the namespace "using:App8"
My app namespace is App8 and class CustomCircleControl exists in it.
Errors appears in file Generic.xaml, but I do not understand why.
<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:App8">
<Style TargetType="local:CustomCircleControl"> -- This line is marked by visual studio as error (The name "CustomCircleControl" does not exist in the namespace), but intelisence knows class CustomCircleControl.
Thank you for any help :-)
You are declaring the namespace incorrectly.
The correct way to declare a namespace in XAML is the following:
xmlns:MyNamespace="clr-namespace:Your.Namespace.Here"
So in your case, it'll look like this:
xmlns:local="clr-namespace:App8"
i have some UserControls that are shown fine in designer, but i can't make any changes to the design-time example content from the constructor. It seems like it is not executed at all.
XAML:
<UserControl x:Class="Example.Test"
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>
<TextBlock Name="testx" Foreground="White" HorizontalAlignment="Center" VerticalAlignment="Center"></TextBlock>
</Grid>
Code:
using System.ComponentModel;
using System.Windows.Controls;
namespace Example
{
/// <summary>
/// Interaction logic for Test.xaml
/// </summary>
public partial class Test : UserControl
{
public Test()
{
InitializeComponent();
if (DesignerProperties.GetIsInDesignMode(this))
testx.Text = " IN DESIGN!";
}
}
}
I've tried many options, but still can't get it how to display design-time data in WPF designer :( Different context binding also shows nothing...
PS: Tried clean VS2012 and VS2013 projects on Win8. NOTHING WORKS! :( I don't know what to do, haven't found anything similar on the net... Is it sufficient to just add design check in constructor and set existent control text? It should work, right?
K, the short answer is: You're on the right path.
The long one is: It's a bit more complicated than that.
Your example will "kinda" work, as in, if you'll put an else testx.Text = RUNTIME; after your if, like that:
if (DesignerProperties.GetIsInDesignMode(this))
testx.Text= " IN DESIGN!";
else
testx.Text= " Runtime";
you'll see what you want on runtime, but you're design time will stay empty.
For the Design time, you also need to set the context if I'm not mistaken.
If you're using any of the MVVM framework out there, you kinda get this functionality for "free". As in, you'll have a "in design time" property and you can set whatever data you want for the design. The catch is that you need to have an empty constructor if my memory serves me right.
You'll also use bindings, and not set the text property directly.
I remember that the default WPF and binding for design time was lacking a bit last time I tried to do something like that in "vanilla" wpf (as in, no MVVM, no bindings), but I believe that with a bit of a hack it's achievable. Again, can't remember it from the top of my head.
I'm currently trying to use this TextBox AutoComplete custom control :
http://www.codeproject.com/Articles/26535/WPF-Autocomplete-Textbox-Control?msg=3484969#xx3484969xx
This is the first time I'm adding such external things in my project and when I add the header line in my Xaml file like explained in the article :
<UserControl x:Class="Maha.Gestion.Note_de_frais.SaisieNoteDeFrais"
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:xctk="http://schemas.xceed.com/wpf/xaml/toolkit"
xmlns:local="clr-namespace:WPFAutoCompleteTextbox"
>
VisualStudio tell me that clr-namespace is not included in the assembly.
I'm sure this is something totally trivial but after few hours still can't find any solution.
All files asked by the author of the article has been added of course.
Someone can explain me the good way to add such external resources ?
Thanks
xmlns stands for XML NameSpace. It basically links a prefix of your choice to a namespace. In your case, it links the local prefix with the namespace declared in the file that you want to use.
You can find out more by looking at the XAML Namespaces and Namespace Mapping for WPF XAML article at MSDN.
Please check that the file that you want to use has this exact namespace declared.
Please remove all white space from your xmlns declarations - you may have extraneous characters hidden there.
Like this:
xmlns:xctk="http://schemas.xceed.com/wpf/xaml/toolkit"
xmlns:local="clr-namespace:WPFAutoCompleteTextbox">
I feel like I must be going crazy, but I just changed the name of a property in a view model (a C# file) from Width to Size using Visual Studio's refactor-rename feature. When I was done, this error appeared in the Error window:
Error 2: The property 'Size' does not exist in XML namespace 'http://schemas.microsoft.com/winfx/2006/xaml/presentation'.
The error was referring to a XAML UserControl file. When I checked the file to see what was up, I realized that every attribute named Width had been changed to Size.
Example:
<UserControl x:Class="ApbSymbolGenerator.Views.Symbol"
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"
Size="{Binding Size}"
Height="{Binding Size}">
This is the first time I've ever had refactor-rename cause a change to a XAML file (besides the x:class value). (Note: I did not do a global find/replace, I did refactor-rename. I undid everything and performed the rename again, and it did the same thing.)
Strangely, it only affected one of several XAML files in my app that has a Width property.
Any explanation what could be going on here?
Looks like this is a bug (that won't be fixed) - Refactor Rename Bug