CODEWITHSUNDEEP
c#visual-studio-2017uwp-xaml
rzippo
rzippo

Reputation: 1049

"The name does not exist in the namespace error" in XAML

I know this is a recurring error but I can't seem to get around it. Intellisense does recognize the name of my custom control and suggests to add the proper using: directives, but not only XAML designer doesn't find the name of the control but I can't get through compilation either.

The custom control is a public class defined as

namespace MyApp.CustomControls
{
    public class CustomTextBox : TexBox
    {
        ...
    }
}

And in my MainPage.xaml

<Page ...
xmlns:customControls="using:MyApp.CustomControls">
      ...
      <customControls:CustomTextBox/>
      ...
</Page>

This does not render in design nor compile. This answer and the ones below are not working for me.

The error message:

Error XDG0008 The name "CustomTextBox" does not exist in the namespace "using:MyApp.CustomControls".

Upvotes: 4

Views: 8952

Answers (3)

John Christopher Linstrum
John Christopher Linstrum

Reputation: 433

I got a version of this error in my embedded UserControl when I tried to use the Name property in my XAML instead of using x:Name. In other words, when my XAML code looked like this:

myUserControls="using:MyUserControls"

<myUserControls:GraphCanvas Name="GraphCanvas" />

I got an error that 'The name "GraphCanvas" does not exist in the namespace "using:MyUserControls"'. When I changed one line of code to this:

<myUserControls:GraphCanvas x:Name="GraphCanvas" />

Everything built just fine.

I'm dropping this solution here because it took me about a day and a half to figure out this problem and this was the only stackoverflow page I found when I searched the error string. Hopefully I will save someone else the hassle I went through.

Upvotes: 0

ury
ury

Reputation: 1160

I've seen quite a lot solutions saying that you should rebuild the project, restart Visual Studio or restart the machine. What worked for me was specifying the assembly in the namespace reference, that is: xmlns:the_namespace="clr-namespace:the_namespace" - produces the above error. xmlns:the_namespace="clr-namespace:the_namespace;assembly=the_assembly" - works well.

Upvotes: 0

Breeze Liu - MSFT
Breeze Liu - MSFT

Reputation: 3808

Your code should works well after you build the project, and it works well in my side using your above code. Try to clean your solution or delete the bin and obj folders in your project then rebuild your app again. Also try to restart your Visual Studio. If it still happens, you can provide a reproducible sample to help me look into this issue.

Upvotes: 2

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