Error in a .g.cs file?

user_485098 0
Viewed 60351
Error   1   The type or namespace name 'BreadcrumbLib' could not be found (are you missing a using directive or an assembly reference?) YOU_CAN'T_KNOW_THE_PATH_OR_NAME.g.cs    16  7   someWPFapp

And the troublesome line is:

using BreadcrumbLib;

Yesterday I have removed that project (BreadcrumbLib) from my solution and the main project worked fine.
Today it doesn't work.

What can I do about this?
What piece of forsaken information makes Visual Studio or whatever program builds the .g.cs files put that reference there?

build c#
13 Answers

Just got this error message.

None of the answer here solved my issue, but I looked at my warnings message and saw that one of the project was build in .NET 4.7 and the other in 4.5. I put all project on the same version, build and now I'am happy!

user_7795870

I had this issue as well. For me the problem was that a rename didn't go through all the way in the razor files, so the g.cs files kept getting generated with the old name.

I solved it by checking the related .razor file for errors and fixing them manually.

user_42444520

This just happened to me. My issue was that I had spaces in my x:Name. Once I removed the spaces and cleaned the solution it worked fine.

Incorrect

<button Text="Check In" x:Name="Check In">

Correct

<button Text="Check In" x:Name="CheckIn">
user_20737380

I just experienced the same issue,

I had a custom control i created in a nuget, and the generated xmal class just didn't like the namespace involved. It turns the control had a namespace of xxx.yyy.zzz.Name and my project had a namespace in it, eee.fff.yyy... (notice the yyy) it just got completely confused and the only recourse was to refactor the namespaces in the parent app.

user_16129750

My case is a little different. I have a WPF project and I've created a custom Panel like this:

using System;
using System.Windows;
using System.Windows.Controls;

namespace MegaMenu
{
    public class MegaMenu : Panel
    {

My .xaml file looks like this:

<Window x:Class="MegaMenu.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"
        xmlns:local="clr-namespace:MegaMenu"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800"

        >
    <local:MegaMenu>
        <TextBox Width="50" Height="20" Text="First"></TextBox>
        <TextBox Width="50" Height="20" Text="Second"></TextBox>
        <TextBox Width="50" Height="20" Text="Third"></TextBox>
        <TextBox Width="50" Height="20" Text="Fourth"></TextBox>
        <TextBox Width="50" Height="20" Text="Fifth"></TextBox>
        <TextBox Width="50" Height="20" Text="Sixth"></TextBox>
        <TextBox Width="50" Height="20" Text="Seventh"></TextBox>
    </local:MegaMenu>
</Window>

This give's me the error in g.cs file blah blah. So it seems this issue happens when the namespace name is the same as the class name. I have to change them to below which caused the error gone.

.cs file 
using System;
using System.Windows;
using System.Windows.Controls;

namespace MegaMenu
{
    public class MegaMenuPanel : Panel
    {
xaml file 
<Window x:Class="MegaMenu.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"
        xmlns:local="clr-namespace:MegaMenu"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800"

        >
    <local:MegaMenuPanel>
        <TextBox Width="50" Height="20" Text="First"></TextBox>
        <TextBox Width="50" Height="20" Text="Second"></TextBox>
        <TextBox Width="50" Height="20" Text="Third"></TextBox>
        <TextBox Width="50" Height="20" Text="Fourth"></TextBox>
        <TextBox Width="50" Height="20" Text="Fifth"></TextBox>
        <TextBox Width="50" Height="20" Text="Sixth"></TextBox>
        <TextBox Width="50" Height="20" Text="Seventh"></TextBox>
    </local:MegaMenuPanel>
</Window>
user_1709310

In my case , I was tried to name a xaml control using x:Name , and forgot , and kept it as x:Name="" . The compiler was keep on throwing error. Give proper name or remove that empty string solves the error for me.

user_14960140

I was not using WPF but got this error because I forgot to change the namespace in the @inject part of my razor view.

user_9475300

I got this error down grading a .NET 6 project to .NET 4.8.

By default .NET 6 added into my .csproj <ImplicitUsings>enable</ImplicitUsings> which if I removed forced me add the using statements manually which resolved my issue of a phantom using thinking it was needed when it wasn't and couldn't be found.

user_5604760
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