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Hello!
I'm training on Microsoft Learn. My current stage is the following module:
First of all, this exercise starts saying that it uses the .NET 6.0 SDK. However, the instructions given on it are all for .NET 8.0 SDK.
I strictly followed the instructions for four times, initially using .NET 8.0 SDK, then tried with .NET 6.0 SDK (it wasn't possible to create a new blazor app with the option -f net6.0) and all times got the same problem showed below:
I've successfully made the reference to FirstClassLibrary as instructed.
It seems that there's some problem on this exercise's instructions. Maybe lacking some step.
I appreciate in advance any help given.
Thank you!
Rafael Elias.
This question is related to the following Learning Module
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(211.20000000000002, 61%, 30%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EBS%3C/text%3E%3C/svg%3E)
you seem to have missed the step:
dotnet add reference ../FirstClassLibrary
in the blazer project folder, or the folders are not siblings.
note: I did the tutorial on my Mac with net 8, took a couple minutes and ran the first time.
Hello Bruce! Nice to meet you! How are you doing? I'm good.
Thanks for your answer and help!
Could you please send me a print screen of your folders?
Because, thinking about the OS, I also tried the tutorial on my Linux Ubuntu and got the same problem.
My folders are as follows:
With this configuration I accomplished the step you mentioned (even at the first time I got the error), but still not working.
Thank you again.
sure:
% ls -l
total 8
drwxr-xr-x 10 bruce staff 320 Apr 24 09:16 FirstClassLibrary
drwxr-xr-x 11 bruce staff 352 Apr 24 09:15 MyBlazorApp
-rw-r--r-- 1 bruce staff 1609 Apr 24 09:15 testRazorLib.sln
% more MyBlazorApp/MyBlazorApp.csproj
<Project Sdk="Microsoft.NET.Sdk.Web">
<ItemGroup>
<ProjectReference Include="..\FirstClassLibrary\FirstClassLibrary.csproj" />
</ItemGroup>
<PropertyGroup>
<TargetFramework>net8.0</TargetFramework>
<Nullable>enable</Nullable>
<ImplicitUsings>enable</ImplicitUsings>
</PropertyGroup>
</Project>
% more MyBlazorApp/Components/_Imports.razor
@using System.Net.Http
@using System.Net.Http.Json
@using Microsoft.AspNetCore.Components.Forms
@using Microsoft.AspNetCore.Components.Routing
@using Microsoft.AspNetCore.Components.Web
@using static Microsoft.AspNetCore.Components.Web.RenderMode
@using Microsoft.AspNetCore.Components.Web.Virtualization
@using Microsoft.JSInterop
@using MyBlazorApp
@using MyBlazorApp.Components
@using FirstClassLibrary
note: remember namespace names are case sensitive. be sure you got then correct
Hi Bruce! Thank you for sending me the information above.
Our codes are identical, but unfortunately I'm getting the same error (CS0246). The folders "FirstClassLibrary" and "MyBlazorApp" are side by side inside another folder "DotNetBlazor" in my C:\ directory. Also the reference to the FirstClassLibrary is correctly made.
Thank you once again for trying to help me with this issue.
for dotnet projects the default namespace is based on the project file name.
if you included the FirstClassLibrary project reference, then I would guess you did not name of the FirstClassLibrary.csproj correctly (casing), and the default namespace is wrong. you can fix this. in the Modal.razor file, add as first line:
@namespace FirstClassLibrary
also check the namespace in ExampleJsInterop.cs
note: you can also define the default namespace in the project file:
<PropertyGroup>
<RootNamespace>My.Namespace</RootNamespace>
</PropertyGroup>
All checked as you recomended me. The error is gone. As everything was already correct, it seems the error was gone with the action of shutting the VS Code down and then restarting it. The system compiles and run. Actually weird as it was, the system was already compiling and running correctly regardless the error mentioned (CS0246). But in the browser I got this error (the same as when trying to run regardless the error):
looks like you are using the old omnisharp tools. you should be using C# dev tool. be sure the correct program.cs is selected, then debug. c# -> MyBlazorApp (no launch file required).
I finally and successfully ran the solution, Bruce. The last error was because instead of adding the code to Home.razor file I was overwritting the existing code. What a rookie lack of attention. I apologise for that. Notwithstanding this, your help was very very useful and I appreciate it.
Thank you for your insights!
Cheers
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(230.39999999999998, 8%, 32%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EC%3C/text%3E%3C/svg%3E)
I ran into the same issues. I ran through the steps more than 4 times and always had an issue with "using" statement on the _Imports.razor file. I tried using only the command line commands, setting up projects as GUIs, saving the projects on my local computer and not my attached cloud storage provider, closing Visual Studio in between creating projects and saving edits, plus the suggestions listed on this page. I have been using Visual Studio (not Code) as that is what my school encourages us to use.
I found that I was able to get a success message using the command line in Visual Studio about a successful reference if I used the following syntax:
dotnet add [path to FirstClassLibrary.csproj] reference [path to FirstClassLibrary folder]
Unfortunately, I still continued to have errors with the _Imports.razor file.
I decided to run through the steps above using the terminal commands and Visual Studio Code to see if I got a different outcome and got it to work on my first try.
I thought I'd mention my success here in case anyone else has a similar issue. I'm still not sure why it works in Visual Studio Code and not Visual Studio, but at least I got it to finally work!