I have a class lib and I referenced it to another windows project. I added its namespace to my Form.cs (using SaglikNetClassLib;). they are seem unknown when I want to access to classes. I can see their properties and methods. But the complier says "Error 7 The type or namespace name 'SaglikNetClassLib' could not be found (are you missing a using directive or an assembly reference?), Do you have any suggestion?
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Are you targeting the .net Client Framework? Visual Studio let's you add references to incompatible assemblies, but then gives exactly that error.
Check your project settings to make sure you're targeting the full .net framework.
Also, check that the Ilalcar class is public and not internal (which is the default if it's only declared as class without any modifier)
You probably need an using statement to put the class into scope.
using SaglikNetClassLib;
C# won't auto suggest it if the project has not been rebuild. Also make sure the class library project has been build before using it in code.
Intellisense seems to lag behind a bit at times. Simply pressing f5 (run) sometimes rebuilds the project completely and simply runs or gives a better error message.
Related
I am trying to go through this tutorial for on making sounds with waves using C#:
https://www.codeguru.com/dotnet/making-sounds-with-waves-using-c/
The first sample code it has you run is this, which is supposed to play a .wav file:
using Microsoft.VisualBasic;
using Microsoft.VisualBasic.Devices;
namespace MyApp
{
class Program
{
static Audio myAudio = new Audio();
static void Main()
{
myAudio.Play("m:\\crooner2.wav",
AudioPlayMode.WaitToComplete);
}
}
}
In my code, the filepath and name of the .wav file was replaced with a different one, but otherwise the code is identical. However, I get an error regarding the second line of code: error CS0234: The type or namespace name 'Devices' does not exist in the namespace 'Microsoft.VisualBasic' (are you missing an assembly reference?)
Without the Microsoft.VisualBasic.Devices call working, I have no way of running even the first exercise in the tutorial, and definitely no way of further progressing in using C# for sound manipulation.
I was expecting the code to run and play the .wav file. However, I got the error message instead.
As part of debugging, I came across this post on the Microsoft website:
https://learn.microsoft.com/en-us/dotnet/core/compatibility/visualbasic#types-in-microsoftvisualbasicdevices-namespace-not-available
I'm not sure what to make of it. It seems like it's saying it could be solved by upgrading to .Net 5 or higher, but I'm already using .Net 5. It also seems like it saying that Microsoft.VisualBasic.Devices was made obsolete with .Net Core 3.0, so I'm not sure how upgrading would make it easier to use something that was made obsolete.
It also says that certain functionality in Microsoft.VisualBasic.Devices has equivalent functionality that can be called by other means. It gives specific replacement calls for Microsoft.VisualBasic.Devices.Clock and Microsoft.VisualBasic.Devices.Ports, but nothing for Microsoft.VisualBasic.Devices.Audio, which is what I want to use in my code.
I have tried this in both Visual Studio and Visual Studio Code and get the same errors either way.
With .NET Core, you generally add references via NuGet packages. There is no NuGet package for Microsoft.VisualBasic.Forms.dll, which the documentation clearly states that type is declared in. To get that assembly reference, I believe that you need to replace this line in your project file:
<TargetFramework>net5.0</TargetFramework>
with these lines:
<TargetFramework>net5.0-windows</TargetFramework>
<UseWindowsForms>true</UseWindowsForms>
After doing that, you should see Microsoft.WindowsDesktop.App.WindowsForms added under Dependencies -> Frameworks in the Solution Explorer and the relevant assembly is listed under that.
You have to use reference to "Microsoft.VisualBasic" in your project.
You have two way for do that :
1st way :
Right click on project references, select "Assemblys" => "Framework" and you can search (at top right) "basic" keyword, and select "Microsoft.VisualBasic" item.
After that you can compile your project and normally its works !
Screen for add references
2nd way :
Comment or delete "using Microsoft.VisualBasic.Devices;" instruction.
The class "Audio" should be underline to red, hover with your mouse and you have option by IDE which let you "using Microsoft.VisualBasic.Devices;".
References should be automatically added in project.
And now you can compile your project.
I create a new solution called "WordpressAutomation"
I create a new project, a class library, called "WordpressAutomation" in this solution
I create a new project, a unit test project, called WordpressTests in this solution
I add a reference to the project WordpressAutomation in the project WordpressTests"
This should be ok, shouldn't it?
However, as can be seen from the screenshot, when adding this using line in a class in the project WordpressTests,
the reference doesn't work. Even though it is there, as can plainly be seen.
When entering "using", the class library "WordpressAutomation" doesn't appear among the alternatives.
And I get this error message when trying to run:
"The type or namespace "WordpressAutomation" could not be found (are you missing a using directive or an assembly reference?)"
Why is this happening? The reference is clearly there?
http://i.stack.imgur.com/L0g5R.png
Your project isn't actually including the .cs files to compile; they are only shown for information (they should appear as solid files with the C# logo):
Right click on these files and include them in the project. Then check what namespace they declare inside them. At the moment, your WordpressAutomation project simply doesn't contain any types.
I have an issue with a class being used in another project.
Visual studio is able to add a using statement using Resolve (Ctrl+.), but:
The type or namespace name 'SomeClass' could not be found (are you missing a using directive or an assembly reference?
Resolving this again fully qualifies the type but the namespace in the type path is highlighted as not being found.
The namespace appears also in intellisense and the target class is visible in the Object Browser.
Removing unused namespaces removes the added using statement.
I've tried:
Rebuild.
Confirm project dependency in solution options.
Delete reference and re-add.
Confirm class accessibility (despite namespace not being found).
Checked build mode (Debug/Release).
Restart Visual Studio.
Cleared bin folders in both projects.
Restart machine.
What is the next step to diagnosing this baffling issue?
This is likely to be a .Net framework versioning issue. The class being referenced was probably built using a higher version of the framework.
Try checking your framework versions all align in properties, build settings. A project cannot reference an assembly of a higher framework version.
Last time I had this problem my class was not marked public. Just an idea.
This issue was caused by similar namespaces e.g. Company.Product.Project and Product.Project with:
namespace Company.Product.Project
{
using Product.Project;
The class was in Product.Project, but the compiler was searching for Company.Product.Project.
See: Should 'using' statements be inside or outside the namespace? for more details.
I have a class library project which uses a namespace (e.g., "Cosmos.Creator.Util"). I then create a solution and windows forms application to test the library. From the windows form application, I add a reference to the library. So now I have two projects open in visual studio, a class library and a windows forms project. The forms project references the library.
When I edit my form's code, code autocompletion works correctly for the namespace that I use in the library. E.g., if I type "using Cosmos." I get autocomplete options like "Creator". But now if I build my solution, all of the "Cosmos" are red-underlined with the compile error: "The type or namespace name "Cosmos" could not be found (are you missing a using directive or an assembly reference?)".
For the purposes of the form application test, I placed my library code into a folder CosmosFormExample\Cosmos. When I check the reference from the form application, the reference is to CosmosFormExample\Cosmos\bin\Debug\Cosmos.dll, so that looks okay. I looked at the GUID referenced in the solution file and it matches the GUID of the project file Cosmos.csproj.
What has happened? How has the build caused my forms application to forget about the Cosmos namespace, despite the fact that it is still referencing the library project? Thanks much in advance.
Are you using VS2010 & .NET 4? If so you're probably using .NET 4 Client Profile instead of full fledged .NET 4. Go to project properties and check your Target Framework.
for more info: http://msdn.microsoft.com/en-us/library/cc656912.aspx
you need to check the framework you are using and the framework yout library was compiled for...
I'm getting this error
The type or namespace name 'DataVisualization' does not exist in the namespace 'System.Windows.Forms' (are you missing an assembly reference?)
Here is my using section of the class:
using System;
using System.Collections;
using System.Collections.Generic;
using System.Windows.Forms.DataVisualization.Charting;
using System.Windows.Forms.DataVisualization.Charting.Borders3D;
using System.Windows.Forms.DataVisualization.Charting.ChartTypes;
using System.Windows.Forms.DataVisualization.Charting.Data;
using System.Windows.Forms.DataVisualization.Charting.Formulas;
using System.Windows.Forms.DataVisualization.Charting.Utilities;
namespace myNamespace {
public class myClass {
// Usual class stuff
}
}
The thing is that I am using the same DataVisualization includes in another class. The only thing that I can think that is different is that the classes that are giving this missing namespace error are Solution Items rather than specific to a project. The projects reference them by link. Anyone have thoughts on what the problem is? I've installed the chart component, .Net 3.5 SP1, and the Chart Add-in for Visual Studio 2008.
UPDATE: I moved the items from Solution Items to be regular members of my project and I'm still seeing the same behavior.
UPDATE 2: Removing the items from the Solution Items and placing them under my project worked. Another project was still referencing the files which is why I didn't think it worked previously. I'm still curious, though, why I couldn't use the namespace when the classes were Solution Items but moving them underneath a project (with no modifications, mind you) instantly made them recognizable. :\
You are very likely missing a reference to the DataVisualization DLL. Note that although they share the namespace of System.Windows.Forms.dll, they aren't actually contained within it.
Solution items aren't used by compiled assemblies.
http://msdn.microsoft.com/en-us/library/1ee8zw5t.aspx
"They can be referenced by projects, but are never included in solution or project builds"
As far as I know, solution folders/items are really just meant for organizing things.
Are you getting actual build errors or just squiggles? Try building and look at the output window, does it succeed or fail?
In VS 2008 SP1 C# introduced a top level error squiggling feature. It's possible that if you open the solution item version of the file it will squiggle because of a lack of default references. The solution should still build correctly though.
If this is not the case try adding the file directly to the project (no link). See if that eliminates the error. If so then we know it has to due with a linked file and it can help track down the problem.