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How to Compile a C# Project for Use on Linux?

I downloaded a C# project from github and compiled it with Visual Studio using the dotnet build command and apparently everything went well. But I can't use it on Centos, not even using Mono . Which command should I use to compile a C# project in VisualStudio for use on Linux? I used dotnet build which generated me a project with .exe file and I tried to run it with Mono and I got this error File does not contain a valid CIL image.
sorry if this is the wrong area to ask

There are different ways to do it and they depend on what you're trying to achieve.
From .NET application publishing overview
Type
Command
framework-dependent executable for the current platform.
dotnet publish
framework-dependent executable for a specific platform.
dotnet publish -r --self-contained false
framework-dependent cross-platform binary.
dotnet publish
self-contained executable.
dotnet publish -r
From the Examples section:
Publish an app cross-platform framework-dependent. A Linux 64-bit executable is created along with the dll file. This command doesn't work with .NET Core SDK 2.1.
dotnet publish -r linux-x64 --self-contained false
You may be interested in Single-file deployment and executable:
Bundling all application-dependent files into a single binary provides an application developer with the attractive option to deploy and distribute the application as a single file. Single-file deployment is available for both the framework-dependent deployment model and self-contained applications.

How to deploy .net framework console app to one exe file without run time

I want to deploy the .net framework console app and I want it to be in one .exe file but not include run time.
I have tried a similar thing with the .net 5 projects using this command:
dotnet publish -r win-x64 /p:PublishSingleFile=true /p:IncludeNativeLibrariesForSelfExtract=true --output "the path"
I have looked around the Web but could not find any working source
I am using .net framework 4.6

Is it possible to publish a stand alone c# application to Linux?

I am trying to publish a C# .net core console app I made, to a Linux machine running Centos 7 64 bit. Currently, I am publishing the app using the command:dotnet publish -c release -r contos.7-x64. Unfortunately, it appears as though publishing in this way requires .net core to be installed on the target machine. Is it possible to do this where I do not need to install anything on the machine that I am publishing to?

In .NET Core 2.2 you can create a self-contained app (i.e. not requiring .NET Core runtime installed on host machine) with this command dotnet publish -r centos.7-x64 -c Release --self-contained. It'll produce executable and a lot of dependencies.
In .NET Core 3 you can compress all dependencies into a single file dotnet publish -r centos.7-x64 -c Release /p:PublishSingleFile=true. You can also add flag /p:PublishTrimmed=true to reduce executable size by tree trimming.
More details can be found here and here.

I found that the issue was that the project was not compiling to core 2. Rather, the project was compiling to version 1. After making this change, the published project was able to run on Centos.

How to run .NET core application by double clicking a file like exe in .NET framework

In .NET framework when we build our solution/project, we get an exe in the debug/release folder and we can run our application by double clicking that exe. But how can we do this in .NET core, i know we can't have an exe in .NET core because it is windows specific. When i build my .NET core application i get the following files in the debug folder.
I know how to run this application using command prompt but i want to have a file like exe by clicking which i can run my application.

You can generate exe (self-contained application).
.NET Core 2.0 +
Open Package Manager Console or any other console in your project directory and type:
dotnet publish -c Release -r win10-x64
dotnet publish -c Release -r ubuntu.16.10-x64
When you use previous version of .NET Core you have to add runtime identifier of the target environment in csproj:
<PropertyGroup>
<RuntimeIdentifiers>win10-x64;ubuntu.16.10-x64</RuntimeIdentifiers>
</PropertyGroup>
Runtime Identifiers (RIDs) list:
https://learn.microsoft.com/en-us/dotnet/core/rid-catalog

One simple solution is to create a .bat file with runs the dll via the dotnet cli, then you get "a file like exe"
dotnet ConsoleApp2.dll

.Net core application cannot run on Linux?

I created a .Net core C# console application in Visual Studio and used the following steps to test it on Linux.
Use Visual Studio "Build -> Publish" menu item to create the executable files in ....\bin\Release\netcoreapp2.1\publish.
Copy the "publish" directory to the Linux machine
On Linux, chmod 777 myApp.dll
./myApp.dll
However, executing the app shows the error of
-bash: ./myApp.dll: cannot execute binary file

It looks like you did a Framework-Dependendent Deployment. Essentially, the publish command was:
dotnet publish -c Release
FDD assumes that you are going to have a .NET Core runtime to run your application on the target platform.
Once you copied over the publish directory to another machine (which could be Linux, macOS or Windows), your application still needs a .NET Core runtime to run your application.
Installing the .NET Core runtime depends on the particular Linux distribution that you are using. Once you have it installed, you can run your application by doing:
dotnet /path/to/publish/myApp.dll
An alternative to Framework Dependent Deployment is Self-Contained Deployment. In this mode, the published application will contain your application as well as a copy of the .NET Core runtime. On command line, doing a a SCD publish looks like this:
dotnet publish -r linux-x64 -c Release
For doing this in Visual Studio, see the link above. Then, you should see a bin\Release\netcoreapp2.1\linux-x64\publish\ directory that contains a myApp file. You can copy over this publish dir over to a Linux distribution and just run:
/path/to/linux-x64/publish/myApp