How can I compile, run and decompile C# code in Ubuntu terminal?
Solution 1
You can use mono
which is C#
implementation, having cross-platform support and is open source.
Open terminal and install mono:
For Ubuntu 20.04 (Stable)
sudo apt install gnupg ca-certificates
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
echo "deb https://download.mono-project.com/repo/ubuntu stable-focal main" | sudo tee /etc/apt/sources.list.d/mono-official-stable.list
sudo apt update
For Ubuntu 18.04
sudo apt install apt-transport-https dirmngr
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
echo "deb https://download.mono-project.com/repo/ubuntu vs-bionic main" | sudo tee /etc/apt/sources.list.d/mono-official-vs.list
sudo apt update
For Ubuntu 16.04
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
sudo apt install apt-transport-https
echo "deb https://download.mono-project.com/repo/ubuntu vs-xenial main" | sudo tee /etc/apt/sources.list.d/mono-official-vs.list
sudo apt update
For Ubuntu 14.04
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
sudo apt install apt-transport-https
echo "deb https://download.mono-project.com/repo/ubuntu vs-trusty main" | sudo tee /etc/apt/sources.list.d/mono-official-vs.list
sudo apt update
Then type
sudo apt install mono-complete
Create a sample C#
file in the current directory
For example you can use the following code:
class GoodDay
{
public static void Main()
{
System.Console.WriteLine("Good Day!");
}
}
Use any text editor like gedit, type the following code and save the file as GoodDay.cs
The command to compile the code -
mcs -out:GoodDay.exe GoodDay.cs
An executable file GoodDay.exe
is generated.
The command to execute the .exe
file -
mono GoodDay.exe
The output will be -
Good Day!
The command to decompile the executable file -
monodis --output=GoodDay.txt GoodDay.exe
The decompiled code information is saved in the newly generated file GoodDay.txt
Solution 2
You need to install mono-complete if you want to run software for Mono or Microsoft .NET which you are not installing from a Debian package.
-
Install mono-complete. In all currently supported versions of Ubuntu open the terminal and type:
sudo apt install mono-complete
-
Save your C# code in a file called hello.cs. Example hello.cs code is:
using System; namespace Project_1 { class MainClass { public static void Main (string[] args) { Console.WriteLine ("Hello World!"); Console.ReadKey (); } } }
Make hello.cs executable. Right-click the hello.cs file -> select Properties -> Permissions tab -> put a check mark to the left of Allow executing file as program.
Change directories using the
cd
command to the directory that contains the hello.cs file.-
Use the mcs compiler and create a Windows executable named hello.exe from the source hello.cs.
mcs -out:hello.exe hello.cs
-
Run the hello.exe program with mono.
mono hello.exe
-
The results of running your program in step 6. should be:
Hello World!
Press Enter to exit back to a default terminal prompt.
-
Decompile the executable file.
monodis --output=decompiled-hello.txt hello.exe
Solution 3
The official .NET Core from Microsoft has been around since 2016. It's open source software and supports many platforms. Even Mono now shares some code with .NET Core so there's almost no reason to use Mono in 2018
Just go to the official website to download and install. If you want to install from command line then visit Install .NET on Linux, specifically Install the .NET SDK or the .NET Runtime on Ubuntu. To install the SDK and runtime with apt use
sudo apt-get update; \
sudo apt-get install -y apt-transport-https && \
sudo apt-get update && \
sudo apt-get install -y dotnet-sdk-5.0
You can also install with snap
sudo snap install dotnet-sdk --classic --channel=5.0
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Sonevol
Sexually I am transsexual lesbian. Please consider me to be female and address me by "she" and "her" and be compassionate to my feelings. Pets are my love and my pet Bhutu (female balck and white tuxedo cat) means everything to me. Also I love my mom, my grand-mom and the girl named Puja. I also love the two children which Puja has. We six are almost family. I like UNIX and UNIX based operating systems. I love to play around with Linux and learn newer things. Professionally I am front end web developer working independently. Also I am a weed addict.
Updated on September 18, 2022Comments
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Sonevol over 1 year
I have a C# code which I need to compile, execute and decompile using the terminal.
How can I do so?
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Vikas Lalwani over 3 yearsI think it would be easier to install VS code on Linux and then code in C#, as explained here, step by step: qawithexperts.com/article/c-sharp/…
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Sonevol over 5 yearsI don't think you have to perform Step 8
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Sonevol over 5 yearsBut I tested too and I did not need the Step 8, Oh ok I am sorry I did not put Console.ReadKey();
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karel over 5 yearsMy bad for not including the sample hello.cs code that I used in Step 2 which I have edited my answer and included
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phuclv over 2 yearswhy use Mono in 2018 when the official .NET Core has been available for Linux since 2016?
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karel over 2 yearsBecause I posted the top upvoted answer on this page, I've tried various iterations of .NET Core as an alternative to Mono, but I still haven't gotten it to work well in Ubuntu.