Newer
Older
C# is available on the cluster.
```console
$ ml av mono
-------------------- /apps/modules/lang ---------------
Mono/5.0.0.100
```
!!! note
Use the command `ml av mono` to get up-to-date versions of the modules.
Activate C# by loading the Mono module:
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```console
$ ml Mono
```
## Examples
### Hello World
Copy this code to new file hello.cs:
```csc
using System;
class HelloWorld {
static void Main() {
Console.WriteLine("Hello world!!!");
}
}
```
Compile the program and make *Windows executable*.
```console
$ mcs -out:hello.exe hello.cs
```
Now run the program:
```console
$ mono hello.exe
Hello world!!!
```
### Interactive Console
Type:
```console
$ csharp
Mono C# Shell, type "help;" for help
Enter statements below.
csharp>
```
Now you are in interactive mode. You can try following example.
```csc
csharp> using System;
csharp> int a = 5;
csharp> double b = 1.5;
csharp> Console.WriteLine("{0}*{1} is equal to {2}", a,b,a*b);
5*1.5 is equal to 7.5
csharp> a == b
false
```
Show all files modified in last 5 days:
```csc
csharp> using System.IO;
csharp> from f in Directory.GetFiles ("mydirectory")
> let fi = new FileInfo (f)
> where fi.LastWriteTime > DateTime.Now-TimeSpan.FromDays(5) select f;
{ "mydirectory/mynewfile.cs", "mydirectory/script.sh" }
```
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## MPI.NET
MPI is available for mono.
```csc
using System;
using MPI;
class MPIHello
{
static void Main(string[] args)
{
using (new MPI.Environment(ref args))
{
Console.WriteLine("Greetings from node {0} of {1} running on {2}",
Communicator.world.Rank, Communicator.world.Size,
MPI.Environment.ProcessorName);
}
}
}
```
Compile and run the program on Anselm:
```console
$ qsub -I -A DD-13-5 -q qexp -l select=2:ncpus=16,walltime=00:30:00
$ ml mpi.net
$ mcs -out:csc.exe -reference:/apps/tools/mpi.net/1.0.0-mono-3.12.1/lib/MPI.dll csc.cs
$ mpirun -n 4 mono csc.exe
Greetings from node 2 of 4 running on cn204
Greetings from node 0 of 4 running on cn204
Greetings from node 3 of 4 running on cn199
Greetings from node 1 of 4 running on cn199
```
For more informations look at [Mono documentation page](http://www.mono-project.com/docs/).