Write line to MATLAB from C#

Question

I want to write a line in the MATLAB command window from a C# method. This is the .NET code:

using System;

namespace SharpLab {
    public class Test {
        public void Run() {
            dynamic Matlab = Activator.CreateInstance(Type.GetTypeFromProgID("Matlab.Application"));
            Matlab.Execute("clc"); // This line does work.
            Matlab.Execute("disp('Hello world!')"); // This line does not work.
        }
    }
}

Now I load the library, create a class instance and run the method. This is the MATLAB code:

disp('This message goes to the command window. Can .NET call clc?');
NET.addAssembly('SharpLab.dll');
Test = SharpLab.Test;
Test.Run();

This does run and the command window is cleared by clc. The second call, 'Hello world!', does not work.

How can I print messages from C# in the MATLAB command window?

EDIT: I received a message linking to http://www.mathworks.nl/support/solutions/en/data/1-C9Y0IJ/index.html?product=SL&solut=. This solution collects all the written information into a variable to use, however the real function I am running does work for about a minute with a lot of messages in between. Waiting a minute before throwing a wall of text is not what I am after.

Answer 1

How about using .NET events to inform listeners that an event occurred, where you register an event handler in MATLAB to do the actual printing.

Here is a toy example that finds all prime numbers up to 10000. First we create the C# library:

MyClass.cs

using System;

namespace MyLibrary
{
    public class MyClass
    {
        // function that does some work and notify listeners of occurred events
        public void FindPrimes()
        {
            // Primes between 1 and 10000
            for (int i = 1; i < 10000; i++)
            {
                if (MyClass.isPrime(i))
                {
                    //System.Console.WriteLine(i);
                    onPrimeFound(i);
                }
            }
        }

        // helper function to determine if number is prime
        public static bool isPrime(int x)
        {
            if (x == 1) return false;
            if (x == 2) return true;
            for (int i = 2; i <= Math.Ceiling(Math.Sqrt(x)); i++)
            {
                if (x % i == 0) return false;
            }
            return true;
        }

        // event broadcasted
        public event EventHandler PrimeFound;
        protected void onPrimeFound(int x)
        {
            var handler = this.PrimeFound;
            if (handler != null)
            {
                handler(this, new PrimeEventArgs(x));
            }
        }
    }

    // event data passed to listeners
    public class PrimeEventArgs : EventArgs
    {
        public readonly int number;
        public PrimeEventArgs(int x)
        {
            this.number = x;
        }
    }
}

MATLAB

Next we use our class library inside MATLAB:

>> NET.addAssembly('C:\path\to\MyLibrary.dll');
>> c = MyLibrary.MyClass();
>> lh = addlistener(c, 'PrimeFound', @(o,e) fprintf('Prime: %d\n', e.number));
>> c.FindPrimes()
Prime: 2
Prime: 3
Prime: 5
...
Prime: 9973

The C# function FindPrimes() performs a lengthy operation, while emitting events to let interested observers know of occurred events (basically whenever you want to print something to MATLAB console). It should print immediately without buffering.