CODEWITHSUNDEEP
c#runtimedynamic-compilation
Yotam Salmon
Yotam Salmon

Reputation: 2411

(C#) Compiling class at runtime and calling methods from original code


I'm trying to compile code at runtime in C#, then from the compiled code call a function or initialize a class which is defined in the original code.
The code I currently have:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.CSharp;
using System.CodeDom.Compiler;
using System.Reflection;

namespace CTFGame
{
    class Program
    {
        static void Main(string[] args)
        {
            string code = @"

using System;

namespace CTFGame
{
    public class MyPlayer
    {
        public static void Main ()
        {
            Console.WriteLine(""Hello world"");
        }
        /*public void DoTurn ()
        {
            Program.SayHello();
        }*/
    }
}

";
            CSharpCodeProvider provider = new CSharpCodeProvider();
            CompilerParameters parameters = new CompilerParameters();
            parameters.GenerateInMemory = true;

            CompilerResults results = provider.CompileAssemblyFromSource(parameters, code);
            if (results.Errors.HasErrors)
            {
                string errors = "";
                foreach (CompilerError error in results.Errors)
                {
                    errors += string.Format("Error #{0}: {1}\n", error.ErrorNumber, error.ErrorText);
                }
                Console.Write(errors);
            }
            else
            {
                Assembly assembly = results.CompiledAssembly;
                Type program = assembly.GetType("CTFGame.MyPlayer");
                MethodInfo main = program.GetMethod("Main");
                main.Invoke(null, null);
            }
        }

        public static void SayHello()
        {
            Console.WriteLine("I'm awesome ><");
        }
    }
}

Now, Running the runtime loaded method 'Main' is a success, and the message "Hello world" is printed. The problem starts here: in the original code I have a method called "SayHello". I want to call this method from my runtime loaded code.
If I uncomment the "DoTurn" method, a compiler error will show in runtime:

Error #CS0103: The name 'Program' does not exist in the current context



My question is - is this possible, and how?

Putting the runtime loaded code in the same namespace doesn't help (and that makes sense), so what is the correct way to do that?

Thanks.

Upvotes: 8

Views: 5034

Answers (1)

Yotam Salmon
Yotam Salmon

Reputation: 2411

Adding a reference to the current assembly solved the problem:

CSharpCodeProvider provider = new CSharpCodeProvider();
CompilerParameters parameters = new CompilerParameters();
parameters.GenerateInMemory = true;                
//The next line is the addition to the original code
parameters.ReferencedAssemblies.Add(Assembly.GetEntryAssembly().Location);

More about: Compiling c# at runtime with user defined functions

Upvotes: 9

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