Can .NET Compile and Run Code Dynamically at Runtime?

Can we Generate New Code and Run It on-the-Fly in .NET?

You want to empower users to input equations into a text box and have them applied to incoming data points. While parsing the equation's text for every calculation was your initial approach, you seek a more efficient solution: compiling the equation into a function at runtime.

In .NET, this is indeed possible using techniques found in the Microsoft.CSharp, System.CodeDom.Compiler, and System.Reflection namespaces. A simple console application can illustrate this concept:

using Microsoft.CSharp;
using System;
using System.CodeDom.Compiler;
using System.Reflection;

namespace RuntimeCompilationTest {
    class Program
    {
        static void Main(string[] args) {
            // Define the source code for the SomeClass class
            string sourceCode = @"
                public class SomeClass {
                    public int Add42 (int parameter) {
                        return parameter += 42;
                    }
                }";

            // Set up compilation parameters
            var compParms = new CompilerParameters{
                GenerateExecutable = false, 
                GenerateInMemory = true
            };

            // Create a C# code provider
            var csProvider = new CSharpCodeProvider();

            // Compile the source code
            CompilerResults compilerResults = 
                csProvider.CompileAssemblyFromSource(compParms, sourceCode);

            // Create an instance of the SomeClass type
            object typeInstance = 
                compilerResults.CompiledAssembly.CreateInstance("SomeClass");

            // Get the Add42 method
            MethodInfo mi = typeInstance.GetType().GetMethod("Add42");

            // Invoke the Add42 method and display the output
            int methodOutput = 
                (int)mi.Invoke(typeInstance, new object[] { 1 }); 
            Console.WriteLine(methodOutput);
            Console.ReadLine();
        }
    }
}

In this code:

• The source code is defined for the SomeClass class containing the Add42 method.
• Configuration for code compilation is set up through compParms.
• csProvider compiles the source code.
• An instance of SomeClass is created.
• The Add42 method is invoked and its output is displayed.

This demonstration showcases the ability to compile and execute new code dynamically in .NET.

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