Creating a Hello World

HelloWorld.cs

// https://social.msdn.microsoft.com/Forums/en-US/3a720901-fdc5-47dc-8057-e06454525c82/how-to-generate-c-code-at-run-time-using-c-language?forum=csharplanguage
// https://benohead.com/three-options-to-dynamically-execute-csharp-code/
// http://stackoverflow.com/questions/875723/how-to-debug-break-in-codedom-compiled-code

using System;
using System.CodeDom;
using System.CodeDom.Compiler;
using System.Globalization;
using System.IO;
using System.Reflection;

namespace RuntimeCodeGenerationTest
{
    internal class Program
    {
        private static void Main()
        {
            var codeUnit = new CodeCompileUnit();
            var codeNameSpace = new CodeNamespace("DynamicSourceCodeGeneration");
            var usingSystemDll = new CodeNamespaceImport("System");
            var programClass = new CodeTypeDeclaration("Program")
            {
                IsClass = true,
                TypeAttributes = TypeAttributes.Public | TypeAttributes.Sealed
            };

            codeNameSpace.Imports.Add(usingSystemDll);
            codeNameSpace.Types.Add(programClass);

            codeUnit.Namespaces.Add(codeNameSpace);

            var entryPointMethod = new CodeEntryPointMethod();
            var systemConsoleReference = new CodeTypeReferenceExpression("System.Console");
            var helloWorldStatement = new CodeMethodInvokeExpression(systemConsoleReference, "WriteLine",
                new CodePrimitiveExpression("Hello World!"));
            entryPointMethod.Statements.Add(helloWorldStatement);
            programClass.Members.Add(entryPointMethod);

            var codeDomProvider = CodeDomProvider.CreateProvider("CSharp");
            var generatorOptions = new CodeGeneratorOptions {BracingStyle = "C"};
            using (var sourceWriter = new StreamWriter("HelloWorld.cs"))
            {
                codeDomProvider.GenerateCodeFromCompileUnit(codeUnit, sourceWriter, generatorOptions);
            }

            Console.WriteLine(File.ReadAllText("HelloWorld.cs"));
            Console.WriteLine();
            Console.WriteLine("#################################");
            Console.WriteLine();

            var cp = new CompilerParameters();
            cp.ReferencedAssemblies.Add("System.dll");
            cp.GenerateExecutable = false;
            cp.GenerateInMemory = false; //default
            cp.TempFiles = new TempFileCollection(Environment.GetEnvironmentVariable("TEMP"), true);
            cp.IncludeDebugInformation = true;
            var compilerResult = codeDomProvider.CompileAssemblyFromDom(cp, codeUnit);

            var assembly = compilerResult.CompiledAssembly;
            var type = assembly.GetType("DynamicSourceCodeGeneration.Program");
            var method = type.GetMethod("Main");
            var obj = assembly.CreateInstance(type.FullName);
            method.Invoke(obj, BindingFlags.InvokeMethod, null, null, CultureInfo.CurrentCulture);

            Console.Write("\nPress any key to exit.");
            Console.ReadKey(true);
        }
    }
}