Compiling C # code

Using microsoft.csharp;using system.codedom.compiler;using system.reflection;using system.text;namespace System{                public static class Compilecscatruntime {public static void HelloWorld () {String code = @ "                Using System; Namespace first {public class program {Publi c static void Main () {"+" Console.WriteLine (\ "H                          Ello, world!\ ");            + @"                        }                    }                }            ";            CSharpCodeProvider Provider = new CSharpCodeProvider ();            CompilerParameters parameters = new CompilerParameters (); Reference to System.Drawing library parameters.            Referencedassemblies.add ("System.Drawing.dll"); True-memory generation, false-external file generation parameters.            GenerateInMemory = true; True-exe file generation, False-dll file generation parameters.            GenerateExecutable = true;            CompilerResults results = provider.compileassemblyfromsource (parameters, code); if (results.                errors.haserrors) {StringBuilder sb = new StringBuilder (); foreach (CompilerError Error in results. Errors) {sb. Appendline (String.Format ("error ({0}): {1}", error.) ErrorNumber, error.                ErrorText)); } throw new InvalidOperationException (sb.)            ToString ());            } Assembly Assembly = results.compiledassembly; Type program = assembly.            GetType ("First.program"); MethodInfo main = program.            GetMethod ("Main"); Main.        Invoke (null, NULL);            public static void Testmeothds () {MethodInfo function = Createfunction ("x + 2 * y"); var betterfunction = (func<doUble, double, double>) Delegate.createdelegate (typeof (Func<double, Double, double>), function);            Func<double, double, double> lambda = (x, y) + x + 2 * y;            DateTime start;            DateTime stop;            Double result;            int repetitions = 5000000;            start = DateTime.Now;            for (int i = 0; i < repetitions; i++) {result = Originalfunction (2, 3);            } stop = DateTime.Now; Console.WriteLine ("Original-time: {0} ms", (Stop-start).            TotalMilliseconds);            start = DateTime.Now; for (int i = 0; i < repetitions; i++) {result = (double) function.            Invoke (NULL, new object[] {2, 3});            } stop = DateTime.Now; Console.WriteLine ("Reflection-time: {0} ms", (Stop-start).            TotalMilliseconds);            start = DateTime.Now;       for (int i = 0; i < repetitions; i++) {         result = Betterfunction (2, 3);            } stop = DateTime.Now; Console.WriteLine ("Delegate-time: {0} ms", (Stop-start).            TotalMilliseconds);            start = DateTime.Now;            for (int i = 0; i < repetitions; i++) {result = Lambda (2, 3);            } stop = DateTime.Now; Console.WriteLine ("Lambda-time: {0} ms", (Stop-start).        TotalMilliseconds);        public static double Originalfunction (double x, double y) {return x + 2 * y; } public static MethodInfo Createfunction (String function) {String code = @ "Usin                            G System;                    Namespace Userfunctions {public class Binaryfunction                            {public static double Function (double x, double y) { return funC_xy;            }                    }                }            "; String finalcode = code.            Replace ("Func_xy", function);            CSharpCodeProvider Provider = new CSharpCodeProvider ();            CompilerResults results = Provider.compileassemblyfromsource (new CompilerParameters (), Finalcode);            Type binaryfunction = Results.CompiledAssembly.GetType ("userfunctions.binaryfunction");        Return Binaryfunction.getmethod ("Function"); }    }}

　　

Compiling C # code