Create Assembly in-memory and run it...

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This has to do with CodeDom and Microsoft.CSharp namespace. The following code will let you compile and run code in memory, IMHO - perfect for scripting engine needs:

using System;
using Specialized = System.Collections.Specialized;
using Reflection = System.Reflection;
using CSharp = Microsoft.CSharp;
using CodeDom = System.CodeDom.Compiler;

public sealed class TestCompile
{

static string ScriptCodeToCompileInMem = "public class Script {public void ScriptExecute(){System.Console.WriteLine(123);} }";
public static void Main()
{
TestCompile tc = new TestCompile();
tc.Execute(TestCompile.ScriptCodeToCompileInMem);
}

public void Execute(string scriptCode)
{
string [] source = new string[1];
source[0] = scriptCode;
CSharp.CSharpCodeProvider cscp = new CSharp.CSharpCodeProvider();
this.Compile(cscp, source[0]);
}

private void Compile(CodeDom.CodeDomProvider provider, string source)
{
CodeDom.CompilerParameters param = new CodeDom.CompilerParameters();
param.GenerateExecutable = false;
param.IncludeDebugInformation = false;
param.GenerateInMemory = true;
CodeDom.ICodeCompiler cc = provider.CreateCompiler();
CodeDom.CompilerResults cr = cc.CompileAssemblyFromSource(param, source);
Specialized.StringCollection output = cr.Output;
if(cr.Errors.Count !=0)
{
System.Console.WriteLine("Error invoking scripts.");
CodeDom.CompilerErrorCollection es = cr.Errors;
foreach(CodeDom.CompilerError s in es)
System.Console.WriteLine(s.ErrorText);
}
else
{
object o = cr.CompiledAssembly.CreateInstance("Script");
System.Type type = o.GetType();
type.InvokeMember ("ScriptExecute",
             Reflection.BindingFlags.InvokeMethod |
Reflection.BindingFlags.Default, null, o, null);
}
}
}

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