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C# in-process compiler

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CSharpInProcessCompiler
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using System;
using System.CodeDom.Compiler;
using System.Collections.Generic;
using System.Diagnostics;
using System.Reflection;
using System.Text;
using Microsoft.CSharp;
 
namespace ActiveMesa.R2P.Infrastructure
{
internal class CSharpInProcessCompiler
{
internal Assembly Compile(string sourceCode, string compilerVersion = "v4.0")
{
CompilerParameters ps = PrepareCompilerParameters();
 
var po = new Dictionary<string, string>
{
{"CompilerVersion", compilerVersion}
};
var p = new CSharpCodeProvider(po);
var results = p.CompileAssemblyFromSource(ps, new[] {sourceCode});
 
if (results.Errors.HasErrors)
{
var sb = new StringBuilder();
foreach (var e in results.Errors)
sb.AppendLine(e.ToString());
throw new Exception(sb.ToString());
}
 
return results.CompiledAssembly;
}
 
internal Type CompileAndGetType(string sourceCode, string compilerVersion = "v4.0")
{
var ass = Compile(sourceCode, compilerVersion);
var types = ass.GetTypes();
if (types == null || types.Length == 0)
throw new Exception("Compiled assembly produced no types");
else
return types[0];
}
 
internal object CompileAndInstantiate(string sourceCode, string compilerVersion = "v4.0")
{
var mainType = CompileAndGetType(sourceCode, compilerVersion);
return Activator.CreateInstance(mainType);
}
 
private CompilerParameters PrepareCompilerParameters()
{
var ps = new CompilerParameters {GenerateInMemory = true, GenerateExecutable = false};
 
// add everything in this AppDomain
foreach (var reference in AppDomain.CurrentDomain.GetAssemblies())
{
try
{
ps.ReferencedAssemblies.Add(reference.Location);
}
catch (Exception ex)
{
string s = "Cannot add assembly " + reference.FullName + " as reference.";
Debug.WriteLine(s);
}
}
 
return ps;
}
}
}

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