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using System;
using System;
using System.IO;
using System.IO;
using System.Linq;
using System.Linq;
using System.Reflection;
using System.Reflection;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp;


class Program
class Program
{
{
static void Main(string[] args)
static void Main(string[] args)
{
{
var greetings = HelloWorlder.GetGreetings();
var greetings = HelloWorlder.GetGreetings();
// should write Hello World
// should write Hello World
greetings();
greetings();
}
}
}
}


public static class HelloWorlder
public static class HelloWorlder
{
{
public static Action GetGreetings()
public static Action GetGreetings()
{
{
var tree = CSharpSyntaxTree.ParseText(@"
var tree = CSharpSyntaxTree.ParseText(@"
using System;
using System;
public class MyClass
public class MyClass
{
{
public static void Main()
public static void Main()
{
{
Console.WriteLine(""Hello World!"");
//Console.WriteLine(""Hello World!"");
Console.ReadLine();
//Console.ReadLine();
}
}
}");
}");
const string testAsmName = "testLib";
const string testAsmName = "testLib";


var coreDir = Path.GetDirectoryName(typeof(object).GetTypeInfo().Assembly.Location);
var coreDir = Path.GetDirectoryName(typeof(object).GetTypeInfo().Assembly.Location);


var mscorlib = MetadataReference.CreateFromFile(Path.Combine(coreDir, "mscorlib.dll"));
var mscorlib = MetadataReference.CreateFromFile(Path.Combine(coreDir, "System.Private.CoreLib.dll"));

var options = new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary);
var compilation = CSharpCompilation.Create(testAsmName,
var compilation = CSharpCompilation.Create(testAsmName,
syntaxTrees: new[] { tree }, references: new[] { mscorlib });
syntaxTrees: new[] { tree }, references: new[] { mscorlib }, options: options);


var emitResult = compilation.Emit($"{testAsmName}.dll");
var ms = new MemoryStream();

var emitResult = compilation.Emit(ms);
ms.Seek(0, SeekOrigin.Begin);


if (!emitResult.Success)
if (!emitResult.Success)
{
{
throw new Exception(string.Join(Environment.NewLine, emitResult.Diagnostics.Select((x, i) => $"{i + 1}. {x}")));
throw new Exception(string.Join(Environment.NewLine, emitResult.Diagnostics.Select((x, i) => $"{i + 1}. {x}")));
}
}
var ourAssembly = Assembly.Load(new AssemblyName(testAsmName));

var ourAssembly = Assembly.Load(ms.ToArray());
var type = ourAssembly.GetType("MyClass");
var type = ourAssembly.GetType("MyClass");


var meth = type.GetRuntimeMethod("Main", Type.EmptyTypes);
var meth = type.GetRuntimeMethod("Main", Type.EmptyTypes);

ms.Close();
return () => meth.Invoke(null, null);
return () => meth.Invoke(null, null);
}
}
}
}
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