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using System;

using System.IO;

using System.Linq;

using System.Reflection;

using Microsoft.CodeAnalysis;

using Microsoft.CodeAnalysis.CSharp;

class Program

{

static void Main(string[] args)

{

var greetings = HelloWorlder.GetGreetings();

// should write Hello World

greetings();

}

public static class HelloWorlder

{

public static Action GetGreetings()

{

var tree = CSharpSyntaxTree.ParseText(@"

using System;

public class MyClass

{

public static void Main()

{

Console.WriteLine(""Hello World!"");

//Console.WriteLine(""Hello World!"");

Console.ReadLine();

//Console.ReadLine();

}

}");

const string testAsmName = "testLib";

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,

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)

{

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

ms.Close();

return () => meth.Invoke(null, null);

}

Saved diffs

Original text

Open file

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

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

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

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

var mscorlib = MetadataReference.CreateFromFile(Path.Combine(coreDir, "mscorlib.dll"));
        var compilation = CSharpCompilation.Create(testAsmName,
            syntaxTrees: new[] { tree }, references: new[] { mscorlib });

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

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

var meth = type.GetRuntimeMethod("Main", Type.EmptyTypes);
        return () => meth.Invoke(null, null);
    }
}

Changed text

Open file

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

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

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

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

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

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

var ms = new MemoryStream();

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

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

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

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

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