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InvalidProgramException / Common Language Runtime detected an invalid program

I finally managed to solve this issue.
I unchecked code optimization in C# Express and that solved the issues. Still the weirdest thing, but since we are using old tools and framework we can not really blame anyone.

Why does this tiny program give Common Language Runtime detected an invalid program?

Based on Sohaiub Jundi's answer, I used SharpLab to dig some more (that site is awesome!), turns out the latest Roslyn build flags this as a compiler error:

error CS8982: A constructor declared in a 'record struct' with parameter list must have a 'this' initializer that calls the primary constructor or an explicitly declared constructor.

So apparently it is a bug in the currently latest .NET 6 version, and will be fixed in an upcoming release.

A workaround for now is to explicitly call the full constructor with all arguments:

using System.Numerics;

var transform = new Transform2(default);

public readonly record struct Transform2(Vector2 Position, float Rotation)
{
    public Transform2(Vector2 position) : this(position, default)
    {
        Position = position;
    }
}

Emit IL Like C# Method IL But Get System.InvalidProgramException : Common Language Runtime detected an invalid program

Since you are storing a value in a local variable with stloc.0, you need to declare it:

var il = dm.GetILGenerator();
il.DeclareLocal(typeof(int));

Your second version uses no locals so it does not have this issue.

The first version is what the compiler emits in debug mode, but in release mode it is more like your second example (except for the nop which is unnecessary).

Common Language Runtime detected an invalid program in DateTime getter

You're storing something in slot 0 (with Stloc_0), but you never declared slot 0.

You need to declare a local first, so ILGenerator can actually create the slot to store your variable in.

LocalBuilder local = ilGen.DeclareLocal(typeof(DateTimeOffset));

And then:

ilGen.Emit(OpCodes.Stloc, local);

---

You're using Ldloca_S to load the address of a local slot, but you never pass the slot to actually load.

ilGen.Emit(OpCodes.Ldloca, local);

(ILGenerator will turn this into Ldloca_S if appropriate).

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From the docs for ILGenerator.EmitCall:

Puts a call or callvirt instruction onto the Microsoft intermediate language (MSIL) stream to call a varargs method.

You're not calling a varargs method. Varargs methods are few and far between. You're calling a normal method, so just:

ilGen.Emit(OpCodes.Callvirt, field.GetMethod!);

and:

ilGen.Emit(OpCodes.Call, utcDateTimeMethod!);

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