How can I dynamically reference an assembly that looks for another assembly?

If it can't find a dependent assembly in the usual places, you'll need to manually specify how to find them.

The two easiest ways I'm aware of for doing this:

1. manually load the dependent assemblies in advance withAssembly.Load.

2. handle the AssemblyResolve event for the domain which is loading theassembly with additional assembly dependencies.

Both essentially require you to know the dependencies for the assembly you're trying to load in advance but I don't think that's such a big ask.

If you go with the first option, it would also be worthwhile looking into the difference between a full Load and a reflection-only Load.

If you would rather go with 2 (which I'd recommend), you can try something like this which has the added benefit of working with nested dependency chains (eg MyLib.dll references LocalStorage.dll references Raven.Client.dll references NewtonSoft.Json.dll) and will additionally give you information about what dependencies it can't find:

AppDomain.CurrentDomain.AssemblyResolve += (sender,args) => {    // Change this to wherever the additional dependencies are located        var dllPath = @"C:\Program Files\Vendor\Product\lib";    var assemblyPath = Path.Combine(dllPath,args.Name.Split(',').First() + ".dll");    if(!File.Exists(assemblyPath))       throw new ReflectionTypeLoadException(new[] {args.GetType()},           new[] {new FileNotFoundException(assemblyPath) });    return Assembly.LoadFrom(assemblyPath);};