How to add folder to assembly search path at runtime in .NET?

Question

My DLLs are loaded by a third-party application, which we can not customize. My assemblies have to be located in their own folder. I can not put them into GAC (my applicatio

Answer 1

I've used @Mattias S' solution. If you actually want to resolve dependencies from the same folder - you should try using Requesting assembly location, as shown below. args.RequestingAssembly should be checked for nullity.

System.AppDomain.CurrentDomain.AssemblyResolve += (s, args) =>
{
    var loadedAssembly = System.AppDomain.CurrentDomain.GetAssemblies().Where(a => a.FullName == args.Name).FirstOrDefault();
    if(loadedAssembly != null)
    {
        return loadedAssembly;
    }

    if (args.RequestingAssembly == null) return null;

    string folderPath = Path.GetDirectoryName(args.RequestingAssembly.Location);
    string rawAssemblyPath = Path.Combine(folderPath, new System.Reflection.AssemblyName(args.Name).Name);

    string assemblyPath = rawAssemblyPath + ".dll";

    if (!File.Exists(assemblyPath))
    {
        assemblyPath = rawAssemblyPath + ".exe";
        if (!File.Exists(assemblyPath)) return null;
    } 

    var assembly = System.Reflection.Assembly.LoadFrom(assemblyPath);
    return assembly;
 };