C# Compile in memory and create instance of memory assembly types

Question

How can I Load an assembly to memory and instatiate one of its types by using their name?

I have this to compile:

    /// <summary>
    /// Compiles the input string and saves it in memory
    /// </summary>
    /// <param name="source"></param>
    /// <param name="referencedAssemblies"></param>
    /// <returns></returns>
    public static CompilerResults LoadScriptsToMemory(string source, List<string> referencedAssemblies)
    {
        CompilerParameters parameters = new CompilerParameters();

        parameters.GenerateInMemory = true;
        parameters.GenerateExecutable = false;
        parameters.IncludeDebugInformation = false;

        //Add the required assemblies
        foreach (string reference in referencedAssemblies)
            parameters.ReferencedAssemblies.Add(reference);

        foreach (Assembly asm in AppDomain.CurrentDomain.GetAssemblies())
        {
            if (asm.Location.Contains("Microsoft.Xna") || asm.Location.Contains("Gibbo.Library") 
                || asm.Location.Contains("System"))
            {
                parameters.ReferencedAssemblies.Add(asm.Location);
            }
        }

        return Compile(parameters, source);
    }

    /// <summary>
    /// Compiles a source file with the given parameters and source
    /// </summary>
    /// <param name="parms"></param>
    /// <param name="source"></param>
    /// <returns></returns>
    private static CompilerResults Compile(CompilerParameters parameters, string source)
    {
        CodeDomProvider compiler = CSharpCodeProvider.CreateProvider("CSharp");
        return compiler.CompileAssemblyFromSource(parameters, source);
    }

Then, I try to use this to instantiate on of the members generated in memory by the code above:

    var handler = Activator.CreateInstance(SceneManager.ScriptsAssembly.FullName, name);
    ObjectComponent oc = (ObjectComponent)handler.Unwrap();

SceneManager.ScriptsAssembly.FullName :> I save the compiled assembly in SceneManager.ScriptsAssembly.

name :> name of the type I want to load

I got this error:

Error loading scene: Could not load file or assembly 'nhvneezw, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.

The assembly name is correct. What may it be?

Thanks in advance.

The left the important code out. Don't forget to check CompilerResults.Errors. If you save the assembly then don't compile to memory. Use Fuslogvw.exe for tough cases. — Hans Passant
– Hans Passant, Commented Mar 17, 2013 at 12:24

Novakov · Accepted Answer · 2013-03-17 12:01:40Z

4

According to MSDN (http://msdn.microsoft.com/en-US/library/system.codedom.compiler.compilerresults.compiledassembly.aspx)

The get accessor for the CompiledAssembly property calls the Load method to load the compiled assembly into the current application domain

You can use Assembly.CreateInstance(http://msdn.microsoft.com/en-US/library/dex1ss7c.aspx) method instead of Activator. If you need to create instance only by type name, you have to get value of CompilerResults.CompiledAssembly property.

answered Mar 17, 2013 at 12:01

Novakov

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1 Comment

João Alves Over a year ago

Thanks! I was able to load them correctly with the Assembly.CreateInstance() ;)

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