Loading Custom Assemblies with CompileAssemblyFromSource

Question

I'm not quite sure where to go with this. The overall objective is to be able to take a user script, and execute it within a .NET environment. I have most of the code written and things work provided I don't attempt to load my own assemblies. However, to safely give users access to internal portions of the system, a proxy DLL has been created. This is where the problem seems to be. Right now this proxy DLL has one thing in it, an interface. ``` CompilerParameters options = new CompilerParameters(); options.GenerateExecutable = false; options.GenerateInMemory = true; options.ReferencedAssemblies.Add("System.dll"); options.ReferencedAssemblies.Add("ScriptProxy.dll"); Microsoft.CSharp.CSharpCodeProvider provider = new Microsoft.CSharp.CSharpCodeProvider(); CompilerResults result = provider.CompileAssemblyFromSource(options, script); // This line here throws the error: return result.CompiledAssembly; ``` Running the above code, it throws the following error: System.IO.FileNotFoundExceptio…

Accepted Answer

This is because the compilation step failed and you have not check it for errors...

```
    static Assembly Compile(string script)
    {
        CompilerParameters options = new CompilerParameters();
        options.GenerateExecutable = false;
        options.GenerateInMemory = true;
        options.ReferencedAssemblies.Add("System.dll");
        options.ReferencedAssemblies.Add("ScriptProxy.dll");

Microsoft.CSharp.CSharpCodeProvider provider = new Microsoft.CSharp.CSharpCodeProvider();
        CompilerResults result = provider.CompileAssemblyFromSource(options, script);

// Check the compiler results for errors
        StringWriter sw = new StringWriter();
        foreach (CompilerError ce in result.Errors)
        {
            if (ce.IsWarning) continue;
            sw.WriteLine("{0}({1},{2}: error {3}: {4}", ce.FileName, ce.Line, ce.Column, ce.ErrorNumber, ce.ErrorText);
        }
        // If there were errors, raise an exception...
        string errorText = sw.ToString();
        if (errorText.Length > 0)
            throw new ApplicationException(errorText);

return result.CompiledAssembly;
    }
```

Loading Custom Assemblies with CompileAssemblyFromSource

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