Invoke code from string. parameter not accepted

Question

I wish to invoke code that is in selected txt file. It works fine until file content is something simple like "Text string". It also works if i pass string parameter into it. But when i try passing an object like in my case Global it fails. Error is: "The type or namespace name 'Global' could not be found (are you missing a using directive or an assembly reference?)" Here is some code..

private void button1_Click(object sender, EventArgs e)
    {
        Scripting scriptObj = new Scripting();
        scriptObj.fileName = this.openFileDialog1.FileName;
        scriptObj.tekst = File.ReadAllText(this.openFileDialog1.FileName);
        string exit = scriptObj.GetAction();
        this.label1.Text = exit;
    }


namespace WindowsFormsApplication2
{
public class Global
{
    public string fileName = "test string";
}

public class Scripting
{

    public string tekst = "";
    public string fileName = "";

    public string MyMethod1(Global obj) { return (obj.fileName); }

    public string GetAction()
    {
        string sourceCode = @" namespace WindowsFormsApplication2 { public class Scripting { public string MyMethod (Global obj) { return (" + tekst + "); }}}";
        var compParms = new CompilerParameters
        {
            GenerateExecutable = false,
            GenerateInMemory = true
        };

        var csProvider = new CSharpCodeProvider();
        CompilerResults compilerResults = csProvider.CompileAssemblyFromSource(compParms, sourceCode);
        if (compilerResults.Errors.HasErrors)
        {
            StringBuilder errors = new StringBuilder("Compiler Errors :\r\n");
            foreach (CompilerError error in compilerResults.Errors)
            {
                errors.AppendFormat("Line {0},{1}\t: {2}\n",
                       error.Line, error.Column, error.ErrorText);
            }
            return errors.ToString();
        }
        else
        {
            Global newGlobal = new Global();
            newGlobal.fileName = "TEsTfileNameToOutput";
            object typeInstance = compilerResults.CompiledAssembly.CreateInstance("WindowsFormsApplication2.Scripting");
            MethodInfo mi = typeInstance.GetType().GetMethod("MyMethod");
            string methodOutput = (string)mi.Invoke(typeInstance, new object[]{ newGlobal });
            return methodOutput;
        }
    }

}
}

Why does

public string MyMethod (Global obj) { return (" + tekst + "); }

not take Global as param, but it works ok with MyMethod1

public string MyMethod1(Global obj) { return (obj.fileName); }

Content of selected file is: obj.fileName

Jon Skeet · Accepted Answer · 2013-12-20 08:15:03Z

3

You haven't included a reference to the current assembly, which is the assembly declaring Global. Therefore the compiler has no idea which type you're talking about.

You need to set the ReferencedAssemblies property in the CompilerParameters that you're creating.

answered Dec 20, 2013 at 8:15

Jon Skeet

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3 Comments

NinjaOnTilt Over a year ago

what should i add? i tried: compParms.ReferencedAssemblies.Add("Global"); and its: "Metadata file 'Global' could not be found"

Jon Skeet Over a year ago

@NinjaOnTilt: Well what's your assembly called? The one containing all this code, that is. I doubt that it's called Global.exe or Global.dll. Perhaps WindowsFormsApplication2, given the namespace name? (I'd hope you'd come up with a better name, mind you...)

NinjaOnTilt Over a year ago

lol. sorry but i have no idea yet what my assembly is called. i put all program code up there. It's just public class Global { public string fileName = "test string"; } to me. Is : "WindowsFormsApplication2.exe" it?

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