CODEWITHSUNDEEP
dllassembly.reflectiononly
See Blunt
See Blunt

Reputation: 11

Creating instance with parameters and involking methods from dll

I am loading a dll, creating an instance and want to invoke methods and check return value. I am getting an exception {"Parameter count mismatch."} when creating an instance:

    static void Main(string[] args)
    {

            ModuleConfiguration moduleConfiguration = new ModuleConfiguration();

            // get the module information
            if (!moduleConfiguration.getModuleInfo())
                throw new Exception("Error: Module information cannot be retrieved");


            // Load the dll
            string moduledll =  Directory.GetCurrentDirectory() + "\\" +
                                                       moduleConfiguration.moduleDLL;
            testDLL = Assembly.LoadFile(moduledll);

            // create the object
            string fullTypeName = "MyNameSpace."+ moduleConfiguration.moduleClassName;
            Type moduleType = testDLL.GetType(fullTypeName);

            Type[] types = new Type[1];
            types[0] = typeof(string[]);

            ConstructorInfo constructorInfoObj = moduleType.GetConstructor(
                        BindingFlags.Instance | BindingFlags.Public, null,
                        CallingConventions.HasThis, types, null);

            if (constructorInfoObj != null)
            {
                Console.WriteLine(constructorInfoObj.ToString());
                constructorInfoObj.Invoke(args);
            }

The constructor for the class in dll is:
public class SampleModule:ModuleBase
{
    /// <summary>
    /// Initializes a new instance of the <see cref="SampleModule" /> class.
    /// </summary> 
    public SampleModule(string[] args)
        : base(args)
    {
        Console.WriteLine("Creating SampleModule"); 
    }

Qs: 1. What am I doing wrong? 2. How do I get method, invoke it and get return values? 3. Is there a better way to do this?

Upvotes: 0

Views: 97

Answers (1)

See Blunt
See Blunt

Reputation: 11

Just needed to add the following line:

Object[] param = new Object[1] { args };

before:

constructorInfoObj.Invoke(args);

Alternate (short) solution without using ConstructorInfo:

        :

       // create the object
        string fullTypeName = "MyNameSpace."+ moduleConfiguration.moduleClassName;
        Type moduleType = testDLL.GetType(fullTypeName);

        Object[] param = new Object[1] { args };
        Activator.CreateInstance(runnerType, param);

Upvotes: 1

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