Question

I’m making a windows application where user selects a type from combo box. Based on the selection, using reflection I want to create instance of the respective type and invoke one of its method.
The Types I want to create are also defined in the same windows app as sperate classes. But i’m getting the error as mentioned in Title. Heres my code.

Form1 code:

public partial class Form1 : Form
{

    public Form1()
    {
        InitializeComponent();
        cbLogs.SelectedIndex = 0;
    }

    private void btnProcess_Click(object sender, EventArgs e)
    {
        lblMessage.Text = "";
        lblResult.Text = "";
        if (cbLogs.SelectedIndex <= 0)
        {
            lblMessage.Text = "Please select Log to be processed";
            cbLogs.Focus();
            return;
        }
        Assembly currAss = System.Reflection.Assembly.GetExecutingAssembly();
        //I get above error on below line.
        object obj = Activator.CreateInstance(currAss.FullName,"SustainabilityXpress ");
        Type type = obj.GetType();
        object result = type.InvokeMember("process", 
            BindingFlags.Default | BindingFlags.InvokeMethod,
            null, obj, null);

        lblResult.Text = result.ToString();

    }

}

ILogBase Interface:

interface ILogBase
{        
    string process();

}

SustainabilityXpress class that implements ILogBase:

public class SustainabilityXpress: ILogBase
{
    string LogName = "SUSTAINABILITYXPRESS";
    public string process()
    {
        return "Sustainabilityxpress";
    }
}

Answer 1

Be sure to properly name the SustainabilityXpress class — aren’t you forgeting to prepend its namespace? (for instance, “Name.Space.SustainabilityXpress”).

Also, check Activator.CreateInstance to ensure all requirements are met.

And, as @Grzenio pointed out, there may be a typo in the name SustainabilityXpress.