Question

I create a Class Library project and I build it.now i copy the Dll to “C:\”.Now i want to open this Dll with reflection:

using System.Reflection;

        byte[] assem = System.IO.File.ReadAllBytes(@"c:\Company.dll");
        var loadedAssem = Assembly.Load(assem);
        Type thePersonType = loadedAssem.GetType();
        var theObj = loadedAssem.CreateInstance("Company.Person");
        // or  var theObj = loadedAssem.CreateInstance("Company.Person")as IPlugin ;
        Type[] paramTypes = new Type[1];
        paramTypes[0] = Type.GetType("System.String");
        MethodInfo PersonInfo = thePersonType.GetMethod("FullName", paramTypes);
        Object[] parameters = new Object[1];
        parameters[0] = "Mr. ";
        Object returnVal = PersonInfo.Invoke(theObj, parameters);
        MessageBox.Show(returnVal.ToString());

I cant Invoke my “FullName” method.
this is my Interface:

public interface IPlugin
{
    String FullName(String PreName);
}

and this is my Person Class in my DLL:

public class Person:IPlugin
{
    public int PersonID { get; set; }
    public String PersonName { get; set; }
    public String PersonLName { get; set; }
    public String FullName(String PreName)
    {
        return PreName+this.PersonName + this.PersonLName;
    }
}

Answer 1

I solve the problem with this code.and we shold to use interface “IPlugin” in a seperate class library and use in other project.

        Assembly objAssembly = Assembly.LoadFrom("Company.dll");
        Type objAssemblyType = objAssembly.GetType();

        foreach (Type type in objAssembly.GetTypes())
        {
            if (type.IsClass == true)
            {
                var classInstance = objAssembly.CreateInstance(type.ToString()) as IPlugin;
                lblFullName.Text = classInstance.FullName("Mr. ");

            }
        }