Activator Class (System)

Imports System.Reflection
Imports System.Text

Module Module1
    Sub Main()
        ' Create an instance of the StringBuilder type using 
        ' Activator.CreateInstance.
        Dim o As Object = Activator.CreateInstance(GetType(StringBuilder))

        ' Append a string into the StringBuilder object and display the 
        ' StringBuilder.
        Dim sb As StringBuilder = CType(o, StringBuilder)
        sb.Append("Hello, there.")
        Console.WriteLine(sb)

        ' Create an instance of the SomeType class that is defined in this assembly.
        Dim oh As System.Runtime.Remoting.ObjectHandle = _
            Activator.CreateInstanceFrom(Assembly.GetEntryAssembly().CodeBase, _
                                         GetType(SomeType).FullName)

        ' Call an instance method defined by the SomeType type using this object.
        Dim st As SomeType = CType(oh.Unwrap(), SomeType)

        st.DoSomething(5)
    End Sub

    Class SomeType
        Public Sub DoSomething(ByVal x As Int32)
            Console.WriteLine("100 / {0} = {1}", x, 100 \ x)
        End Sub
    End Class
End Module

' This code produces the following output:
' 
' Hello, there.
' 100 / 5 = 20

using System;
using System.Reflection;
using System.Text;

public class SomeType
{
    public void DoSomething(int x)
    {
        Console.WriteLine("100 / {0} = {1}", x, 100 / x);
    }
}

public class Example
{
    static void Main()
    {
        // Create an instance of the StringBuilder type using 
        // Activator.CreateInstance.
        Object o = Activator.CreateInstance(typeof(StringBuilder));

        // Append a string into the StringBuilder object and display the 
        // StringBuilder.
        StringBuilder sb = (StringBuilder) o;
        sb.Append("Hello, there.");
        Console.WriteLine(sb);

        // Create an instance of the SomeType class that is defined in this 
        // assembly.
        System.Runtime.Remoting.ObjectHandle oh = 
            Activator.CreateInstanceFrom(Assembly.GetEntryAssembly().CodeBase, 
                                         typeof(SomeType).FullName);

        // Call an instance method defined by the SomeType type using this object.
        SomeType st = (SomeType) oh.Unwrap();

        st.DoSomething(5);
    }
}

/* This code produces the following output:

Hello, there.
100 / 5 = 20
 */

using namespace System;
using namespace System::Reflection;
using namespace System::Text;

public ref class SomeType
{
public:
    void DoSomething(int x)
    {
        Console::WriteLine("100 / {0} = {1}", x, 100 / x);
    }
};

void main()
{
    // Create an instance of the StringBuilder type using 
    // Activator.CreateInstance.
    Object^ o = Activator::CreateInstance(StringBuilder::typeid);

    // Append a string into the StringBuilder object and display the 
    // StringBuilder.
    StringBuilder^ sb = (StringBuilder^) o;
    sb->Append("Hello, there.");
    Console::WriteLine(sb);

    // Create an instance of the SomeType class that is defined in this 
    // assembly.
    System::Runtime::Remoting::ObjectHandle^ oh = 
        Activator::CreateInstanceFrom(Assembly::GetEntryAssembly()->CodeBase, 
                                      SomeType::typeid->FullName);

    // Call an instance method defined by the SomeType type using this object.
    SomeType^ st = (SomeType^) oh->Unwrap();

    st->DoSomething(5);
};

/* This code produces the following output:

Hello, there.
100 / 5 = 20
 */