AppDomain : Listing Assemblies within the Current AppDomain and Creating an new AppDomain (Code Snippet)

using System.Reflection;

private void Form1_Load(object sender, EventArgs e)
{
AppDomain dom = AppDomain.CurrentDomain;

Assembly[] loadedAssembly = dom.GetAssemblies();
foreach (Assembly a in loadedAssembly)
listBox1.Items.Add(a.GetName().Name );
}

private void btnCreateAppDomain_Click(object sender, EventArgs e)
{
AppDomain aDo = AppDomain.CreateDomain("Shalvin");

Assembly[] loadedAssembly = aDo.GetAssemblies();
foreach (Assembly a in loadedAssembly)
listBox2.Items.Add(a.GetName().Name);
}










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Reflection in .Net
.Net Intermediate Language

.Net Remoting Walkthrough

Remoting is the process of two pieces of software communicating across application domains.
Start a Class Library call it say ShalvinObject. Create a class that inherits from MarshalByRefObject.

namespace ShalvinObject
{
class RemoteObject : MarshalByRefObject
{
public int Mul(int i, int j)
{
return i * j;
}
}

Now we are going to host the service. This can be done with Console, Windows Forms or Web Service.
Letsuse Windows Forms.
Add to a reference to the previously created dll, ie. ShalvinObject.dll and System.Runtime.Remoting.


using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Tcp;

private void Form1_Load(object sender, EventArgs e)
{
TcpChannel c = new TcpChannel(900);
ChannelServices.RegisterChannel(c);
RemotingConfiguration.RegisterWellKnownServiceType(typeof(ShalvinObject.RemoteObject), "Shalvin", WellKnownObjectMode.Singleton);
}

Now for testing the service lets create another Windows Application. Here too set references to ShalvinObject.dll and System.Runtime.Remoting.


using ShalvinObject;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Tcp;


private void Form1_Load(object sender, EventArgs e)
{
TcpChannel c = new TcpChannel();
ChannelServices.RegisterChannel(c);
object obj = Activator.GetObject(typeof(ShalvinObject.RemoteObject), "tcp://localhost:900/Shalvin");
RemoteObject ro = (RemoteObject)obj;
int intRes = ro.Mul(56, 45);
MessageBox.Show(intRes.ToString());
}

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Creating and Consuming Class Library in C#, Object Initializer

Hashtable and DictionaryEntry

HashTable Class of System.Collections namespace represents a collection of key/value pairs that are organized based on the hash code of the key.

using System.Collections;

Hashtable ht = new Hashtable();
private void Form1_Load(object sender, EventArgs e)
{
	ht.Add("Am", "Ambily");
	ht.Add("Di", "Divya");
	foreach (DictionaryEntry de in ht)
	{
		listBox1.Items.Add(de.Key);
		listBox2.Items.Add(de.Value);
	}
}

private void button1_Click(object sender, EventArgs e)
{
	ht.Add(textBox1.Text, textBox2.Text);
	ShowHashTable();
}

private void ShowHashTable()
{
	listBox1.Items.Clear();
	listBox2.Items.Clear();
	foreach (DictionaryEntry de in ht)
	{
		listBox1.Items.Add(de.Key);
		listBox2.Items.Add(de.Value);
	}
}

VB .Net

Dim ht As New Hashtable
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
	ht.Add("Am", "Ambily")
	ht.Add("Di", "Divya")
	ShowHT()
End Sub
Private Sub ShowHT()
	ListBox1.Items.Clear()
	ListBox2.Items.Clear()
	For Each de As DictionaryEntry In ht
		ListBox1.Items.Add(de.Key)
		ListBox2.Items.Add(de.Value)
	Next
End Sub
Private Sub btnAdd_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnAdd.Click
	ht.Add(txtKey.Text, txtValue.Text)
	ShowHT()
End Sub

Related Blog ReadOnlyCollectionBase Class Generics and Collection Initializer in .Net

ReadOnlyCollectionBase Class

Provides the abstract base class for a strongly typed non-generic read-only collection.This class makes the underlying collection available through the InnerList property.
Since ReadOnlyCollectionBase implements IEnumerable Interface you can iterate through the collection.

//class
using System.Collections;
class ShalvinBlogs : ReadOnlyCollectionBase
{
public void Add(String value)
{
InnerList.Add(value);
}
public string this[int index]
{
get
{
return (string)InnerList[index];
}
}
}

//Forms
ShalvinBlogs sb = new ShalvinBlogs();

private void Form1_Load(object sender, EventArgs e)
{
sb.Add("Shalvinpd.blogspot.com");
sb.Add("DotNetShalvin.blogspot.com");
foreach (string str in sb)
listBox1.Items.Add(str);
}
private void button1_Click(object sender, EventArgs e)
{
textBox1.Text = sb[0];
}

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Generics and Collection Initializer in .Net
Hashtable and DictionaryEntry