Generics and Arrays Example in C#

C# > Generics > Generics and Arrays

Example: Use a single generic method that takes an IList<T> input parameter and iterate through both a list of integers and an array of string.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication2

{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)

        {
            string[] str = { "0", "1", "2", "3", "4" };
            List<int> intL = new List<int>();
            for (int x = 0; x < 5; x++)
            {
                intL.Add(x);
            }
            ProcessList<string>(str);
            ProcessList<int>(intL);
        }
        static void ProcessList<T>(IList coll)
        {
            foreach (T item in coll)
            {
                MessageBox.Show(item.ToString());
            }
        }
    }
}

Form VB.NET

VB.NET > Form

Form

Is a representation of any window displayed in an application.

Type

• standard
• tool
• borderless
• floating

Example

Create dialog box in runtime

Dim form1 As New Form()

Dim btnYes As New Button()

Dim btnNo As New Button()
btnYes.Text = "Yes"
btnYes.Location = New Point(5, 5)
btnNo.Text = "No"
btnNo.Location = New Point(btnYes.Left, btnYes.Top + 30)

form1.Controls.Add(btnYes)

form1.Controls.Add(btnNo)

form1.Text = "Confirm Dialog Box"

form1.FormBorderStyle = FormBorderStyle.FixedDialog
form1.MaximizeBox = False
form1.MinimizeBox = False
form1.AcceptButton = btnYes
form1.CancelButton = btnNo
form1.StartPosition = FormStartPosition.CenterScreen

form1.ShowDialog()

Object-Oriented Programming VB.NET

VB.NET > Object-Oriented Programming VB.NET

Visual Basic .NET has been entirely rewritten to be fully object-oriented and everything in Visual Basic .NET can be treated as an object.

OOP language:

• Abstraction
• Encapsulation
• Polymorphism
• Inheritance

Examplea

• Abstract class employee 
• Class with events

System Namespace VB.NET

VB.NET > System namespace

System namespace in VB.NET contains fundamental classes and base classes.

String

•  Concat

Create CDATA section XML C#

C# > XML > XmlDocument > CreateCDataSection

CreateCDataSection creates an XmlCDataSection.
CDATA is a section used to quote or escape blocks of text to keep that text from being interpreted as markup language.

Example:

XmlDocument doc = new XmlDocument();
doc.LoadXml("<product ID='1'></ product>");

//Create a CData section

XmlCDataSection CData;
CData = doc.CreateCDataSection("Size is 10/55");

//Add the new node to the document
XmlElement root = doc.DocumentElement;
root.AppendChild(CData);
doc.Save("C:\\Products.xml");

Result:

<product ID="1">

  <![CDATA[Size is 10/55]]>
</product>

Short type C# Example

C# > Types > short

The short keyword is an integral type.
Range: -32768 to 32767
Size: Signed 16-bit integer

Example:

short k = 32767; // ok
k = 32768; // Error Constant value '32768' cannot be converted to a 'short'

Struct in C# Example

C# > Types > Struct

A struct type is a value type and is typically used for representing lightweight objects (color, zip, point).

• cannot inherit from another struct or class
• can be instantiated without using a new operator.
• can implement an interface
• can contain fields, constructors, methods, operators and events, but
• if many members are required  you should make your type a class instead

Note:  Struct might be more efficient than a class in some scenarios. Using array of thousand of objects will be allocate more memory for referencing each object, so in this case, a struct would is more efficient and less expensive.






Example

        public struct strColor
        {
            public int r, g, b;
            public strColor(int p1, int p2, int p3)
            {
                r = p1;
                g = p2;
                b = p3;
            }
        }

       // Initialize using default and parameterized constructor

       strColor color1 = new strColor();
       strColor color2 = new strColor(10, 20, 30);

      // Declare object. It creates object without using the new  operator

       strColor color;

      //Initialize

       color.r = 10;
       color.g = 20;
       color.b = 30;