ASP.Net/Language Basics/Property
Define and use properties (C#)
<%@ page Language="c#" runat="server" %>
<script runat="server">
public class Calculator
{
private double currentValue;
public double CurrentValue
{
get
{
return currentValue;
}
}
public void Add(double addValue)
{
currentValue += addValue;
}
public void Subtract(double subValue)
{
currentValue -= subValue;
}
public void Multiply(double multValue)
{
currentValue *= multValue;
}
public void Divide(double divValue)
{
currentValue /= divValue;
}
public void Clear()
{
currentValue = 0;
}
}
void Page_Load()
{
Calculator MyCalc = new Calculator();
Response.Write("<b>Created a new Calculator object.</b><br/>");
Response.Write("Current Value = " + MyCalc.CurrentValue);
MyCalc.Add(23);
Response.Write("<br/><b>Added 23 - MyCalc.Add(23)</b><br/>");
Response.Write("Current Value = " + MyCalc.CurrentValue);
MyCalc.Subtract(7);
Response.Write("<br/><b>Subtracted 7 - MyCalc.Subtract(7)</b><br/>");
Response.Write("Current Value = " + MyCalc.CurrentValue);
MyCalc.Multiply(3);
Response.Write("<br/><b>Multiplied by 3 - MyCalc.Multiply(3)</b><br/>");
Response.Write("Current Value = " + MyCalc.CurrentValue);
MyCalc.Divide(4);
Response.Write("<br/><b>Divided by 4 - MyCalc.Divide(4)</b><br/>");
Response.Write("Current Value = " + MyCalc.CurrentValue);
MyCalc.Clear();
Response.Write("<br/><b>Cleared - MyCalc.Clear()</b><br/>");
Response.Write("Current Value = " + MyCalc.CurrentValue);
}
</script>
Properties for read and write (C#)
<%@ page Language="c#" runat="server" %>
<script runat="server">
public class Car
{
private string color;
private int gear;
public string Color
{
get
{
return color;
}
set
{
color = value;
}
}
public int Gear
{
get
{
return gear;
}
}
public void ChangeGear(int Direction)
{
if (Direction < 0)
gear--;
if (Direction > 0)
gear++;
if ( gear > 5)
gear = 5;
if ( gear < -1)
gear = -1;
}
}
void Page_Load()
{
Car MyCar = new Car();
Response.Write("<b>New object "MyCar" created.</b>");
Response.Write("<br/>Color: " + MyCar.Color);
Response.Write("<br/>Gear: " + MyCar.Gear);
MyCar.Color = "Black";
MyCar.ChangeGear(+1);
Response.Write("<br/><b>Properties updated.</b>");
Response.Write("<br/>New color: " + MyCar.Color);
Response.Write("<br/>New gear: " + MyCar.Gear);
}
</script>
Throw Exception in Property setter (VB.net)
<%@ Page Language="VB" %>
<script runat="server">
Public Class Math
Private intValue As Integer
Public Property InValue() As Integer
Get
Return intValue
End Get
Set(ByVal value As Integer)
If intValue > 0 Then
intValue = value
Else
Throw New Exception("InValue can not be less than 1")
End If
End Set
End Property
Public Function MultiplyBySelf(ByVal InValue As Integer) As Integer
Return Multiply(InValue, InValue)
End Function
Private Function Multiply(ByVal FirstValue As Integer, ByVal SecondValue As Integer)
Return FirstValue * SecondValue
End Function
End Class
Sub Page_Load()
Dim clsMath As Math
clsMath = New Math
clsMath.InValue = 10
lblMessage.Text = clsMath.MultiplyBySelf(10)
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>Show Shared Hello World</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label
id="lblMessage"
Runat="server" />
</div>
</form>
</body>
</html>