Properties
Properties are the some special statement of a class to expose the member of a class to the outside world . Properties accessors contain get and set keyword in declaration syntax . get accessors take the value from outside world and set accessors , set the value to class member.
Property value can be set,
by the keyword value. value is a keyword which can assign any type
of value like string, integer, Boolean, collection to the property . The value
keyword take the value from get property and assign it to the class
member variable. During the get and set , checking can be done and
additional required statement can be written to validate the value. Here
is the example of property with additional checking.
Read only and Write only Property : Sometimes we come with situation, once an object instance is created , the value cannot be changed.You can declare such property with some additional statement .
Read only Property : Read only property means, when object instance is created, the property will return the value of the member only. get set keyword is used in property, but in read only get is used, set portion not written here. Where is the example of read only property.
Write only Properties : A property can be define such a way that only assignment can be done that is Write only. In this case set portion of the property written and get portion of the property omitted. Here is the example of write only property.
Indexer : Indexer is a special kind of property that allow a group of object outside the world. this is the keyword used indexer. This keyword tails the compiler that the object will it self access the property. Increment get and set property and accessor[] operator. Indexer can be overloaded and induction always use this keyword and always refer to a group of element. Here is the example of indexer.
Indexer can be Overloaded : An indexer is not required to be integer and fixed. Indexer can have multiple parameter of different type, here is the example indexer overloading.
Collection Property : When a group of similar type object is used to assign private member of a class or retrieve the same, collection property is used. Namespace System.Collections need to be added in the top of a program, when we are using a collection property. Depending upon the type of collection program can be changed for get and set property. Here is the example of collection property.
Abstract properties : An abstract class have some properties and if it is derived , the abstract class properties will be inherited to the derived class. You will get all properties of abstract class in the derived class.
Properties are the some special statement of a class to expose the member of a class to the outside world . Properties accessors contain get and set keyword in declaration syntax . get accessors take the value from outside world and set accessors , set the value to class member.
public
class
Student
{
//private
veriable
private
int
mAge;
//property
declaration
public
int
Age
{
get
{
return
mAge;
}
set
{
mAge
= value;
}
}
}
//Class
for Demo
public
class
Demo
{
private
void
Show()
{
Student
obj = new
Student();
obj.Age
= 12;//Property
Assingmnent
}
}
Generally private member variable can not be
access from outside of the class. To assign value to the private member
variable and to retrieve the value from private member variable , get set
method is generally used. Another advantage of property is, during get
and set property declaration, customized validation can be done to allow only valid
values. Here is the example of a property.
public
class
Student
{
//private
veriable
private
int
mAge;
//property
declaration
public
int
Age
{
get
{
return
mAge;
}
set
{
if
(value
< 18)
{
Console.WriteLine("You
have now attained the age");
}
else
{
mAge
= value;
}
}
}
}
//Class
for Demo
public
class
Demo
{
private
void
Show()
{
Student
obj = new
Student();
obj.Age
= 12;//Property
Assingmnent
}
}
Read only and Write only Property : Sometimes we come with situation, once an object instance is created , the value cannot be changed.You can declare such property with some additional statement .
Read only Property : Read only property means, when object instance is created, the property will return the value of the member only. get set keyword is used in property, but in read only get is used, set portion not written here. Where is the example of read only property.
public
class
Student
{
//private
veriable
private
readonly
int
mAge;
//property
declaration
public
int
Age
{
get
{
return
mAge;
}
}
}
//Class
for frmo
public
class
Demo
{
private
void
Show()
{
Student
obj = new
Student();
int
lAge = obj.Age;//Get
Age from Student class
}
}
Write only Properties : A property can be define such a way that only assignment can be done that is Write only. In this case set portion of the property written and get portion of the property omitted. Here is the example of write only property.
public
class
Student
{
//private
veriable
private
int
mAge;
//property
declaration
public
int
Age
{
set
{
mAge
= value;
}
}
}
//Class
for Demo
public
class
Demo
{
private
void
Show()
{
Student
obj = new
Student();
obj.Age
= 12;//Property
Assingmnent
}
}
Indexer : Indexer is a special kind of property that allow a group of object outside the world. this is the keyword used indexer. This keyword tails the compiler that the object will it self access the property. Increment get and set property and accessor[] operator. Indexer can be overloaded and induction always use this keyword and always refer to a group of element. Here is the example of indexer.
public
class
Student
{
//private
veriable
private
int[]
mAge = new
int[10];
//property
declaration
public
int
this[int
i]
{
get
{
return
mAge[i];
}
set
{
mAge[i]
= value;
}
}
}
//Class
for Demo
public
class
Demo
{
private
void
Show()
{
Student
obj = new
Student();
obj[0]
= 12;
obj[1]
= 12;
obj[3]
= 13;
}
}
Indexer can be Overloaded : An indexer is not required to be integer and fixed. Indexer can have multiple parameter of different type, here is the example indexer overloading.
public
class
Student
{
//private
veriable
private
int[]
mAge = new
int[10];
//property
declaration
public
int
this[int
i]
{
get
{
return
mAge[i];
}
set
{
mAge[i]
= value;
}
}
public
string
this[string
Address]
{
get
{
return
Address;
}
set
{
//statement
}
}
}
//Class
for Demo
public
class
Demo
{
private
void
Show()
{
Student
obj = new
Student();
obj[0]
= 12;
obj[1]
= 12;
obj[3]
= 13;
}
}
Collection Property : When a group of similar type object is used to assign private member of a class or retrieve the same, collection property is used. Namespace System.Collections need to be added in the top of a program, when we are using a collection property. Depending upon the type of collection program can be changed for get and set property. Here is the example of collection property.
public
class
Student
{
//private
veriable
private
ArrayList
mAge = new
ArrayList();
//property
declaration
public
ArrayList
Age
{
set
{
Age
= value;
}
}
}
//Class
for Demo
public
class
Demo
{
private
void
Show()
{
Student
obj = new
Student();
ArrayList
arryList1 = new
ArrayList();
arryList1.Add(1);
arryList1.Add("Two");
arryList1.Add(3);
arryList1.Add(4.5);
obj.Age
= arryList1;
}
}
Abstract properties : An abstract class have some properties and if it is derived , the abstract class properties will be inherited to the derived class. You will get all properties of abstract class in the derived class.
abstract
class
Student
{
//private
veriable
private
ArrayList
mAge = new
ArrayList();
//property
declaration
public
ArrayList
Age
{
set
{
Age
= value;
}
}
}
//Inherited
class
class
Class
: Student
{
}
//Class
for Demo
public
class
Demo
{
private
void
Show()
{
Class
obj = new
Class();
ArrayList
arryList1 = new
ArrayList();
arryList1.Add(1);
arryList1.Add("Two");
arryList1.Add(3);
arryList1.Add(4.5);
obj.Age
= arryList1;
}
}
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