Thursday, June 4, 2020
Dependency Injection in C#
June 04, 2020
What is Dependency Injection ?
Dependency Injection is a software design pattern. It allows us to develop loosely-coupled code. The intent of Dependency Injection is to make code maintainable. Dependency Injection helps to reduce the tight coupling among software components. Dependency Injection reduces the hard-coded dependencies among your classes by injecting those dependencies at run time instead of design time technically.
Types of Dependency Injection in C#
1) Constructor Injection
2) Property Injection
3) Method Injection
1) Constructor Injection -
In the constructor injection, the injector supplies the service (dependency) through the client class constructor.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace SampleProgram
{
public interface text
{
void print();
}
class format : text
{
public void print()
{
Console.WriteLine("this is text format");
}
}
// constructor injection
public class constructorinjection
{
private text _text;
public constructorinjection(text t1)
{
this._text = t1;
}
public void print()
{
_text.print();
}
}
class constructor
{
static void Main(string[] args)
{
constructorinjection cs = new constructorinjection(new format());
cs.print();
Console.ReadKey();
}
}
}
Output:-
this is text format
2) Property Injection-
In the property injection (aka the Setter Injection), the injector supplies the dependency through a public property of the client class.
public interface INofificationAction
{
void ActOnNotification(string message);
}
class sam {
INofificationAction task = null;
public void notify(INofificationAction at ,string messages)
{
this.task = at;
task.ActOnNotification(messages);
}
}
class EventLogWriter : INofificationAction
{
public void ActOnNotification(string message)
{
// Write to event log here
}
}
class Program
{
static void Main(string[] args)
{
//services srv = new services();
//other oth = new other();
//oth.run();
//Console.WriteLine();
EventLogWriter elw = new EventLogWriter();
sam sm = new sam ();
sm.notify(elw, "to logg");
Console.ReadKey();
}
}
You cannot control when the dependency is set at all, it can be changed at any point in the object's lifetime.
3) Method Injection-
the client class implements an interface which declares the method(s) to supply the dependency and the injector uses this interface to supply the dependency to the client class.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace SampleProgram
{
public interface Iset
{
void print();
}
public class servic : Iset
{
public void print()
{
Console.WriteLine("Print");
}
}
public class client
{
private Iset _set;
public void run(Iset serv)
{
this._set = serv;
Console.WriteLine("Hi");
this._set.print();
}
}
class method
{
public static void Main()
{
client cn = new client();
cn.run(new servic());
Console.ReadKey();
}
}
}
Output:-
Hi
Print
Inheritance With Example
June 04, 2020
What is Inheritance ?
Acquiring (taking) the properties of one class into another class is called inheritance.
What Inheritance Provide ?
Inheritance provides reusability by allowing us to extend an existing class.
What is base & derived class ?
- Base class - is the class from which features are to be inherited into another class.
- Derived class - it is the class in which the base class features are inherited.
How to implement inheritance in C# ?
In below program Base class is Branch Class and Derived Class is Employee Class.
We want to inherit Base Class (Branch class) Function into Derived Class ( Employee Class) using inheritance.
public class Branch // Base Class
{
int BranchId;
string BranchName;
string BranchAddress;
public void GetBranchData()
{
Console.WriteLine("Enter Branch Id");
BranchId =Convert.ToInt32(Console.ReadLine());
Console.WriteLine("Enter Branch Name");
BranchName = Console.ReadLine();
Console.WriteLine("Enter Branch Address");
BranchAddress = Console.ReadLine();
}
public void DisplayBranchData()
{
Console.WriteLine("Branch Details Are ");
Console.WriteLine("Branch Id :" + BranchId);
Console.WriteLine("Branch Name :" + BranchName);
Console.WriteLine("Enter Branch Address :" + BranchAddress);
}
}
class Employee : Branch // Dervied Class
{
int EmpId;
string EmpName;
string EmpAddress;
int Empage;
public void GetEmpData()
{
Console.WriteLine("Enter Employee Id");
EmpId = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("Enter Employee Name");
EmpName = Console.ReadLine();
Console.WriteLine("Enter Employee Address");
EmpAddress= Console.ReadLine();
Console.WriteLine("Enter Employee Age");
Empage =Convert.ToInt32(Console.ReadLine());
}
public void DisplayEmpData()
{
Console.WriteLine("Employee Details Are ");
Console.WriteLine("Employee Id :" + EmpId);
Console.WriteLine("Employee Name :" + EmpName);
Console.WriteLine("Employee Address :" + EmpAddress);
Console.WriteLine("Employee Age :" + Empage);
}
}
class Salary:Employee
{
double Basic, DA, HRA, Gross;
public void GetSalary()
{
Console.WriteLine("Enter Basic Salary:");
Basic = Convert.ToDouble(Console.ReadLine());
DA=Basic*0.03;
HRA=Basic*0.3;
Gross = Basic + DA + HRA;
}
public void DisplaySalary()
{
Console.WriteLine("Salary Details Are ");
Console.WriteLine("Basic Salary:"+Basic);
Console.WriteLine("DA:"+DA);
Console.WriteLine("HRA:" + HRA);
Console.WriteLine("Gross Salary:" + Gross);
}
}
class Program
{
static void Main(string[] args)
{
Salary ObjSalary = new Salary();
ObjSalary.GetBranchData();
ObjSalary.GetEmpData();
ObjSalary.GetSalary();
ObjSalary.DisplayBranchData();
ObjSalary.DisplayEmpData();
ObjSalary.DisplaySalary();
}
}
Output :-
Enter Branch Id
1
Enter Branch Name
Axis
Enter Branch Address
Mumbai
Enter Employee Id
41
Enter Employee Name
John
Enter Employee Address
Mumbai
Enter Employee Age
25
Enter Basic Salary:
15000
Branch Details Are
Branch Id :1
Branch Name :Axis
Enter Branch Address :Mumbai
Employee Details Are
Employee Id :41
Employee Name :John
Employee Address :Mumbai
Employee Age :25
Salary Details Are
Basic Salary:15000
DA:450
HRA:4500
Gross Salary:19950
Press any key to continue . . .
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