Microsoft
provides three ready-made generics delegate. This is call shorter and sweeter
delegate. This to minimize the code complexity of the apps.
1.
Func<
input, output >
2.
Action<
inputParameter >
3.
Predicate<
inputParameter >
Func <input, output
> Delegate:-
The Func <input,
output> generic delegate is use, when you need to some input parameter and
then return some output.
The
example for Func generic delegate as given below,
namespace GenericDelegate
{
public class Delegates
{
static void Main(string[] args)
{
// int is a input parameter and double is output parameter
Func<int, double> calPiR2Obj = r
=> 3.12 * r * r;
Console.Write(calPiR2Obj(4));
Console.ReadLine();
}
}
}
Action<
inputParameter > Delegate:-
The Action< inputParameter> generics delegate is use, when you need to input parameter and no need to return output that means return void.
The
example for Action generics delegate as below,
namespace GenericDelegate
{
public class Delegates
{
static void Main(string[] args)
{
Action<string> ActionObject = x
=> Console.WriteLine(x);
ActionObject("This is Action
delegate!");
Console.ReadLine();
}
}
}
Predicate
< inputParameter > Delegate:-
The Predicate generics delegate is use, when you need to input parameter and return output.
The return
output is Boolean type just like true
or false. This delegate is uses when you need to check the conditional
statements are true or false.
The example for Predicate delegate as below,
namespace GenericDelegate
{
public class Delegates
{
static void Main(string[] args)
{
// string is input but out put is retun True or False
Predicate<string>
checkConditionIsTF = x => x.Length > 10;
Console.WriteLine(checkConditionIsTF("Anil Kumar Singh"));
Console.ReadLine();
}
}
}
The example for Generic Delegates:-
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace GenericDelegate
{
public class Delegates
{
static void Main(string[] args)
{
//Int is an input parameter and double is output parameter.
Func<int, double > calPiR2Obj
= r => 3.12 * r * r;
Console.WriteLine(calPiR2Obj(4));
//String is input but no output return.
Action<string > ActionObject
= x => Console.WriteLine(x);
ActionObject("This is Action delegate!");
//String is input but output, the return is true or false
Predicate< string >
checkConditionIsTF = x => x.Length > 10;
Console.WriteLine(checkConditionIsTF("Anil Kumar Singh"));
Console.ReadLine();
}
}
}
I hope it is very useful to you! Thank you!
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Anil Singh is an author, tech blogger, and software programmer. Book writing, tech blogging is something do extra and Anil love doing it. For more detail, kindly refer to this link..
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