var Type:
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The primary reason for its existence is the introduction of anonymous types in C#
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Another point to stress is that variable inference does not work for class level fields or method arguments or anywhere else other than for local variables in a method.
Advantages :
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Less typing with no loss of functionality
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Increases the type safety of your code. A foreach loop using an iteration variable which is typed to var will catch silently casts that are introduced with explicit types
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Makes it so you don't have to write the same name twice in a variable declaration.
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Some features, such as declaring a strongly typed anonymous type local variable, require the use of var
Example 1:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Namesp1
{
class Program
{
static void Main(string[] args)
{
var x = Convert.ToInt32(Console.ReadLine());
var y = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("The Sum Is : " + (x + y));
}
}
}
Example 2:
using System;
namespace ConsoleApplication1
{
class A
{
public static void Main()
{
int sum = 0;
int[] arr = new int[10];
for (int i = 0; i < 10; i++)
{
arr[i] = i;
}
foreach (var x in arr)
{
Console.WriteLine("Value is: " + x);
sum =sum + x;
}
Console.WriteLine("Sum of array elements is : " + sum);
}
}
}
Output: