Different between Anonymous and Named types

Anonymous

In general anonymous types of declared with var keyword like

var a =10;

var b=20.5;

var c=”sai”;

What we use the data type in C# like int, string, double etc. are known as “named types”.

Anonymous types are introduced in 2.0 versions of .net frame work and C#.

Anonymous types cannot be used as Global variables

Initialize the data into anonymous type is mandatory.

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Different between Anonymous and Named types

 

Named Type	Anonymous
Type is known at source time	Type is known at compile time
User/ programmer will decide the type of the variable	Compiler will decide the type of the variable
Use respective type keyword to create a variable with names type	Use var keyword to create a variable with anonymous type
Can be used as a local /global variable	Can be used as a local variables only and can’t be used as a global variable data field of the class
Can be used in any context	Can be used in following situations As local variable In for loop initialization In for each loop initialization In using statement
Initialization of variable is optional	Initialization of variable is mandatory
In case of number types can be used with increment/decrement unary operator	In case of number types cannot be used with increment/ decrement unary operator  -> for a = a++ produces compile time error
Multiple variables can be declared in same statement like object a=10,b= “sai” , c= 10.5	Multiple variable can’t be declared in same statement like var a=10,b= “sai” raises compilation error
Can be used with un safe code	Can’t be used with un safe code
Doesn’t support complex types	Support complex types

Examples with Anonymous types:

Name space CA sample
{
Class sample
{
Static void main ()
{
Var a=”10”;
Var b=”sai”;
Var c=”10.5”;
c.w.l(“value of a :-“+a);
c.w.l(“value of b :-“+b);
c.w.l(“value of c :-“+c);
console.read();
}
}
}

2. Create an array and print elements using Anonymous type?

Name space CA sample
{
Class sample
{
Static void main ()
{
Int []A=new int [6]{10,20,30,40,50,60};
String []B=new string[3]{“sai”,”Ram”,”krishna”};
c.w.l(“elements of array A are:-”);
for each (var X in A)
c.write (X+” “);
c.wl (“/n element of array B are:-“);
for each (var X in B)
console write (X+” “);
console read ();
}
}
}
Name space CA sample
{
Class example3
{
Static void main ()
{
Var Pname =New {Sname=”Sachin”, Fname=”Ramesh”, Lname=”tendulker”};
Var DOB=new {Day=14, month=”April”, year=1973};
c.w.l(“person name is:-”+Pname.fname+Pname.Lname);
c.w.l(“DOB is:-”+DOB.month+”-”+DOB.year);
c.Read();
}
}
}