New Features in .NET 4.5 and 5.0

Here we are explaining the following features:

1. Parallel.ForEach
 
 Parallel.ForEach is a feature introduced by the Task Parallel Library (TPL). This feature helps you run your loop in parallel. You need to have a multi-processor to use of this feature.
 
 Simple foreach loop

foreach (string i in listStrings)
 {
  ..........
 }

Parallel foreach

 Parallel.Foreach(listStrings, text=>
 {
 ……………………..
 });
 

 2. BigInteger
 
 BigInteger is added as a new feature in the System.Numerics DLL. It is an immutable type that represents a very large integer whose value has no upper or lower bounds.

BigInteger obj = new BigInteger("123456789123456789123456789");

 
 3. ExpandoObject
 
 The ExpandoObject is part of the Dynamic Language Runtime (DLR). One can add and remove members from this object at run time.
 
 Create a dynamic instance.

dynamic Person = new ExpandoObject();
 Person.ID = 1001;
 Person.Name = "Princy";
 Person.LastName = “Gupta”;
 

4. Named and Optional Parameters
 
 Optional Parameters
 
 A developer can now have some optional parameters by providing default values for them. PFB how to create optional parameters.

Void PrintName(string a, string b, string c = “princy”)
 {
  Console.Writeline(a, b, c)
 }
 

We can now call the function PrinctName() by passing either two or three parameters as in the following:

PrintName(“Princy”,”Gupta”,”Jain”);
 PrinctName(“Princy”,”Gupta”);

 Output
 
 PrincyGuptaJain
 PrincyGuptaprincy
 
 Note: An optional parameter can only be at the end of the parameter list.
 
 Named Parameters
 
 With this new feature the developer can pass values to parameters by referring to parameters by names.

Void PrintName(string A, string B
 {
 }

Function call

PrintName (B: “Gupta”, A: “Princy”);

With this feature we don't need to pass parameters in the same order to a function.
 
 5. Tuple
 
 A Tuple provides us the ability to store various types in a single object.
 
 The following shows how to create a tuple.

Tuple<int, string, bool> tuple = new Tuple<int, string, bool>(1,"princy", true);
 Var tupleobj = Tuple.Create(1, "Princy", true);

In order to access the data inside the tuple, use the following:

string name = tupleobj.Item2;
 int age = tupleobj.Item1;
 bool obj = tupleobj.Item3;

Source: C# Corner