New Features in C# 6.0

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What to expect from this slide?

Microsoft has announced some new keywords and behavior for C# 6.0 in Visual Studio 2015

The features are listed as a comparison between C# 6.0 and C# 5.0

Relevant samples are also provided to get a better understanding of the features.

02

What are new features ?

using Static

Auto property initializer

Dictionary Initializer

nameof Expression

New way for Exception filters

Null – Conditional Operator

Expression–Bodied Methods

Easily format strings – String interpolation

03

1) using static

C# 6.0 allows us to use any class that is static as a namespace. This is very useful for every developer where we need to call the static

methods from a static class

1) Convert.ToInt32()

2) Console.WriteLine()

e.g. code in C# 5.0

Console.WriteLine(“Enter First Number : “);int num1 = Convert.ToInt32(Console.ReadLine());

How to write the same code in C# 6.0

using System.Console;using System.Convert;

WriteLine(“Enter First Number : ”); int mum1 = ToInt32(ReadLine());

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1) using static (cont’d)

C# 5.0 Screenshot C# 6.0 Screenshot

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2) Auto property initializer

C# 5.0 C# 6.0

Auto property initializer is a new concept to set the value of a property during property declaration. We can set default value to

a read-only property, it means a property that has only a {get;} attribute.

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3) Dictionary Initializer

In C# 6.0, the dictionary initialization happens in the same way but with keys as indexers which makes the code easy to read and understandable. Here is a piece of code to show you how the new initializing feature can be used. This is almost similar to how you access them e.g. errorCodes [1] = “Ex000001”.

Here in C# 6.0 we can initialize the Dictionary values directly by the “=” operator and in C# 5.0 we need to create an object as a {key,value} pair and the output will be the same in both versions.

Dictionary Initialization is not a new thing in C#. It was present since C# 3.0, but in C# 6.0 Microsoft enhanced this by adding a new ability to use the key/indexer to map with the dictionary values directly during the initialization itself.The following code snippet shows how dictionary initializer were used prior to C# 6.0 to initialize dictionary objects with key and values. This is still valid and you can use it as earlier.

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3) Dictionary Initializer (cont’d)

C# 6C# 5

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4) nameof - Expression

nameof expression will return a string literal of the name of a property or a method.

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5) Exception filters

Exception filters allow us to specify a condition with a catch block. So the catch block is executed only if the condition is satisfied.

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6) Null-Conditional Operator

Suppose we need to write a code to compare the objects of an employee class with null-conditional operator in C# 5.0, we will need

to write multiple lines of code using if() and else. In C# 6.0, we can rewrite the same code using ? and ?? .

The following sample code shows how to check the null value of an object in C# 6.0

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7) Expression–Bodied Methods

C#5.0 C#6.0

An Expression–Bodied Method is a very useful way to write a function in a new way. By using the “=>“ lamda Operator in C# 6.0, we

can easily write methods with single line.

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8) Easily format strings using String interpolation

To easily format a string value in C# 6.0 without any string.Format() method we can write a format for a string. It's a very useful and

time saving process to define multiple string values by

$“{ variable }”.

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