New features in C# 6
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The presentation talks about the 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.
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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.](https://image.slidesharecdn.com/newfeaturesinc6-160411124627/85/New-features-in-C-6-7-320.jpg)
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New features in C# 6
- 1. New Features in C# 6.0
- 2. 01 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.
- 3. 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
- 4. 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());
- 5. 04 1) using static (cont’d) C# 5.0 Screenshot C# 6.0 Screenshot
- 6. 05 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.
- 7. 06 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.
- 8. 07 3) Dictionary Initializer (cont’d) C# 6C# 5
- 9. 08 4) nameof - Expression nameof expression will return a string literal of the name of a property or a method.
- 10. 09 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.
- 11. 10 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
- 12. 11 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.
- 13. 12 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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