Analysis of c#6.0 grammatical sugars

1. Automatic attribute default initialization

Using code

 Public string Get Set " 001 ";

Compiler-Generated code:

 Public classCustomer {[compilergenerated]Private stringKbackingfield ="Hello World";  PublicCustomer () { This. Kbackingfield ="Hello World"; } Public stringname{[compilergenerated]Get    {        return  This.<name>K__backingfield; } [compilergenerated]Set    {         This. <name>k__backingfield =value; }}}

The compiler initializes the property when the constructor is instantiated.

2. Automatic read-only property default initialization

Using code

 Public string Get " Hello World ";

Compiler-generated code

Private ReadOnly string   public Customer () {    this'helloworld'   Publicstring  Name1 {    [compilergenerated]     get  Returnthis. K__backingfield;}}

The assignment of a read-only property can only be performed in the constructor

3. The function of the expression as the main body

Using code

Private Static void Test () = Console.WriteLine ("Hello world!! " ); Body Get (intintnew Body (12 + y);

Compiler-generated code

Private program.body Get (int x, int y) {    new program.body (12  + y);}

If the function body has only one line of code, the function with the body of the expression is more concise

also supports the writing of asynchronous functions

Async void OutPut (intint,awaitnew Task () = Console.WriteLine ("Hello wolrd"));

4. The expression is the property of the principal (assigned value)

Using code

 Public string " Frank ";

Compiler-generated code

 Public string name{     "Frank";}}

You can see that this property is a read-only property

5. Static class Import

Using code

using Static System.Console; Private Static void Listcontacts (ienumerable<contact> contacts) {    foreach (var in Contacts)    {        WriteLine ("{0,-6}{1,-6}{2,-20}{3,-10}", Contact. Id, contact. Name, contact. EmailAddress, contact. phonenum);    }    WriteLine ();}

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Compiler-generated code

Private Static void Listcontacts (ienumerable<contact> contacts) {    foreach (var in Contacts)    {        Console.WriteLine ("{0,-6}{1,-6}{2,-20}{3,-10}"  , contact. Id, contact. Name, contact. EmailAddress, contact. phonenum);    }    Console.WriteLine ();}

6. Null condition operator

Using code

New Customer (); string name = Customer?. Name;

Compiling code

New Customer (); if NULL ) {    string name = customer. Name;}

Can also and?? Combine them with

if (Customer?. Face ()?? false)

You can also use two combinations together to

Int

The purpose of this syntax sugar is to check for null before the object is used. If the object is empty, the variable is assigned a null value, so an int, or int, that can be empty is required in the example. If the object is not empty, the member of the calling object is evaluated and assigned to the variable.

7. String Formatting

String.Format Some inconvenient place is: Must enter "String.Format", use {0} placeholder, must order to format, this is error-prone.

var string. Format ("id:{0} name:{1} emailaddr:{2} phonenum:{3}", contact. Id, contact. Name, contact. EmailAddress, contact. Phonenum);

The new syntax

var contactInfo2 = $"id:{contact. Id} name:{contact. Name} emailaddr:{contact. EmailAddress} phonenum:{contact. Phonenum}";

Use more handy, praise!

The new format also supports direct assignment of any expression:

var contactinfo = $"Frank"  : Contact. Name)} emailaddr:{contact. EmailAddress} phonenum:{contact. Phonenum}";

Analysis of c#6.0 grammatical sugars