What does mean before a string

Question

I was going to use verbatim string but i mistakenly typed   instead of     But the Compiler didn t give me any Error and Compiled successfully   I want to know what it is and what it does  I searched for it but i couldn t find anything   However it is not like a verbatim string because I can t write   string str     text      Does anyone know what   before string stand for in C    string str     text     I m using Visual studio 2015 CTP

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It creates an interpolated string   From MSDN     Used to construct strings  An interpolated string expression looks   like a template string that contains expressions  An interpolated   string expression creates a string by replacing the contained   expressions with the ToString represenations of the expressions      results    ex     var name    Sam    var msg     hello   name      Console WriteLine msg      hello  Sam   You can use expressions within the interpolated string   var msg     hello   name ToLower       Console WriteLine msg      hello  sam   The nice thing about it is that you don t need to worry about the order of parameters as you do with String Format     var s   String Format   0   1   2     88   p0 p1    p88     Now if you want to remove some parameters you have to go and  update all the counts  which is not the case anymore   Note that the good old string format is still relevant if you want to specify cultural info in your formatting

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I don t know how it works  but you can also use it to tab your values    Example    Console WriteLine   I can tab like   this     5        Of course  you can replace  this    with any variable or anything meaningful  just as you can also change the tab

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Example Code  public class Person       public String firstName   get  set        public String lastName   get  set          Instantiate Person var person   new Person   firstName    Albert   lastName    Einstein         We can print fullname of the above person as follows Console WriteLine  Full-Name -     person firstName         person lastName   Console WriteLine  Full-Name -  0   1    person firstName  person lastName   Console WriteLine   Full-Name -  person firstName   person lastName       Output  Full-Name - Albert Einstein Full-Name - Albert Einstein Full-Name - Albert Einstein     It is Interpolated Strings  You can use an interpolated string anywhere you can use a string literal  When running your program would execute the code with the interpolated string literal  the code computes a new string literal by evaluating the interpolation expressions  This computation occurs each time the code with the interpolated string executes   Following example produces a string value where all the string interpolation values have been computed  It is the final result and has type string  All occurrences of double curly braces           and           are converted to a single curly brace   string text    World   var message     Hello   text      After executing above 2 lines  variable message contains  Hello  World    Console WriteLine message      Prints Hello  World   Reference - MSDN

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The following example highlights various advantages of using interpolated strings over string Format   as far as cleanliness and readability goes   It also shows that code within    gets evaluated like any other function argument  just as it would if string Format   we re being called   using System   public class Example      public static void Main              var name    Horace         var age   34           replaces  name  with the value of name   Horace        var s1     He asked    Is your name  name      but didn t wait for a reply          Console WriteLine s1             as age is an integer  we can use   D3  to denote that          it should have leading zeroes and be 3 characters long          see https   docs microsoft com en-us dotnet standard base-types how-to-pad-a-number-with-leading-zeros                    age    1         s   uses the ternary operator to           decide the value used in the placeholder  the same           as if it had been placed as an argument of string Format                   finally  it shows that you can actually have quoted strings within strings          e g    outer    inner    string        var s2      name  is  age D3  year  age    1         s    old          Console WriteLine s2              The example displays the following output           He asked   Is your name Horace    but didn t wait for a reply           Horace is 034 years old

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Cool feature  I just want to point out the emphasis on why this is better than string format if it is not apparent to some people   I read someone saying order string format to   0   1   2   to match the parameters  You are not forced to order   0   1   2   in string format  you can also do   2   0   1    However  if you have a lot of parameters  like 20  you really want to sequence the string to   0   1   2       19    If it is a shuffled mess  you will have a hard time lining up your parameters   With    you can add parameter inline without counting your parameters  This makes the code much easier to read and maintain   The downside of   is  you cannot repeat the parameter in the string easily  you have to type it  For example  if you are tired of typing System Environment NewLine  you can do string format      0     0     0    System Environment NewLine   but  in    you have to repeat it  You cannot do    0   and pass it to string format because    0   returns  0    On the side note  I have read a comment in another duplicated tpoic  I couldn t comment  so  here it is  He said that  string msg   n     sheep      m     chickens     creates more than one string objects  This is not true actually  If you do this in a single line  it only creates one string and placed in the string cache   1  string   string   string   string  2  string format   3  stringBuilder ToString   4        All of them return a string and only creates one value in the cache   On the other hand   string   string2  string   string2  string   string2  string   string2    Creates 4 different values in the cache because there are 4       Thus  it will be easier to write code like the following  but you would create five interpolated string as Carlos Mu  oz corrected   string msg     Hello this is  myName           My phone number  myPhone           My email  myEmail           My address  myAddress   and         My preference  myPreference       This creates one single string in the cache while you have very easy to read code  I am not sure about the performance  but  I am sure MS will optimize it if not already doing it

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the   sign in the string is for definition of interpolation string that is a feature in C  to interpolate the string is a  true string  that might contain interpolated expressions  for further information this is the source of the answer and example  https   docs microsoft com en-us dotnet csharp language-reference tokens interpolated

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syntax is nice  but with one downside   If you need something like a string template  that is declared on the class level as field   well in one place as it should be   Then you have to declare the variables on the same level   which is not really cool   It is much nicer to use the string Format syntax for this kind of things  class Example1 StringFormat    string template      0  -  1      public string FormatExample1        string some1    someone      return string Format template  some1   inplacesomethingelse         public string FormatExample2        string some2    someoneelse      string thing2    somethingelse      return string Format template  some2  thing2          The use of globals is not really ok and besides that - it does not work with globals either    static class Example2 Format      must have declaration in same scope  static string some        static string thing        static string template      some  -  thing       This returns   -   and not  someone - something  as you would maybe    expect  public static string FormatExample1        some    someone      thing    something      return template        This returns   -   and not  someoneelse- somethingelse  as you would    maybe expect  public static string FormatExample2        some    someoneelse      thing    somethingelse      return template

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It is more convenient than string Format and you can use intellisense here too     And here is my test method    TestMethod  public void StringMethodsTest DollarSign         string name    Forrest       string surname    Gump       int year   3       string sDollarSign     My name is  name   surname  and once I run more than  year  years         string expectedResult    My name is Forrest Gump and once I run more than 3 years         Assert AreEqual expectedResult  sDollarSign

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Note that you can also combine the two  which is pretty cool  although it looks a bit odd       simple interpolated verbatim string WriteLine    Path   C  Windows  file    not found

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It signifies string interpolation   It will protect you because it is adding compilation time protection on the string evaluation   You will no longer get an exception with string Format   0  1   secondParamIsMissing

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is short-hand for String Format and is used with string interpolations  which is a new feature of C  6  As used in your case  it does nothing  just as string Format   would do nothing   It is comes into its own when used to build strings with reference to other values  What previously had to be written as   var anInt   1  var aBool   true  var aString    3   var formated   string Format   0   1   2    anInt  aBool  aString     Now becomes   var anInt   1  var aBool   true  var aString    3   var formated      anInt   aBool   aString      There s also an alternative - less well known - form of string interpolation using      the order of the two symbols is important   It allows the features of a     string to be mixed with     to support string interpolations without the need for    throughout your string  So the following two lines   var someDir    a   Console WriteLine    c   someDir  b c      will output   c  a b c

[c#] What does $ mean before a string?

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