Line continue character in C

Question

We have a unit test with variable that contains a very long string   Question is how to write this in code  without having problems with line breaks or that the code is difficult to read   In VB there is a line continue character  is there an equivilant in C

User · Answer

If you declared different variables then use following simple method   Int salary 2000   String abc  I Love Pakistan    Double pi 3 14   Console Writeline salary   n  abc   n  pi  Console readkey

User · Answer

String Constants  Just use the   operator and break the string up into human-readable lines  The compiler will pick up that the strings are constant and concatenate them at compile time  See the MSDN C  Programming Guide here   e g   const string myVeryLongString         This is the opening paragraph of my long string           Which is split over multiple lines to improve code readability           but is in fact  just one long string      IL 0003   ldstr        This is the opening paragraph of my long string  Which is split over multiple lines to improve code readability  but is in fact  just one long string    String Variables  Note that when using string interpolation to substitute values into your string  that the   character needs to precede each line where a substitution needs to be made   var interpolatedString         This line has no substitutions             This line uses  count  widgets  and             CountFoos    foos were found      However  this has the negative performance consequence of multiple calls to string Format and eventual concatenation of the strings  marked with       IL 002E   ldstr        This line has no substitutions    IL 0033   ldstr         This line uses  0  widgets  and   IL 0038   ldloc 0        count IL 0039   box         System Int32 IL 003E   call        System String Format     IL 0043   ldstr          0  foos were found   IL 0048   ldloc 1        CountFoos IL 0049   callvirt    System Func lt System Int32 gt  Invoke IL 004E   box         System Int32 IL 0053   call        System String Format     IL 0058   call        System String Concat       Although you could either use    to provide a single string and avoid the performance issues  unless the whitespace is placed inside     which looks odd  IMO   this has the same issue as Neil Knight s answer  as it will include any whitespace in the line breakdowns   var interpolatedString      When breaking up strings with     it introduces      lt -  newLine and whitespace here   each time I break the string       lt -  More whitespace   CountFoos    foos were found      The injected whitespace is easy to spot   IL 002E   ldstr        When breaking up strings with     it introduces      lt -  newLine and whitespace here   each time I break the string       lt -  More whitespace   0  foos were found     An alternative is to revert to string Format  Here  the formatting string is a single constant as per my initial answer   const string longFormatString         This is the opening paragraph of my long string with  0  chars           Which is split over multiple lines to improve code readability           but is in fact  just one long string with  1  widgets      And then evaluated as such   string Format longFormatString  longFormatString Length  CountWidgets       However this can still be tricky to maintain given the potential separation between the formatting string and the substitution tokens

User · Answer

In his excellent answer  StuartLC cites an answer to a related question and mentions that placing newlines inside the  expression  of an interpolated string  quot looks odd  quot  Most would agree  but the unpleasant source code effect can be mitigated somewhat--and without any runtime consequences--by using dedicated  expression  blocks which resolve to default String   that is  null  and specifically not String Empty   The  albeit minor  point is to not mess-up or pollute your actual expression content  by instead using a dedicated token for this purpose  So if you declare a constant  for example  const String more   null      then a line which might be too long to look at in source code  such as    var s1     quot one   99   1  two   99   2  three   99   3  four   99   4  five   99   5  six   99   6  quot       can be instead written like this  var s2      quot  more      one   99   1   more      two   99   2   more      three   99   3   more      four   99   4   more      five   99   5   more      six   99   6  quot    Or perhaps you prefer a different  quot odd quot  approach to the same thing     elsewhere  public const String     null      Unicode   u039E   Greek  Capital Letter Xi      anywhere  var s3      quot                one   99   1                 two   99   2                 three   99   3                 four   99   4                 five   99   5                 six   99   6  quot    Actually  it looks like we can also do it without a continuation symbol  var s4      quot one   99   1              two   99   2              three   99   3              four   99   4              five   99   5              six   99   6  quot    All four examples produce the same string at runtime  which in this case is all on a single line   one  100 two  101 three  102 four  103 five  104 six  105  As Stuart suggested  IL performance is preserved in both these examples by not using   to concatenate strings  Although the longer format string in my new example is indeed stored in the IL  and thus your executable  the null placeholders it references are not initialized  and there are no excess concatenations or function calls at runtime  For comparison  here is the IL for the above two examples  IL for first example ldstr  quot one   0  two   1  three   2  four   3  five   4  six   5  quot  ldc i4 6 newarr object dup ldc i4 0 ldc i4 s 100 box int32 stelem ref dup ldc i4 1 ldc i4 s 101 box int32 stelem ref dup ldc i4 2 ldc i4 s 102 box int32 stelem ref dup ldc i4 3 ldc i4 s 103 box int32 stelem ref dup ldc i4 4 ldc i4 s 104 box int32 stelem ref dup ldc i4 5 ldc i4 s 105 box int32 stelem ref call string string  Format string  object     IL for second example ldstr  quot  0 one   1   2 two   3   4 three   5   6 four   7   8 five   9   10 six   11  quot  ldc i4 s 12 newarr object dup ldc i4 1 ldc i4 s 100 box int32 stelem ref dup ldc i4 3 ldc i4 s 101 box int32 stelem ref dup ldc i4 5 ldc i4 s 102 box int32 stelem ref dup ldc i4 7 ldc i4 s 103 box int32 stelem ref dup ldc i4 s 9 ldc i4 s 104 box int32 stelem ref dup ldc i4 s 11 ldc i4 s 105 box int32 stelem ref call string string  Format string  object

User · Answer

You can use verbatim literals   const string test     Test 123 456      But the indentation of the 1st line is tricky ugly

User · Answer

string here that is long you mean    But be careful  because    string here            and space before this text      means the space is also a part of the string    It also escapes things in the string    c   folder     c   folder   c  folder     c  folder  c   folder     c  folder   Related   What does the   symbol before a variable name mean in C   MSDN string reference

User · Answer

C  will allow you to have a string split over multiple lines  the term is called verbatim literal   string myString     this is a                     test                    to see how long my string                    can be                        and it can be quite long     If you are looking for the alternative to  amp    from VB  use the   to join your lines

User · Answer

You must use one of the following ways       string s     loooooooooooooooooooooooong loooooong                   long long long    string s    loooooooooong loooong                 long long

[c#] Line continue character in C#

Examples related to c#