NET Format a string with fixed spaces

Question

Does the  NET String Format method allow placement of a string at a fixed position within a fixed length string                String Goes Here        String Goes Here         String Goes Here               How is this done using  NET   Edit - I have tried Format PadLeft PadRight to death   They do not work   I don t know why  I ended up writing my own function to do this   Edit - I made a mistake and used a colon instead of a comma in the format specifier   Should be   0 20     Thanks for all of the excellent and correct answers

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Here s a VB NET version I created  inspired by Joel Coehoorn s answer  Oliver s edit  and shaunmartin s comment        lt Extension   gt  Public Function PadCenter ByVal  string  As String  ByVal width As Integer  ByVal c As Char  As String      If  string  Is Nothing Then  string    String Empty     If  width  lt    string  Length  Then Return  string       Dim padding   width -  string  Length     Return  string  PadLeft  string  Length    padding   2   c  PadRight width  c   End Function   lt Extension   gt  Public Function PadCenter ByVal  string  As String  ByVal width As Integer  As String      If  string  Is Nothing Then  string    String Empty     If  width  lt    string  Length  Then Return  string       Dim padding   width -  string  Length     Return  string  PadLeft  string  Length    padding   2   PadRight width   End Function   This is set up as a string extension  inside a Public Module  the way you do Extensions in VB NET  a bit different than C    My slight change is that it treats a null string as an empty string  and it pads an empty string with the width value  meets my particular needs    Hopefully this will convert easily to C  for anyone who needs it   If there s a better way to reference the answers  edits  and comments I mentioned above  which inspired my post  please let me know and I ll do it - I m relatively new to posting  and I couldn t figure out to leave a comment  might not have enough rep yet

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You ve been shown PadLeft and PadRight   This will fill in the missing PadCenter   public static class StringUtils       public static string PadCenter this string s  int width  char c                if  s    null    width  lt   s Length  return s           int padding   width - s Length          return s PadLeft s Length   padding   2  c  PadRight width  c             Note to self  don t forget to update own CV   One day  I even fixed Joel Coehoorn s code    -D -Serge

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lt summary gt      Returns a string With count chars Left or Right value      lt  summary gt       lt param name  val  gt  lt  param gt       lt param name  count  gt  lt  param gt       lt param name  space  gt  lt  param gt       lt param name  right  gt  lt  param gt       lt returns gt  lt  returns gt   public static string Formating object val  int count  char space        bool right   false        var value   val ToString        for  int i   0  i  lt  count - value Length  i    value   right   value   space   space   value      return value

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I posted a CodeProject article that may be what you want   See  A C  way for indirect width and style formatting   Basically it is a method  FormatEx  that acts like String Format  except it allows a centered alignment modifier   FormatEx   0 c10    value     Means center the value of varArgs 0  in a 10 character wide field  lean right if an extra padding space is required   FormatEx   0 c-10    value     Means center the value of varArgs 0  in a 10 character wide field  lean left if an extra padding space is required   Edit  Internally  it is a combination of Joel s PadCenter with some parsing to restructure the format and varArgs for a call to String Format that does what you want   -Jesse

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Thanks for the discussion  this method also works  VB    Public Function StringCentering ByVal s As String  ByVal desiredLength As Integer  As String     If s Length  gt   desiredLength Then Return s     Dim firstpad As Integer    s Length   desiredLength    2     Return s PadLeft firstpad  PadRight desiredLength  End Function    StringCentering   takes two input values and it returns a formatted string   When length of s is greater than or equal to deisredLength  the function returns the original string  When length of s is smaller than desiredLength  it will be padded both ends    Due to character spacing is integer and there is no half-space  we can have an uneven split of space  In this implementation  the greater split goes to the leading end   The function requires  NET Framework due to PadLeft   and PadRight    In the last line of the function  binding is from left to right  so firstpad is applied followed by the desiredLength pad    Here is the C  version   public string StringCentering string s  int desiredLength        if  s Length  gt   desiredLength  return s      int firstpad    s Length   desiredLength    2      return s PadLeft firstpad  PadRight desiredLength       To aid understanding  integer variable firstpad is used  s PadLeft firstpad  applies the  correct number of  leading white spaces  The right-most PadRight desiredLength  has a lower binding finishes off by applying trailing white spaces

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As of Visual Studio 2015 you can also do this with Interpolated Strings  its a compiler trick  so it doesn t matter which version of the  net framework you target    string value    String goes here   string txt1      value 20    string txt2      value -20

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This will give you exactly the strings that you asked for   string s    String goes here   string lineAlignedRight    String Format   0 27    s   string lineAlignedCenter   String Format   0 -27        String Format   0       27   s Length    2  ToString           s    string lineAlignedLeft     String Format   0 -27    s

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The first and the last  at least  are possible using the following syntax   String Format   0 20     String goes here    String Format   0 -20     String goes here

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try this    String goes here  PadLeft 20        String goes here  PadRight 20         for the center get the length of the string and do padleft and padright with the necessary characters  int len    String goes here  Length  int whites   len  2   String goes here  PadRight len   whites      PadLeft len   whites

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it seems like you want something like this  that will place you string at a fixed point in a string of constant length   Dim totallength As Integer   100 Dim leftbuffer as Integer   5 Dim mystring As String    string goes here  Dim Formatted String as String   mystring PadLeft leftbuffer   mystring Length   -     String Empty PadRight totallength -  mystring Length   leftbuffer    -     note that this will have problems if mystring length   leftbuffer exceeds totallength

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