how to convert a string to a bool

Question

I have a string that can be either  0  or  1   and it is guaranteed that it won t be anything else   So the question is  what s the best  simplest and most elegant way to convert this to a bool

User · Answer

If you want to test if a string is a valid Boolean without any thrown exceptions you can try this :

    string stringToBool1 = "true";
    string stringToBool2 = "1";
    bool value1;
    if(bool.TryParse(stringToBool1, out value1))
    {
        MessageBox.Show(stringToBool1 + " is Boolean");
    }
    else
    {
        MessageBox.Show(stringToBool1 + " is not Boolean");
    }

outputis Boolean and the output for stringToBool2 is : 'is not Boolean'

User · Answer

I use this   public static bool ToBoolean this string input                          Account for a string that does not need to be processed             if  string IsNullOrEmpty input                   return false               return  input Trim   ToLower       true       input Trim       1

User · Answer

private static readonly ICollection lt string gt  PositiveList   new Collection lt string gt     Y    Yes    T    True    1    OK      public static bool ToBoolean this string input                    return input    null  amp  amp  PositiveList Any     gt    Equals input  StringComparison OrdinalIgnoreCase

User · Answer

I made something a little bit more extensible  Piggybacking on Mohammad Sepahvand s concept       public static bool ToBoolean this string s                string   trueStrings      1    y     yes     true             string   falseStrings      0    n    no    false               if  trueStrings Contains s  StringComparer OrdinalIgnoreCase               return true          if  falseStrings Contains s  StringComparer OrdinalIgnoreCase               return false           throw new InvalidCastException  only the following are supported for converting strings to boolean                   string Join      trueStrings                  and                 string Join      falseStrings

User · Answer

I used the below code to convert a string to boolean    Convert ToBoolean Convert ToInt32 myString

User · Answer

I love extension methods and this is the one I use     static class StringHelpers       public static bool ToBoolean this String input  out bool output                  Set the default return value         output   false             Account for a string that does not need to be processed         if  input    null    input Length  lt  1              return false           if   input Trim   ToLower       true       input Trim       1                output   true          else if   input Trim   ToLower       false       input Trim       0                output   false          else             return false             Return success         return true            Then to use it just do something like     bool b  bool myValue  data    1   if   data ToBoolean out b     throw new InvalidCastException  Could not cast to bool value from data      data          else   myValue   b     myValue is True

User · Answer

Ignoring the specific needs of this question  and while its never a good idea to cast a string to a bool  one way would be to use the ToBoolean   method on the Convert class   bool val    Convert ToBoolean  true     or an extension method to do whatever weird mapping you re doing   public static class StringExtensions       public static bool ToBoolean this string value                switch  value ToLower                          case   true                   return true              case  t                   return true              case  1                   return true              case  0                   return false              case  false                   return false              case  f                   return false              default                  throw new InvalidCastException  You can t cast that value to a bool

User · Answer

I know this doesn t answer your question  but just to help other people  If you are trying to convert  true  or  false  strings to boolean   Try Boolean Parse  bool val   Boolean Parse  true       gt  true bool val   Boolean Parse  True       gt  true bool val   Boolean Parse  TRUE       gt  true bool val   Boolean Parse  False       gt  false bool val   Boolean Parse  1       gt  Exception  bool val   Boolean Parse  diffstring       gt  Exception

User · Answer

Here s my attempt at the most forgiving string to bool conversion that is still useful  basically keying off only the first character   public static class StringHelpers            lt summary gt          Convert string to boolean  in a forgiving way           lt  summary gt           lt param name  stringVal  gt String that should either be  True    False    Yes    No    T    F    Y    N    1    0  lt  param gt           lt returns gt If the trimmed string is any of the legal values that can be construed as  true   it returns true  False otherwise  lt  returns gt      public static bool ToBoolFuzzy this string stringVal                string normalizedString    stringVal  Trim       false   ToLowerInvariant            bool result    normalizedString StartsWith  y                   normalizedString StartsWith  t                  normalizedString StartsWith  1             return result

User · Answer

bool b   str Equals  1    true   false    Or even better  as suggested in a comment below   bool b   str Equals  1

User · Answer

Quite simple indeed   bool b   str     1

[c#] how to convert a string to a bool

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