Why is Convert.ToBoolean ("0") not working?

Question

I know that an attempt to convert the string "0" to boolean will fail, I also know how to fix it, thanks to John Skets answers on other questions.

What I would like to know is WHY C # does not recognize “0” as a valid input for a logical conversion, of course, you can look at it as 0 = false, 1 = true or even -1 = false and 0 = true in any case, my logic tells me that this can be a valid input, so is there a good reason why it is not? My old vb6 bet will be able to recognize the string input "0" as valid.

Answer 1

The simple answer is that this is how a method is defined. However, C # 0 does not evaluate to false , so it would be surprising if "0" were to be converted to false using Convert.

Answer 2

a string with a value always returns true and even an empty string.

Answer 3

I assume that this is because the C programmer switching to the .NET language can be confused, since in C the direct leaflet of the character "0" will be evaluated as "true", while the character "\ 0" will be evaluated as false.

(This is because the null character is actually a byte full of zeros, and the character "0" is non-zero ASCII / Unicode / etc.)

Answer 4

This is pretty straight forward, Convert.ToBoolean (String) calls Boolean.TryParse (). Which accepts only "Truth" or "False." If you want to expand the parameters, then you can, there are .NET languages ​​that have a more flexible type system. This is well supported by the .NET platform:

  bool b = (bool)Microsoft.VisualBasic.CompilerServices.Conversions.ToBoolean("0"); 

Add link to Microsoft.VisualBasic.dll

Answer 5

For the same reason that the following code will not compile.

 bool value = 0; //error CS0031: Constant value '0' cannot be converted to a 'bool' 

Answer 6

http://msdn.microsoft.com/en-us/library/86hw82a3.aspx
According to the msdn link above, this method Converts the specified string representation of a boolean value to its Boolean equivalent.

 public static bool ToBoolean( string value ) 

Options

value Type: System.String A string containing the value Boolean.TrueString or Boolean.FalseString . Return value

Type: System.Boolean true if the value is TrueString, or false if the value is FalseString or null. Exceptions

Answer 7

Whenever you give "0" as a parameter, it considers this a string value. And the string cannot be converted to bool, it doesn't matter if it is 0 or 1 .