how to convert string to bool

Question

string yes no convert into bool true and false

Yi Rong Tan · Answer

Hi Deepak, you can try the following: //Let yesNoString be the string containing the "yes" or "no" value //Let yesNoBoolean be the boolean to be converted to. if(yesNoString = "yes") { YesNoBoolean = true; } else if(yesNoString = "no") { yesNoBoolean = false; }

Vulpes · Answer

One other thing you could do is to mimic how the Boolean.TryParse method works: http://msdn.microsoft.com/en-us/library/system.boolean.tryparse%28v=vs.110%29.aspx Here's the code to do that for 'Yes' and 'No' values, ignoring case and leading/trailing whitespace: using System; public static class BoolUtilities { public static bool TryParseYN(string yn, out bool result) { yn = yn.Trim().ToLower(); if (yn == "yes") { result = true; return true; } else if (yn == "no") { result = false; return true; } else { result = false; return false; } } } class Program { static void Main() { while(true) { Console.Write("Enter yes or no : "); bool b; string yn = Console.ReadLine(); if(BoolUtilities.TryParseYN(yn, out b)) { Console.WriteLine("The boolean equivalent is " + b); break; } else { Console.WriteLine("Input is invalid, please try again"); } } Console.ReadKey(); } }

theLizard · Answer

You could try something like this. String value = "Yes" bool result = (value.ToLower()=="yes" ? true:false); or you could create a methode that you could reuse use at will bool myBoolMethod(String a, string b, bool wantTrueFalse) { //compare two strings bool result; a = a.ToLower(); b = b.ToLower() if(wantTrueFalse) result = (a == b? True : False); else result = (a == b? 1 : 0); } bool myBoolMethod(String a, bool wantTrueFalse) { bool result; a = a.ToLower(); if(wantTrueFalse) result = (a == "yes"? True : False); else result = (a == "yes"? 1 : 0); } String MySurname = "Fred", hisSurname = " Smith" then you can do bool myanswer = myBoolMethod(MySurname, hisSurname, true); on return myanswer will be False.

Armin Hafizovic · Answer

This approach is the recommended one and fastest according to Microsoft when you want to compare two strings and retrieve a boolean value for the result. string value = "YES"; // or NO bool result = value.equals("YES", StringComparison.Ordinal); You could also have an enumeration for your values that you will compare a value against which makes your program more flexible, but for just getting a boolean value depending on the result, this code works just fine.

Vulpes · Answer

You could do this: string yn = "yes" ; // or "no" bool b = (yn.ToLower() == "yes");

how to convert string to bool

Answers (5)