how to convert string to bool

deepak

11y4.3kVisual Basic .NET

string yes no convert into bool true and false

5 Replies

Know the answer? Post it — somebody with the same question will find it here.

Yi Rong Tan11y ago
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;
}
0
Vulpes11y ago
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();
}
}
0
theLizard11y ago
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.
0
Armin Hafizovic11y ago
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.
0
Vulpes11y ago
You could do this:

string yn = "yes" ; // or "no"
bool b = (yn.ToLower() == "yes");
0

how to convert string to bool

deepak

11y4.3kVisual Basic .NET

string yes no convert into bool true and false

5 Replies

Know the answer? Post it — somebody with the same question will find it here.

Yi Rong Tan11y ago
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;
}
0
Vulpes11y ago
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();
}
}
0
theLizard11y ago
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.
0
Armin Hafizovic11y ago
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.
0
Vulpes11y ago
You could do this:

string yn = "yes" ; // or "no"
bool b = (yn.ToLower() == "yes");
0