C# | Boolean.Parse() Method
Last Updated :
13 Sep, 2021
This method is used to convert the specified string representation of a logical value to its Boolean equivalent.
Syntax:
public static bool Parse (string value);
Here, the value is the string which contains the value to convert.
Return Value: This method returns true if value is equivalent to TrueString false if value is equivalent to FalseString.
Exceptions:
- ArgumentNullException: If the string value is null.
- FormatException: If the value is not equivalent to TrueString or FalseString.
Below programs illustrate the use of Boolean.Parse(String) Method:
Example 1:
CSHARP
// C# program to demonstrate
// Boolean.Parse(String)
// Method
using System;
class GFG {
// Main Method
public static void Main()
{
try {
// passing different values
// to the method to check
checkParse("true");
checkParse("TRUE");
checkParse("false");
checkParse("FALSE");
checkParse(bool.TrueString);
checkParse(bool.FalseString);
}
catch (ArgumentNullException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
catch (FormatException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
}
// Defining checkParse method
public static void checkParse(string input)
{
// declaring bool variable
bool val;
// getting parsed value
val = bool.Parse(input);
Console.WriteLine("'{0}' parsed as {1}", input, val);
}
}
Output: 'true' parsed as True
'TRUE' parsed as True
'false' parsed as False
'FALSE' parsed as False
'True' parsed as True
'False' parsed as False
Example 2: For ArgumentNullException
CSHARP
// C# program to demonstrate
// Boolean.Parse(String)
// Method for ArgumentNullException
using System;
class GFG {
// Main Method
public static void Main()
{
try {
// passing null value as a input
checkParse(null);
}
catch (ArgumentNullException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
catch (FormatException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
}
// Defining checkparse method
public static void checkParse(string input)
{
// declaring bool variable
bool val;
// getting parsed value
val = bool.Parse(input);
Console.WriteLine("'{0}' parsed as {1}", input, val);
}
}
Output: Exception Thrown: System.ArgumentNullException
Example 3: For FormatException
CSharp
// C# program to demonstrate
// Boolean.Parse(String)
// Method for FormatException
using System;
class GFG {
// Main Method
public
static void Main()
{
try {
// passing true is not equivalent
// to true value as a input
checkParse("true");
}
catch (ArgumentNullException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
catch (FormatException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
}
// Defining checkParse method
public static void checkParse(string input)
{
// declaring bool variable
bool val;
// getting parsed value
val = bool.Parse(input);
Console.WriteLine("'{0}' parsed as {1}", input, val);
}
}
Output: Exception Thrown: System.FormatException
Note: The value parameter, optionally preceded or trailed by white space, must contain either TrueString or FalseString otherwise, it will throw an exception and the comparison is case-insensitive.
Reference: