C# | Boolean.Parse() Method

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:

• https://docs.microsoft.com/en-us/dotnet/api/system.boolean.parse?view=netframework-4.7.2