Boolean.Parse Method
Converts the specified string representation of a logical value to its Boolean equivalent, or throws an exception if the string is not equal to the value of Boolean.TrueString or Boolean.FalseString.
Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Parameters
- value
- Type: System.String
A string containing the value to convert.
Return Value
Type: System.Booleantrue if value is equal to the value of the Boolean.TrueString field; false if value is equal to the value of the Boolean.FalseString field.
| Exception | Condition |
|---|---|
| ArgumentNullException | value is null. |
| FormatException | value is not equal to the value of the TrueString or FalseString field. |
The value parameter, optionally preceded or trailed by white space, must contain a string that is equal to the value of either the Boolean.TrueString or Boolean.FalseString field; otherwise, a FormatException is thrown. The comparison is ordinal and case-insensitive.
The following example calls the Parse method to parse an array of strings. Note that the parse operation succeeds only if the string to be parsed is "True" (the value of the TrueString field) or "False" (the value of the FalseString field) in a case-insensitive comparison.
using System; public class Example { public static void Main() { string[] values = { null, String.Empty, "True", "False", "true", "false", " true ", "0", "1", "-1", "string" }; foreach (var value in values) { try { bool flag = Boolean.Parse(value); Console.WriteLine("'{0}' --> {1}", value, flag); } catch (ArgumentException) { Console.WriteLine("Cannot parse a null string."); } catch (FormatException) { Console.WriteLine("Cannot parse '{0}'.", value); } } } } // The example displays the following output: // Cannot parse a null string. // Cannot parse ''. // 'True' --> True // 'False' --> False // 'true' --> True // 'false' --> False // ' true ' --> True // Cannot parse '0'. // Cannot parse '1'. // Cannot parse '-1'. // Cannot parse 'string'.
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
