Boolean.TryParse Method

Definition

Overloads

TryParse(ReadOnlySpan<Char>, Boolean)

Tries to convert the specified span representation of a logical value to its Boolean equivalent.

TryParse(String, Boolean)

Tries to convert the specified string representation of a logical value to its Boolean equivalent.

TryParse(ReadOnlySpan<Char>, Boolean)

Source:
Boolean.cs
Source:
Boolean.cs
Source:
Boolean.cs

Tries to convert the specified span representation of a logical value to its Boolean equivalent.

C#
public static bool TryParse (ReadOnlySpan<char> value, out bool result);

Parameters

value
ReadOnlySpan<Char>

A span containing the characters representing the value to convert.

result
Boolean

When this method returns, if the conversion succeeded, contains true if value is equal to TrueString or false if value is equal to FalseString. If the conversion failed, contains false. The conversion fails if value is null or is not equal to the value of either the TrueString or FalseString field.

Returns

true if value was converted successfully; otherwise, false.

Applies to

.NET 9 and other versions
Product Versions
.NET Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9
.NET Standard 2.1

TryParse(String, Boolean)

Source:
Boolean.cs
Source:
Boolean.cs
Source:
Boolean.cs

Tries to convert the specified string representation of a logical value to its Boolean equivalent.

C#
public static bool TryParse (string value, out bool result);
C#
public static bool TryParse (string? value, out bool result);

Parameters

value
String

A string containing the value to convert.

result
Boolean

When this method returns, if the conversion succeeded, contains true if value is equal to TrueString or false if value is equal to FalseString. If the conversion failed, contains false. The conversion fails if value is null or is not equal to the value of either the TrueString or FalseString field.

Returns

true if value was converted successfully; otherwise, false.

Examples

The following example calls the TryParse 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.

C#
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) {
         bool flag;
         if (Boolean.TryParse(value, out flag))
            Console.WriteLine("'{0}' --> {1}", value, flag);
         else
            Console.WriteLine("Unable to parse '{0}'.",
                              value == null ? "<null>" : value);
      }
   }
}
// The example displays the following output:
//       Unable to parse '<null>'.
//       Unable to parse ''.
//       'True' --> True
//       'False' --> False
//       'true' --> True
//       'false' --> False
//       '    true    ' --> True
//       Unable to parse '0'.
//       Unable to parse '1'.
//       Unable to parse '-1'.
//       Unable to parse 'string'.

Remarks

The TryParse method is like the Parse method, except the TryParse method does not throw an exception if the conversion fails.

The value parameter can be preceded or followed by white space. The comparison is ordinal and case-insensitive.

See also

Applies to

.NET 9 and other versions
Product Versions
.NET Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9
.NET Framework 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 2.0, 2.1
UWP 10.0