Convert.ToBoolean Method

Definition

Converts a specified value to an equivalent Boolean value.

Overloads

ToBoolean(SByte)

Converts the value of the specified 8-bit signed integer to an equivalent Boolean value.

ToBoolean(String, IFormatProvider)

Converts the specified string representation of a logical value to its Boolean equivalent, using the specified culture-specific formatting information.

ToBoolean(Object, IFormatProvider)

Converts the value of the specified object to an equivalent Boolean value, using the specified culture-specific formatting information.

ToBoolean(UInt64)

Converts the value of the specified 64-bit unsigned integer to an equivalent Boolean value.

ToBoolean(UInt32)

Converts the value of the specified 32-bit unsigned integer to an equivalent Boolean value.

ToBoolean(UInt16)

Converts the value of the specified 16-bit unsigned integer to an equivalent Boolean value.

ToBoolean(String)

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

ToBoolean(Single)

Converts the value of the specified single-precision floating-point number to an equivalent Boolean value.

ToBoolean(Object)

Converts the value of a specified object to an equivalent Boolean value.

ToBoolean(DateTime)

Calling this method always throws InvalidCastException.

ToBoolean(Int32)

Converts the value of the specified 32-bit signed integer to an equivalent Boolean value.

ToBoolean(Int16)

Converts the value of the specified 16-bit signed integer to an equivalent Boolean value.

ToBoolean(Double)

Converts the value of the specified double-precision floating-point number to an equivalent Boolean value.

ToBoolean(Decimal)

Converts the value of the specified decimal number to an equivalent Boolean value.

ToBoolean(Char)

Calling this method always throws InvalidCastException.

ToBoolean(Byte)

Converts the value of the specified 8-bit unsigned integer to an equivalent Boolean value.

ToBoolean(Boolean)

Returns the specified Boolean value; no actual conversion is performed.

ToBoolean(Int64)

Converts the value of the specified 64-bit signed integer to an equivalent Boolean value.

ToBoolean(SByte)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Important

This API is not CLS-compliant.

Converts the value of the specified 8-bit signed integer to an equivalent Boolean value.

[System.CLSCompliant(false)]
public static bool ToBoolean (sbyte value);

Parameters

value
SByte

The 8-bit signed integer to convert.

Returns

true if value is not zero; otherwise, false.

Attributes

Examples

The following example converts an array of SByte values to Boolean values.

sbyte[] numbers = { SByte.MinValue, -1, 0, 10, 100, SByte.MaxValue };
bool result;

foreach (sbyte number in numbers)
{
   result = Convert.ToBoolean(number);
   Console.WriteLine("{0,-5}  -->  {1}", number, result);
}
// The example displays the following output:
//       -128   -->  True
//       -1     -->  True
//       0      -->  False
//       10     -->  True
//       100    -->  True
//       127    -->  True

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 1.1, 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

ToBoolean(String, IFormatProvider)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Converts the specified string representation of a logical value to its Boolean equivalent, using the specified culture-specific formatting information.

public static bool ToBoolean (string value, IFormatProvider provider);
public static bool ToBoolean (string? value, IFormatProvider? provider);

Parameters

value
String

A string that contains the value of either TrueString or FalseString.

provider
IFormatProvider

An object that supplies culture-specific formatting information. This parameter is ignored.

Returns

true if value equals TrueString, or false if value equals FalseString or null.

Exceptions

value is not equal to TrueString or FalseString.

Remarks

If you prefer not to handle an exception if the conversion fails, you can call the Boolean.TryParse method instead. It returns a Boolean value that indicates whether the conversion succeeded or failed.

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 1.1, 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

ToBoolean(Object, IFormatProvider)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Converts the value of the specified object to an equivalent Boolean value, using the specified culture-specific formatting information.

public static bool ToBoolean (object value, IFormatProvider provider);
public static bool ToBoolean (object? value, IFormatProvider? provider);

Parameters

value
Object

An object that implements the IConvertible interface, or null.

provider
IFormatProvider

An object that supplies culture-specific formatting information.

Returns

true or false, which reflects the value returned by invoking the ToBoolean(IFormatProvider) method for the underlying type of value. If value is null, the method returns false.

Exceptions

value is a string that does not equal TrueString or FalseString.

value does not implement the IConvertible interface.

-or-

The conversion of value to a Boolean is not supported.

Examples

The following example defines a class that implements IConvertible and a class that implements IFormatProvider. Objects of the class that implements IConvertible hold an array of Double values. An object of each class is passed to the ToBoolean(Object, IFormatProvider) method. This method returns true if any of the non-discarded array values are non-zero. The IFormatProvider object determines how elements are discarded for this calculation.

using System;
using System.Collections;

// Define the types of averaging available in the class
// implementing IConvertible.
public enum AverageType : short
{
    None = 0,
    GeometricMean = 1,
    ArithmeticMean = 2,
    Median = 3
};

// Pass an instance of this class to methods that require an
// IFormatProvider. The class instance determines the type of
// average to calculate.
public class AverageInfo : IFormatProvider
{
    protected AverageType AvgType;

    // Specify the type of averaging in the constructor.
    public AverageInfo( AverageType avgType )
    {
        this.AvgType = avgType;
    }

    // This method returns a reference to the containing object
    // if an object of AverageInfo type is requested.
    public object GetFormat( Type argType )
    {
        if ( argType == typeof( AverageInfo ) )
            return this;
        else
            return null;
    }

    // Use this property to set or get the type of averaging.
    public AverageType TypeOfAverage
    {
        get { return this.AvgType; }
        set { this.AvgType = value; }
    }
}

// This class encapsulates an array of double values and implements
// the IConvertible interface. Most of the IConvertible methods
// return an average of the array elements in one of three types:
// arithmetic mean, geometric mean, or median.
public class DataSet : IConvertible
{
    protected ArrayList     data;
    protected AverageInfo   defaultProvider;

    // Construct the object and add an initial list of values.
    // Create a default format provider.
    public DataSet( params double[ ] values )
    {
        data = new ArrayList( values );
        defaultProvider =
            new AverageInfo( AverageType.ArithmeticMean );
    }

    // Add additional values with this method.
    public int Add( double value )
    {
        data.Add( value );
        return data.Count;
    }

    // Get, set, and add values with this indexer property.
    public double this[ int index ]
    {
        get
        {
            if( index >= 0 && index < data.Count )
                return (double)data[ index ];
            else
                throw new InvalidOperationException(
                    "[DataSet.get] Index out of range." );
        }
        set
        {
            if( index >= 0 && index < data.Count )
                data[ index ] = value;

            else if( index == data.Count )
                data.Add( value );
            else
                throw new InvalidOperationException(
                    "[DataSet.set] Index out of range." );
        }
    }

    // This property returns the number of elements in the object.
    public int Count
    {
        get { return data.Count; }
    }

    // This method calculates the average of the object's elements.
    protected double Average( AverageType avgType )
    {
        double  SumProd;

        if( data.Count == 0 )
            return 0.0;

        switch( avgType )
        {
            case AverageType.GeometricMean:

                SumProd = 1.0;
                for( int Index = 0; Index < data.Count; Index++ )
                    SumProd *= (double)data[ Index ];

                // This calculation will not fail with negative
                // elements.
                return Math.Sign( SumProd ) * Math.Pow(
                    Math.Abs( SumProd ), 1.0 / data.Count );

            case AverageType.ArithmeticMean:

                SumProd = 0.0;
                for( int Index = 0; Index < data.Count; Index++ )
                    SumProd += (double)data[ Index ];

                return SumProd / data.Count;

            case AverageType.Median:

                if( data.Count % 2 == 0 )
                    return ( (double)data[ data.Count / 2 ] +
                        (double)data[ data.Count / 2 - 1 ] ) / 2.0;
                else
                    return (double)data[ data.Count / 2 ];

            default:
                return 0.0;
        }
    }

    // Get the AverageInfo object from the caller's format provider,
    // or use the local default.
    protected AverageInfo GetAverageInfo( IFormatProvider provider )
    {
        AverageInfo avgInfo = null;

        if( provider != null )
            avgInfo = (AverageInfo)provider.GetFormat(
                typeof( AverageInfo ) );

        if ( avgInfo == null )
            return defaultProvider;
        else
            return avgInfo;
    }

    // Calculate the average and limit the range.
    protected double CalcNLimitAverage( double min, double max,
        IFormatProvider provider )
    {
        // Get the format provider and calculate the average.
        AverageInfo avgInfo = GetAverageInfo( provider );
        double avg = Average( avgInfo.TypeOfAverage );

        // Limit the range, based on the minimum and maximum values
        // for the type.
        return avg > max ? max : avg < min ? min : avg;
    }

    // The following elements are required by IConvertible.

    // None of these conversion functions throw exceptions. When
    // the data is out of range for the type, the appropriate
    // MinValue or MaxValue is used.
    public TypeCode GetTypeCode( )
    {
        return TypeCode.Object;
    }

    public bool ToBoolean( IFormatProvider provider )
    {
        // ToBoolean is false if the dataset is empty.
        if( data.Count <= 0 )
        {
            return false;
        }

        // For median averaging, ToBoolean is true if any
        // non-discarded elements are nonzero.
        else if( AverageType.Median ==
            GetAverageInfo( provider ).TypeOfAverage )
        {
            if (data.Count % 2 == 0 )
                return ( (double)data[ data.Count / 2 ] != 0.0 ||
                    (double)data[ data.Count / 2 - 1 ] != 0.0 );
            else
                return (double)data[ data.Count / 2 ] != 0.0;
        }

        // For arithmetic or geometric mean averaging, ToBoolean is
        // true if any element of the dataset is nonzero.
        else
        {
            for( int Index = 0; Index < data.Count; Index++ )
                if( (double)data[ Index ] != 0.0 )
                    return true;
            return false;
        }
    }

    public byte ToByte( IFormatProvider provider )
    {
        return Convert.ToByte( CalcNLimitAverage(
            Byte.MinValue, Byte.MaxValue, provider ) );
    }

    public char ToChar( IFormatProvider provider )
    {
        return Convert.ToChar( Convert.ToUInt16( CalcNLimitAverage(
            Char.MinValue, Char.MaxValue, provider ) ) );
    }

    // Convert to DateTime by adding the calculated average as
    // seconds to the current date and time. A valid DateTime is
    // always returned.
    public DateTime ToDateTime( IFormatProvider provider )
    {
        double seconds =
            Average( GetAverageInfo( provider ).TypeOfAverage );
        try
        {
            return DateTime.Now.AddSeconds( seconds );
        }
        catch( ArgumentOutOfRangeException )
        {
            return seconds < 0.0 ? DateTime.MinValue : DateTime.MaxValue;
        }
    }

    public decimal ToDecimal( IFormatProvider provider )
    {
        // The Double conversion rounds Decimal.MinValue and
        // Decimal.MaxValue to invalid Decimal values, so the
        // following limits must be used.
        return Convert.ToDecimal( CalcNLimitAverage(
            -79228162514264330000000000000.0,
            79228162514264330000000000000.0, provider ) );
    }

    public double ToDouble( IFormatProvider provider )
    {
        return Average( GetAverageInfo(provider).TypeOfAverage );
    }

    public short ToInt16( IFormatProvider provider )
    {
        return Convert.ToInt16( CalcNLimitAverage(
            Int16.MinValue, Int16.MaxValue, provider ) );
    }

    public int ToInt32( IFormatProvider provider )
    {
        return Convert.ToInt32( CalcNLimitAverage(
            Int32.MinValue, Int32.MaxValue, provider ) );
    }

    public long ToInt64( IFormatProvider provider )
    {
        // The Double conversion rounds Int64.MinValue and
        // Int64.MaxValue to invalid Int64 values, so the following
        // limits must be used.
        return Convert.ToInt64( CalcNLimitAverage(
            -9223372036854775000, 9223372036854775000, provider ) );
    }

    public SByte ToSByte( IFormatProvider provider )
    {
        return Convert.ToSByte( CalcNLimitAverage(
            SByte.MinValue, SByte.MaxValue, provider ) );
    }

    public float ToSingle( IFormatProvider provider )
    {
        return Convert.ToSingle( CalcNLimitAverage(
            Single.MinValue, Single.MaxValue, provider ) );
    }

    public UInt16 ToUInt16( IFormatProvider provider )
    {
        return Convert.ToUInt16( CalcNLimitAverage(
            UInt16.MinValue, UInt16.MaxValue, provider ) );
    }

    public UInt32 ToUInt32( IFormatProvider provider )
    {
        return Convert.ToUInt32( CalcNLimitAverage(
            UInt32.MinValue, UInt32.MaxValue, provider ) );
    }

    public UInt64 ToUInt64( IFormatProvider provider )
    {
        // The Double conversion rounds UInt64.MaxValue to an invalid
        // UInt64 value, so the following limit must be used.
        return Convert.ToUInt64( CalcNLimitAverage(
            0, 18446744073709550000.0, provider ) );
    }

    public object ToType( Type conversionType,
        IFormatProvider provider )
    {
        return Convert.ChangeType( Average(
            GetAverageInfo( provider ).TypeOfAverage ),
            conversionType );
    }

    public string ToString( IFormatProvider provider )
    {
        AverageType avgType = GetAverageInfo( provider ).TypeOfAverage;
        return String.Format( "( {0}: {1:G10} )", avgType,
            Average( avgType ) );
    }
}

class IConvertibleProviderDemo
{
    // Display a DataSet with three different format providers.
    public static void DisplayDataSet( DataSet ds )
    {
        string      fmt    = "{0,-12}{1,20}{2,20}{3,20}";
        AverageInfo median = new AverageInfo( AverageType.Median );
        AverageInfo geMean =
            new AverageInfo( AverageType.GeometricMean );

         // Display the dataset elements.
        if( ds.Count > 0 )
        {
            Console.Write( "\nDataSet: [{0}", ds[ 0 ] );
            for( int iX = 1; iX < ds.Count; iX++ )
                Console.Write( ", {0}", ds[ iX ] );
            Console.WriteLine( "]\n" );
        }

        Console.WriteLine( fmt, "Convert.", "Default",
            "Geometric Mean", "Median");
        Console.WriteLine( fmt, "--------", "-------",
            "--------------", "------");
        Console.WriteLine( fmt, "ToBoolean",
            Convert.ToBoolean( ds, null ),
            Convert.ToBoolean( ds, geMean ),
            Convert.ToBoolean( ds, median ) );
        Console.WriteLine( fmt, "ToByte",
            Convert.ToByte( ds, null ),
            Convert.ToByte( ds, geMean ),
            Convert.ToByte( ds, median ) );
        Console.WriteLine( fmt, "ToChar",
            Convert.ToChar( ds, null ),
            Convert.ToChar( ds, geMean ),
            Convert.ToChar( ds, median ) );
        Console.WriteLine( "{0,-12}{1,20:yyyy-MM-dd HH:mm:ss}" +
            "{2,20:yyyy-MM-dd HH:mm:ss}{3,20:yyyy-MM-dd HH:mm:ss}",
            "ToDateTime", Convert.ToDateTime( ds, null ),
            Convert.ToDateTime( ds, geMean ),
            Convert.ToDateTime( ds, median ) );
        Console.WriteLine( fmt, "ToDecimal",
            Convert.ToDecimal( ds, null ),
            Convert.ToDecimal( ds, geMean ),
            Convert.ToDecimal( ds, median ) );
        Console.WriteLine( fmt, "ToDouble",
            Convert.ToDouble( ds, null ),
            Convert.ToDouble( ds, geMean ),
            Convert.ToDouble( ds, median ) );
        Console.WriteLine( fmt, "ToInt16",
            Convert.ToInt16( ds, null ),
            Convert.ToInt16( ds, geMean ),
            Convert.ToInt16( ds, median ) );
        Console.WriteLine( fmt, "ToInt32",
            Convert.ToInt32( ds, null ),
            Convert.ToInt32( ds, geMean ),
            Convert.ToInt32( ds, median ) );
        Console.WriteLine( fmt, "ToInt64",
            Convert.ToInt64( ds, null ),
            Convert.ToInt64( ds, geMean ),
            Convert.ToInt64( ds, median ) );
        Console.WriteLine( fmt, "ToSByte",
            Convert.ToSByte( ds, null ),
            Convert.ToSByte( ds, geMean ),
            Convert.ToSByte( ds, median ) );
        Console.WriteLine( fmt, "ToSingle",
            Convert.ToSingle( ds, null ),
            Convert.ToSingle( ds, geMean ),
            Convert.ToSingle( ds, median ) );
        Console.WriteLine( fmt, "ToUInt16",
            Convert.ToUInt16( ds, null ),
            Convert.ToUInt16( ds, geMean ),
            Convert.ToUInt16( ds, median ) );
        Console.WriteLine( fmt, "ToUInt32",
            Convert.ToUInt32( ds, null ),
            Convert.ToUInt32( ds, geMean ),
            Convert.ToUInt32( ds, median ) );
        Console.WriteLine( fmt, "ToUInt64",
            Convert.ToUInt64( ds, null ),
            Convert.ToUInt64( ds, geMean ),
            Convert.ToUInt64( ds, median ) );
    }

    public static void Main( )
    {
        Console.WriteLine( "This example of " +
            "the Convert.To<Type>( object, IFormatProvider ) methods " +
            "\ngenerates the following output. The example " +
            "displays the values \nreturned by the methods, " +
            "using several IFormatProvider objects.\n" );

        DataSet ds1 = new DataSet(
            10.5, 22.2, 45.9, 88.7, 156.05, 297.6 );
        DisplayDataSet( ds1 );

        DataSet ds2 = new DataSet(
            359999.95, 425000, 499999.5, 775000, 1695000 );
        DisplayDataSet( ds2 );
    }
}

/*
This example of the Convert.To<Type>( object, IFormatProvider ) methods
generates the following output. The example displays the values
returned by the methods, using several IFormatProvider objects.

DataSet: [10.5, 22.2, 45.9, 88.7, 156.05, 297.6]

Convert.                 Default      Geometric Mean              Median
--------                 -------      --------------              ------
ToBoolean                   True                True                True
ToByte                       103                  59                  67
ToChar                         g                   ;                   C
ToDateTime   2003-05-13 15:04:12 2003-05-13 15:03:28 2003-05-13 15:03:35
ToDecimal       103.491666666667    59.4332135445164                67.3
ToDouble        103.491666666667    59.4332135445164                67.3
ToInt16                      103                  59                  67
ToInt32                      103                  59                  67
ToInt64                      103                  59                  67
ToSByte                      103                  59                  67
ToSingle                103.4917            59.43321                67.3
ToUInt16                     103                  59                  67
ToUInt32                     103                  59                  67
ToUInt64                     103                  59                  67

DataSet: [359999.95, 425000, 499999.5, 775000, 1695000]

Convert.                 Default      Geometric Mean              Median
--------                 -------      --------------              ------
ToBoolean                   True                True                True
ToByte                       255                 255                 255
ToChar                         ?                   ?                   ?
ToDateTime   2003-05-22 07:39:08 2003-05-20 22:28:45 2003-05-19 09:55:48
ToDecimal              750999.89    631577.237188435            499999.5
ToDouble               750999.89    631577.237188435            499999.5
ToInt16                    32767               32767               32767
ToInt32                   751000              631577              500000
ToInt64                   751000              631577              500000
ToSByte                      127                 127                 127
ToSingle                750999.9            631577.3            499999.5
ToUInt16                   65535               65535               65535
ToUInt32                  751000              631577              500000
ToUInt64                  751000              631577              500000
*/

Remarks

provider enables the user to specify culture-specific conversion information about the contents of value. The base types ignore the provider parameter; however, the parameter may be used if value is a user-defined type that implements the IConvertible interface.

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 1.1, 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

ToBoolean(UInt64)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Important

This API is not CLS-compliant.

Converts the value of the specified 64-bit unsigned integer to an equivalent Boolean value.

[System.CLSCompliant(false)]
public static bool ToBoolean (ulong value);

Parameters

value
UInt64

The 64-bit unsigned integer to convert.

Returns

true if value is not zero; otherwise, false.

Attributes

Examples

The following example converts an array of UInt64 values to Boolean values.

ulong[] numbers = { UInt64.MinValue, 6121, 403890774, UInt64.MaxValue };
bool result;

foreach (ulong number in numbers)
{
   result = Convert.ToBoolean(number);
   Console.WriteLine("{0,-26:N0}  -->  {1}", number, result);
}
// The example displays the following output:
//       0                           -->  False
//       6,121                       -->  True
//       403,890,774                 -->  True
//       18,446,744,073,709,551,615  -->  True

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 1.1, 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

ToBoolean(UInt32)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Important

This API is not CLS-compliant.

Converts the value of the specified 32-bit unsigned integer to an equivalent Boolean value.

[System.CLSCompliant(false)]
public static bool ToBoolean (uint value);

Parameters

value
UInt32

The 32-bit unsigned integer to convert.

Returns

true if value is not zero; otherwise, false.

Attributes

Examples

The following example converts an array of Int32 values to Boolean values.

uint[] numbers = { UInt32.MinValue, 612, 4038907, Int32.MaxValue };
bool result;

foreach (uint number in numbers)
{
   result = Convert.ToBoolean(number);
   Console.WriteLine("{0,-15:N0}  -->  {1}", number, result);
}
// The example displays the following output:
//       0                -->  False
//       612              -->  True
//       4,038,907        -->  True
//       2,147,483,647    -->  True

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 1.1, 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

ToBoolean(UInt16)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Important

This API is not CLS-compliant.

Converts the value of the specified 16-bit unsigned integer to an equivalent Boolean value.

[System.CLSCompliant(false)]
public static bool ToBoolean (ushort value);

Parameters

value
UInt16

The 16-bit unsigned integer to convert.

Returns

true if value is not zero; otherwise, false.

Attributes

Examples

The following example converts an array of UInt16 values to Boolean values.

ushort[] numbers = { UInt16.MinValue, 216, 21453, UInt16.MaxValue };
bool result;

foreach (ushort number in numbers)
{
   result = Convert.ToBoolean(number);
   Console.WriteLine("{0,-7:N0}  -->  {1}", number, result);
}
// The example displays the following output:
//       0        -->  False
//       216      -->  True
//       21,453   -->  True
//       65,535   -->  True

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 1.1, 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

ToBoolean(String)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

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

public static bool ToBoolean (string value);
public static bool ToBoolean (string? value);

Parameters

value
String

A string that contains the value of either TrueString or FalseString.

Returns

true if value equals TrueString, or false if value equals FalseString or null.

Exceptions

value is not equal to TrueString or FalseString.

Examples

The following example uses the Convert.ToBoolean(String) method to convert various strings to Boolean values.

using System;

public class BooleanConversion
{
   public static void Main()
   {
      String[] values = { null, String.Empty, "true", "TrueString",
                          "False", "    false    ", "-1", "0" };
      foreach (var value in values) {
         try
         {
            Console.WriteLine("Converted '{0}' to {1}.", value,
                              Convert.ToBoolean(value));
         }
         catch (FormatException)
         {
            Console.WriteLine("Unable to convert '{0}' to a Boolean.", value);
         }
      }
   }
}
// The example displays the following output:
//       Converted '' to False.
//       Unable to convert '' to a Boolean.
//       Converted 'true' to True.
//       Unable to convert 'TrueString' to a Boolean.
//       Converted 'False' to False.
//       Converted '    false    ' to False.
//       Unable to convert '-1' to a Boolean.
//       Unable to convert '0' to a Boolean.

Remarks

For a successful conversion to occur, the value parameter must equal either Boolean.TrueString, a constant whose value is True, Boolean.FalseString, a constant whose value is False, or it must be null. In comparing value with Boolean.TrueString and Boolean.FalseString, the method ignores case as well as leading and trailing white space.

If you prefer not to handle an exception if the conversion fails, you can call the Boolean.TryParse method instead. It returns a Boolean value that indicates whether the conversion succeeded or failed.

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 1.1, 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

ToBoolean(Single)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Converts the value of the specified single-precision floating-point number to an equivalent Boolean value.

public static bool ToBoolean (float value);

Parameters

value
Single

The single-precision floating-point number to convert.

Returns

true if value is not zero; otherwise, false.

Examples

The following example converts an array of Single values to Boolean values.

float[] numbers = { Single.MinValue, -193.0012f, 20e-15f, 0f,
                    10551e-10f, 100.3398f, Single.MaxValue };
bool result;

foreach (float number in numbers)
{
   result = Convert.ToBoolean(number);
   Console.WriteLine("{0,-15}  -->  {1}", number, result);
}
// The example displays the following output:
//       -3.402823E+38    -->  True
//       -193.0012        -->  True
//       2E-14            -->  True
//       0                -->  False
//       1.0551E-06       -->  True
//       100.3398         -->  True
//       3.402823E+38     -->  True

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 1.1, 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

ToBoolean(Object)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Converts the value of a specified object to an equivalent Boolean value.

public static bool ToBoolean (object value);
public static bool ToBoolean (object? value);

Parameters

value
Object

An object that implements the IConvertible interface, or null.

Returns

true or false, which reflects the value returned by invoking the ToBoolean(IFormatProvider) method for the underlying type of value. If value is null, the method returns false.

Exceptions

value is a string that does not equal TrueString or FalseString.

value does not implement the IConvertible interface.

-or-

The conversion of value to a Boolean is not supported.

Examples

The following example converts an array of object values to Boolean values.

object[] objects = { 16.33, -24, 0, "12", "12.7", String.Empty,
                     "1String", "True", "false", null,
                     new System.Collections.ArrayList() };

foreach (object obj in objects)
{
   Console.Write("{0,-40}  -->  ",
                 obj != null ?
                 String.Format("{0} ({1})", obj, obj.GetType().Name) :
                 "null");
   try {
      Console.WriteLine("{0}", Convert.ToBoolean(obj));
   }
   catch (FormatException) {
      Console.WriteLine("Bad Format");
   }
   catch (InvalidCastException) {
      Console.WriteLine("No Conversion");
   }
}
// The example displays the following output:
//       16.33 (Double)                            -->  True
//       -24 (Int32)                               -->  True
//       0 (Int32)                                 -->  False
//       12 (String)                               -->  Bad Format
//       12.7 (String)                             -->  Bad Format
//        (String)                                 -->  Bad Format
//       1String (String)                          -->  Bad Format
//       True (String)                             -->  True
//       false (String)                            -->  False
//       null                                      -->  False
//       System.Collections.ArrayList (ArrayList)  -->  No Conversion

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 1.1, 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

ToBoolean(DateTime)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Calling this method always throws InvalidCastException.

public static bool ToBoolean (DateTime value);

Parameters

value
DateTime

The date and time value to convert.

Returns

This conversion is not supported. No value is returned.

Exceptions

This conversion is not supported.

Examples

The following example demonstrates that an attempt to convert a DateTime value to a Boolean type throws InvalidCastException.

public void ConvertBoolean() {
    const int year			= 1979;
    const int month			= 7;
    const int day			= 28;
    const int hour			= 13;
    const int minute		= 26;
    const int second		= 15;
    const int millisecond	= 53;

    DateTime dateTime = new DateTime(year, month, day, hour,
                                minute, second, millisecond);
    
    bool boolVal;

    // System.InvalidCastException is always thrown.
    try {
        boolVal = System.Convert.ToBoolean(dateTime);
    }
    catch (System.InvalidCastException) {
        System.Console.WriteLine("Conversion from DateTime to " +
            "Boolean is not supported by the .NET Framework.");
    }
}

Applies to

.NET 9 and other versions
Product Versions
.NET Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9
.NET Framework 1.1, 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 2.0, 2.1

ToBoolean(Int32)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Converts the value of the specified 32-bit signed integer to an equivalent Boolean value.

public static bool ToBoolean (int value);

Parameters

value
Int32

The 32-bit signed integer to convert.

Returns

true if value is not zero; otherwise, false.

Examples

The following example converts an array of Int32 values to Boolean values.

int[] numbers = { Int32.MinValue, -201649, -68, 0, 612, 4038907,
                  Int32.MaxValue };
bool result;

foreach (int number in numbers)
{
   result = Convert.ToBoolean(number);
   Console.WriteLine("{0,-15:N0}  -->  {1}", number, result);
}
// The example displays the following output:
//       -2,147,483,648   -->  True
//       -201,649         -->  True
//       -68              -->  True
//       0                -->  False
//       612              -->  True
//       4,038,907        -->  True
//       2,147,483,647    -->  True

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 1.1, 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

ToBoolean(Int16)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Converts the value of the specified 16-bit signed integer to an equivalent Boolean value.

public static bool ToBoolean (short value);

Parameters

value
Int16

The 16-bit signed integer to convert.

Returns

true if value is not zero; otherwise, false.

Examples

The following example converts an array of Int16 values to Boolean values.

short[] numbers = { Int16.MinValue, -10000, -154, 0, 216, 21453,
                    Int16.MaxValue };
bool result;

foreach (short number in numbers)
{
   result = Convert.ToBoolean(number);
   Console.WriteLine("{0,-7:N0}  -->  {1}", number, result);
}
// The example displays the following output:
//       -32,768  -->  True
//       -10,000  -->  True
//       -154     -->  True
//       0        -->  False
//       216      -->  True
//       21,453   -->  True
//       32,767   -->  True

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 1.1, 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

ToBoolean(Double)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Converts the value of the specified double-precision floating-point number to an equivalent Boolean value.

public static bool ToBoolean (double value);

Parameters

value
Double

The double-precision floating-point number to convert.

Returns

true if value is not zero; otherwise, false.

Examples

The following example converts a Boolean to a Double and a Double to a Boolean value.

public void ConvertDoubleBool(double doubleVal) {
    bool	boolVal;
    // Double to bool conversion cannot overflow.
    boolVal = System.Convert.ToBoolean(doubleVal);
    System.Console.WriteLine("{0} as a Boolean is: {1}.",
        doubleVal, boolVal);

    // bool to double conversion cannot overflow.
    doubleVal = System.Convert.ToDouble(boolVal);
    System.Console.WriteLine("{0} as a double is: {1}.",
        boolVal, doubleVal);
}

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 1.1, 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

ToBoolean(Decimal)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Converts the value of the specified decimal number to an equivalent Boolean value.

public static bool ToBoolean (decimal value);

Parameters

value
Decimal

The number to convert.

Returns

true if value is not zero; otherwise, false.

Examples

The following example converts an array of Decimal values to Boolean values.

decimal[] numbers = { Decimal.MinValue, -12034.87m, -100m, 0m,
                             300m, 6790823.45m, Decimal.MaxValue };
bool result;

foreach (decimal number in numbers)
{
   result = Convert.ToBoolean(number);
   Console.WriteLine("{0,-30}  -->  {1}", number, result);
}
// The example displays the following output:
//       -79228162514264337593543950335  -->  True
//       -12034.87                       -->  True
//       -100                            -->  True
//       0                               -->  False
//       300                             -->  True
//       6790823.45                      -->  True
//       79228162514264337593543950335   -->  True

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 1.1, 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

ToBoolean(Char)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Calling this method always throws InvalidCastException.

public static bool ToBoolean (char value);

Parameters

value
Char

The Unicode character to convert.

Returns

This conversion is not supported. No value is returned.

Exceptions

This conversion is not supported.

See also

Applies to

.NET 9 and other versions
Product Versions
.NET Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9
.NET Framework 1.1, 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 2.0, 2.1

ToBoolean(Byte)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Converts the value of the specified 8-bit unsigned integer to an equivalent Boolean value.

public static bool ToBoolean (byte value);

Parameters

value
Byte

The 8-bit unsigned integer to convert.

Returns

true if value is not zero; otherwise, false.

Examples

The following example converts an array of Byte values to Boolean values.

byte[] bytes = { Byte.MinValue, 100, 200, Byte.MaxValue };
bool result;

foreach (byte byteValue in bytes)
{
   result = Convert.ToBoolean(byteValue);
   Console.WriteLine("{0,-5}  -->  {1}", byteValue, result);
}
// The example displays the following output:
//       0      -->  False
//       100    -->  True
//       200    -->  True
//       255    -->  True

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 1.1, 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

ToBoolean(Boolean)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Returns the specified Boolean value; no actual conversion is performed.

public static bool ToBoolean (bool value);

Parameters

value
Boolean

The Boolean value to return.

Returns

value is returned unchanged.

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 1.1, 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

ToBoolean(Int64)

Source:
Convert.cs
Source:
Convert.cs
Source:
Convert.cs

Converts the value of the specified 64-bit signed integer to an equivalent Boolean value.

public static bool ToBoolean (long value);

Parameters

value
Int64

The 64-bit signed integer to convert.

Returns

true if value is not zero; otherwise, false.

Examples

The following example converts an array of Int64 values to Boolean values.

long[] numbers = { Int64.MinValue, -2016493, -689, 0, 6121,
                   403890774, Int64.MaxValue };
bool result;

foreach (long number in numbers)
{
   result = Convert.ToBoolean(number);
   Console.WriteLine("{0,-26:N0}  -->  {1}", number, result);
}
// The example displays the following output:
//       -9,223,372,036,854,775,808  -->  True
//       -2,016,493                  -->  True
//       -689                        -->  True
//       0                           -->  False
//       6,121                       -->  True
//       403,890,774                 -->  True
//       9,223,372,036,854,775,807   -->  True

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 1.1, 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