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Convert.ToSByte Method (Double)

Converts the value of the specified double-precision floating-point number to an equivalent 8-bit signed integer.

This API is not CLS-compliant. 

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

public static sbyte ToSByte(
	double value


Type: System.Double

The double-precision floating-point number to convert.

Return Value

Type: System.SByte
value, rounded to the nearest 8-bit signed integer. If value is halfway between two whole numbers, the even number is returned; that is, 4.5 is converted to 4, and 5.5 is converted to 6.


value is greater than SByte.MaxValue or less than SByte.MinValue.

The following example attempts to convert each element in an array of Double values to a signed byte.

double[] numbers = { Double.MinValue, -129.5, -12.7, 0, 16,
                     103.6, 255.0, 1.63509e17, Double.MaxValue};
sbyte result;

foreach (double number in numbers)
   try {
      result = Convert.ToSByte(number);
      Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
                        number.GetType().Name, number,
                        result.GetType().Name, result);
   catch (OverflowException) {
      Console.WriteLine("The {0} value {1} is outside the range of the SByte type.",
                        number.GetType().Name, number);
// The example displays the following output: 
//    The Double value -1.79769313486232E+308 is outside the range of the SByte type. 
//    The Double value -129.5 is outside the range of the SByte type. 
//    Converted the Double value -12.7 to the SByte value -13. 
//    Converted the Double value 0 to the SByte value 0. 
//    Converted the Double value 16 to the SByte value 16. 
//    Converted the Double value 103.6 to the SByte value 104. 
//    The Double value 255 is outside the range of the SByte type. 
//    The Double value 1.63509E+17 is outside the range of the SByte type. 
//    The Double value 1.79769313486232E+308 is outside the range of the SByte type.

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, 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.

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