Статья
11/18/2011

Convert.ToByte Method (Single)

Microsoft Silverlight will reach end of support after October 2021. Learn more.

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

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

Syntax

'Declaration
Public Shared Function ToByte ( _
    value As Single _
) As Byte

public static byte ToByte(
    float value
)

Parameters

value
Type: System.Single
A single-precision floating point number.

Return Value

Type: System.Byte
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.

Exceptions

Exception	Condition
OverflowException	value is greater than Byte.MaxValue or less than Byte.MinValue.

Examples

The following code sample illustrates the use of ToByte, converting a Single (float) value to a Byte :

Public Sub ConvertByteSingle(ByVal byteVal As Byte)
   Dim singleVal As Single

   ' Byte to float conversion will not overflow.
   singleVal = System.Convert.ToSingle(byteVal)
   outputBlock.Text &= String.Format("The byte as a single is {0}.", _
                             singleVal) & vbCrLf

   ' Single to byte conversion can overflow.
   Try
      byteVal = System.Convert.ToByte(singleVal)
      outputBlock.Text &= String.Format("The single as a byte is {0}.", _
                                byteVal) & vbCrLf
   Catch exception As System.OverflowException
      outputBlock.Text &= String.Format( _
          "Overflow in single-to-byte conversion.") & vbCrLf
   End Try
End Sub

public void ConvertByteSingle(byte byteVal)
{
   float floatVal;

   // Byte to float conversion will not overflow.
   floatVal = System.Convert.ToSingle(byteVal);
   outputBlock.Text += String.Format("The byte as a float is {0}.",
      floatVal) + "\n";

   // Float to byte conversion can overflow.
   try
   {
      byteVal = System.Convert.ToByte(floatVal);
      outputBlock.Text += String.Format("The float as a byte is {0}.",
         byteVal) + "\n";
   }
   catch (System.OverflowException)
   {
      outputBlock.Text += String.Format(
         "The float value is too large for a byte.") + "\n";
   }
}

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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