BitConverter.ToSingle Method
Microsoft Silverlight will reach end of support after October 2021. Learn more.
Returns a single-precision floating point number converted from four bytes at a specified position in a byte array.
Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
<SecuritySafeCriticalAttribute> _
Public Shared Function ToSingle ( _
value As Byte(), _
startIndex As Integer _
) As Single
[SecuritySafeCriticalAttribute]
public static float ToSingle(
byte[] value,
int startIndex
)
Parameters
- value
Type: array<System.Byte[]
An array of bytes.
- startIndex
Type: System.Int32
The starting position within value.
Return Value
Type: System.Single
A single-precision floating point number formed by four bytes beginning at startIndex.
Exceptions
| Exception | Condition |
|---|---|
| ArgumentException | startIndex is greater than or equal to the length of value minus 3, and is less than or equal to the length of value minus 1. |
| ArgumentNullException | value is nulla null reference (Nothing in Visual Basic). |
| ArgumentOutOfRangeException | startIndex is less than zero or greater than the length of value minus 1. |
Examples
The following code example converts elements of Byte arrays to Single values with the ToSingle method.
' Example of the BitConverter.ToSingle method.
Module Example
Const formatter As String = "{0,5}{1,17}{2,18:E7}"
' Convert four Byte array elements to a Single and display it.
Sub BAToSingle(ByVal outputBlock As System.Windows.Controls.TextBlock, ByVal bytes() As Byte, ByVal index As Integer)
Dim value As Single = BitConverter.ToSingle(bytes, index)
outputBlock.Text &= String.Format(formatter, index, _
BitConverter.ToString(bytes, index, 4), value) & vbCrLf
End Sub
' Display a Byte array, using multiple lines if necessary.
Sub WriteMultiLineByteArray(ByVal outputBlock As System.Windows.Controls.TextBlock, ByVal bytes() As Byte)
Const rowSize As Integer = 20
Dim iter As Integer
outputBlock.Text &= "initial Byte array" & vbCrLf
outputBlock.Text &= "------------------" & vbCrLf
For iter = 0 To bytes.Length - rowSize - 1 Step rowSize
outputBlock.Text &= String.Format( _
BitConverter.ToString(bytes, iter, rowSize))
outputBlock.Text &= "-" & vbCrLf
Next iter
outputBlock.Text &= String.Format(BitConverter.ToString(bytes, iter)) & vbCrLf
outputBlock.Text &= vbCrLf
End Sub
Public Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
Dim byteArray As Byte() = { _
0, 0, 0, 0, 128, 63, 0, 0, 112, 65, _
0, 255, 127, 71, 0, 0, 128, 59, 0, 0, _
128, 47, 73, 70, 131, 5, 75, 6, 158, 63, _
77, 6, 158, 63, 80, 6, 158, 63, 30, 55, _
190, 121, 255, 255, 127, 255, 255, 127, 127, 1, _
0, 0, 0, 192, 255, 0, 0, 128, 255, 0, _
0, 128, 127}
outputBlock.Text &= String.Format( _
"This example of the BitConverter.ToSingle( Byte( ), " & _
"Integer ) " & vbCrLf & "method generates the " & _
"following output. It converts elements " & vbCrLf & _
"of a Byte array to Single values." & vbCrLf) & vbCrLf
WriteMultiLineByteArray(outputBlock, byteArray)
outputBlock.Text &= String.Format(formatter, "index", "array elements", _
"Single") & vbCrLf
outputBlock.Text &= String.Format(formatter, "-----", "--------------", _
"------") & vbCrLf
' Convert Byte array elements to Single values.
BAToSingle(outputBlock, byteArray, 0)
BAToSingle(outputBlock, byteArray, 2)
BAToSingle(outputBlock, byteArray, 6)
BAToSingle(outputBlock, byteArray, 10)
BAToSingle(outputBlock, byteArray, 14)
BAToSingle(outputBlock, byteArray, 18)
BAToSingle(outputBlock, byteArray, 22)
BAToSingle(outputBlock, byteArray, 26)
BAToSingle(outputBlock, byteArray, 30)
BAToSingle(outputBlock, byteArray, 34)
BAToSingle(outputBlock, byteArray, 38)
BAToSingle(outputBlock, byteArray, 42)
BAToSingle(outputBlock, byteArray, 45)
BAToSingle(outputBlock, byteArray, 49)
BAToSingle(outputBlock, byteArray, 51)
BAToSingle(outputBlock, byteArray, 55)
BAToSingle(outputBlock, byteArray, 59)
End Sub
End Module
' This example of the BitConverter.ToSingle( Byte( ), Integer )
' method generates the following output. It converts elements
' of a Byte array to Single values.
'
' initial Byte array
' ------------------
' 00-00-00-00-80-3F-00-00-70-41-00-FF-7F-47-00-00-80-3B-00-00-
' 80-2F-49-46-83-05-4B-06-9E-3F-4D-06-9E-3F-50-06-9E-3F-1E-37-
' BE-79-FF-FF-7F-FF-FF-7F-7F-01-00-00-00-C0-FF-00-00-80-FF-00-
' 00-80-7F
'
' index array elements Single
' ----- -------------- ------
' 0 00-00-00-00 0.0000000E+000
' 2 00-00-80-3F 1.0000000E+000
' 6 00-00-70-41 1.5000000E+001
' 10 00-FF-7F-47 6.5535000E+004
' 14 00-00-80-3B 3.9062500E-003
' 18 00-00-80-2F 2.3283064E-010
' 22 49-46-83-05 1.2345000E-035
' 26 4B-06-9E-3F 1.2345671E+000
' 30 4D-06-9E-3F 1.2345673E+000
' 34 50-06-9E-3F 1.2345676E+000
' 38 1E-37-BE-79 1.2345679E+035
' 42 FF-FF-7F-FF -3.4028235E+038
' 45 FF-FF-7F-7F 3.4028235E+038
' 49 01-00-00-00 1.4012985E-045
' 51 00-00-C0-FF NaN
' 55 00-00-80-FF -Infinity
' 59 00-00-80-7F Infinity
// Example of the BitConverter.ToSingle method.
using System;
class Example
{
const string formatter = "{0,5}{1,17}{2,18:E7}";
// Convert four byte array elements to a float and display it.
public static void BAToSingle(System.Windows.Controls.TextBlock outputBlock, byte[] bytes, int index)
{
float value = BitConverter.ToSingle(bytes, index);
outputBlock.Text += String.Format(formatter, index,
BitConverter.ToString(bytes, index, 4), value) + "\n";
}
// Display a byte array, using multiple lines if necessary.
public static void WriteMultiLineByteArray(System.Windows.Controls.TextBlock outputBlock, byte[] bytes)
{
const int rowSize = 20;
int iter;
outputBlock.Text += "initial byte array" + "\n";
outputBlock.Text += "------------------" + "\n";
for (iter = 0; iter < bytes.Length - rowSize; iter += rowSize)
{
outputBlock.Text += String.Format(
BitConverter.ToString(bytes, iter, rowSize));
outputBlock.Text += "-" + "\n";
}
outputBlock.Text += String.Format(BitConverter.ToString(bytes, iter)) + "\n";
outputBlock.Text += "\n";
}
public static void Demo(System.Windows.Controls.TextBlock outputBlock)
{
byte[] byteArray = {
0, 0, 0, 0, 128, 63, 0, 0, 112, 65,
0, 255, 127, 71, 0, 0, 128, 59, 0, 0,
128, 47, 73, 70, 131, 5, 75, 6, 158, 63,
77, 6, 158, 63, 80, 6, 158, 63, 30, 55,
190, 121, 255, 255, 127, 255, 255, 127, 127, 1,
0, 0, 0, 192, 255, 0, 0, 128, 255, 0,
0, 128, 127 };
outputBlock.Text += String.Format(
"This example of the BitConverter.ToSingle( byte( ), " +
"int ) \nmethod generates the following output. It " +
"converts elements \nof a byte array to float values.\n") + "\n";
WriteMultiLineByteArray(outputBlock, byteArray);
outputBlock.Text += String.Format(formatter, "index", "array elements",
"float") + "\n";
outputBlock.Text += String.Format(formatter, "-----", "--------------",
"-----") + "\n";
// Convert byte array elements to float values.
BAToSingle(outputBlock, byteArray, 0);
BAToSingle(outputBlock, byteArray, 2);
BAToSingle(outputBlock, byteArray, 6);
BAToSingle(outputBlock, byteArray, 10);
BAToSingle(outputBlock, byteArray, 14);
BAToSingle(outputBlock, byteArray, 18);
BAToSingle(outputBlock, byteArray, 22);
BAToSingle(outputBlock, byteArray, 26);
BAToSingle(outputBlock, byteArray, 30);
BAToSingle(outputBlock, byteArray, 34);
BAToSingle(outputBlock, byteArray, 38);
BAToSingle(outputBlock, byteArray, 42);
BAToSingle(outputBlock, byteArray, 45);
BAToSingle(outputBlock, byteArray, 49);
BAToSingle(outputBlock, byteArray, 51);
BAToSingle(outputBlock, byteArray, 55);
BAToSingle(outputBlock, byteArray, 59);
}
}
/*
This example of the BitConverter.ToSingle( byte( ), int )
method generates the following output. It converts elements
of a byte array to float values.
initial byte array
------------------
00-00-00-00-80-3F-00-00-70-41-00-FF-7F-47-00-00-80-3B-00-00-
80-2F-49-46-83-05-4B-06-9E-3F-4D-06-9E-3F-50-06-9E-3F-1E-37-
BE-79-FF-FF-7F-FF-FF-7F-7F-01-00-00-00-C0-FF-00-00-80-FF-00-
00-80-7F
index array elements float
----- -------------- -----
0 00-00-00-00 0.0000000E+000
2 00-00-80-3F 1.0000000E+000
6 00-00-70-41 1.5000000E+001
10 00-FF-7F-47 6.5535000E+004
14 00-00-80-3B 3.9062500E-003
18 00-00-80-2F 2.3283064E-010
22 49-46-83-05 1.2345000E-035
26 4B-06-9E-3F 1.2345671E+000
30 4D-06-9E-3F 1.2345673E+000
34 50-06-9E-3F 1.2345676E+000
38 1E-37-BE-79 1.2345679E+035
42 FF-FF-7F-FF -3.4028235E+038
45 FF-FF-7F-7F 3.4028235E+038
49 01-00-00-00 1.4012985E-045
51 00-00-C0-FF NaN
55 00-00-80-FF -Infinity
59 00-00-80-7F Infinity
*/
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.