Double.IsNaN Method
Microsoft Silverlight will reach end of support after October 2021. Learn more.
Returns a value indicating whether the specified number evaluates to a value that is not a number (NaN).
Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
<SecuritySafeCriticalAttribute> _
Public Shared Function IsNaN ( _
d As Double _
) As Boolean
[SecuritySafeCriticalAttribute]
public static bool IsNaN(
double d
)
Parameters
- d
Type: System.Double
A double-precision floating-point number.
Return Value
Type: System.Boolean
true if d evaluates to NaN; otherwise, false.
Remarks
Floating-point operations return NaN to signal that that result of the operation is undefined. For example, dividing 0.0 by 0.0 results in NaN.
Examples
The following example illustrates the use of IsNaN:
' This will return true.
If Double.IsNaN(0 / zero) Then
outputBlock.Text &= "Double.IsNan() can determine whether a value is not-a-number." & vbCrLf
End If
// This will return true.
if (Double.IsNaN(0 / zero))
{
outputBlock.Text += "Double.IsNan() can determine whether a value is not-a-number." + "\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.