Convert.ToInt32 Method (Double)

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Converts the value of the specified double-precision floating point number to an equivalent 32-bit signed integer.

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


Public Shared Function ToInt32 ( _
    value As Double _
) As Integer
public static int ToInt32(
    double value


Return Value

Type: System..::.Int32
value rounded to the nearest 32-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.


Exception Condition

value is greater than Int32..::.MaxValue or less than Int32..::.MinValue.


The following code sample illustrates the conversion of a Double value to an Int32, using ToInt32.

Public Sub ConvertDoubleInt(ByVal doubleVal As Double)

   Dim intVal As Integer = 0
   ' Double to Integer conversion can overflow.
      intVal = System.Convert.ToInt32(doubleVal)
      outputBlock.Text &= String.Format("{0} as an Integer is: {1}", _
                                doubleVal, intVal) & vbCrLf
   Catch exception As System.OverflowException
      outputBlock.Text &= String.Format( _
          "Overflow in Double-to-Byte conversion.") & vbCrLf
   End Try

   ' Integer to Double conversion cannot overflow.
   doubleVal = System.Convert.ToDouble(intVal)
   outputBlock.Text &= String.Format("{0} as a Double is: {1}", _
                             intVal, doubleVal) & vbCrLf
End Sub
public void ConvertDoubleInt(double doubleVal)

   int intVal = 0;
   // Double to int conversion can overflow.
      intVal = System.Convert.ToInt32(doubleVal);
      outputBlock.Text += String.Format("{0} as an int is: {1}",
         doubleVal, intVal) + "\n";
   catch (System.OverflowException)
      outputBlock.Text += String.Format(
         "Overflow in double-to-int conversion.") + "\n";

   // Int to double conversion cannot overflow.
   doubleVal = System.Convert.ToDouble(intVal);
   outputBlock.Text += String.Format("{0} as a double is: {1}",
      intVal, doubleVal) + "\n";

Version Information

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0


Windows Phone

See Also


Convert Class

ToInt32 Overload

System Namespace