Articolo
11/18/2011

Convert.ToInt32 Method (Double)

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

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)

Syntax

'Declaration
Public Shared Function ToInt32 ( _
    value As Double _
) As Integer

public static int ToInt32(
    double value
)

Parameters

value
Type: System.Double
A double-precision floating point number.

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.

Exceptions

Exception	Condition
OverflowException	value is greater than Int32.MaxValue or less than Int32.MinValue.

Examples

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.
   Try
      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.
   try
   {
      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

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.

Condividi tramite