OverflowException Class

Definition

public ref class OverflowException : ArithmeticException

public class OverflowException : ArithmeticException

[System.Serializable]public class OverflowException : ArithmeticException

[System.Serializable][System.Runtime.InteropServices.ComVisible(true)]public class OverflowException : ArithmeticException

type OverflowException = class    inherit ArithmeticException

[<System.Serializable>]type OverflowException = class    inherit ArithmeticException

[<System.Serializable>][<System.Runtime.InteropServices.ComVisible(true)>]type OverflowException = class    inherit ArithmeticException

Public Class OverflowExceptionInherits ArithmeticException

Inheritance

Object

Exception

ArithmeticException

OverflowException

Inheritance

Object

Exception

SystemException

ArithmeticException

OverflowException

Attributes

SerializableAttributeComVisibleAttribute

Remarks

AnOverflowException is thrown at run time under the following conditions:

• An arithmetic operation produces a result that is outside the range of the data type returned by the operation. The following example illustrates theOverflowException that is thrown by a multiplication operation that overflows the bounds of theInt32 type.

  int value = 780000000;checked {try {   // Square the original value.   int square = value * value;   Console.WriteLine("{0} ^ 2 = {1}", value, square);}catch (OverflowException) {   double square = Math.Pow(value, 2);   Console.WriteLine("Exception: {0} > {1:E}.",                     square, Int32.MaxValue);} }// The example displays the following output://       Exception: 6.084E+17 > 2.147484E+009.

  open Checkedlet v = 780000000try   // Square the original value.   let square = v * v   printfn $"{v} ^ 2 = {square}"with :? OverflowException ->    let square = float v ** 2    printfn $"Exception: {square} > {Int32.MaxValue:E}."// The example displays the following output://       Exception: 6.084E+17 > 2.147484E+009.

  Dim value As Integer = 780000000Try   ' Square the original value.   Dim square As Integer = value * value    Console.WriteLine("{0} ^ 2 = {1}", value, square)Catch e As OverflowException   Dim square As Double = Math.Pow(value, 2)   Console.WriteLine("Exception: {0} > {1:E}.", _                     square, Int32.MaxValue)End Try' The example displays the following output:'       Exception: 6.084E+17 > 2.147484E+009.

• A casting or conversion operation attempts to perform a narrowing conversion, and the value of the source data type is outside the range of the target data type. The following example illustrates theOverflowException that is thrown by the attempt to convert a large unsigned byte value to a signed byte value.

  byte value = 241;checked {try {   sbyte newValue = (sbyte) value;   Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",                     value.GetType().Name, value,                     newValue.GetType().Name, newValue);}catch (OverflowException) {   Console.WriteLine("Exception: {0} > {1}.", value, SByte.MaxValue);} }// The example displays the following output://       Exception: 241 > 127.

  open Checkedlet value = 241uytry    let newValue = int8 value    printfn $"Converted the {value.GetType().Name} value {value} to the {newValue.GetType().Name} value {newValue}."with :? OverflowException ->    printfn $"Exception: {value} > {SByte.MaxValue}."// The example displays the following output://       Exception: 241 > 127.

  Dim value As Byte = 241Try   Dim newValue As SByte = (CSByte(value))   Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _                     value.GetType().Name, value, _                     newValue.GetType().Name, newValue)Catch e As OverflowException   Console.WriteLine("Exception: {0} > {1}.", value, SByte.MaxValue)End Try                            ' The example displays the following output:'       Exception: 241 > 127.

In each case, the result of the operation is a value that is less than theMinValue property or greater than theMaxValue property of the data type that results from the operation.

For the arithmetic, casting, or conversion operation to throw anOverflowException, the operation must occur in a checked context. By default, arithmetic operations and overflows in Visual Basic are checked; in C# and F#, they are not. If the operation occurs in an unchecked context, the result is truncated by discarding any high-order bits that do not fit into the destination type. The following example illustrates such an unchecked conversion in C# or F#. It repeats the previous example in an unchecked context.

byte value = 241;try {   sbyte newValue = (sbyte) value;   Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",                     value.GetType().Name, value,                     newValue.GetType().Name, newValue);}catch (OverflowException) {   Console.WriteLine("Exception: {0} > {1}.", value, SByte.MaxValue);}// The example displays the following output://       Converted the Byte value 241 to the SByte value -15.

let value = 241uytry    let newValue = int8 value    printfn $"Converted the {value.GetType().Name} value {value} to the {newValue.GetType().Name} value {newValue}."with :? OverflowException ->    printfn $"Exception: {value} > {SByte.MaxValue}."// The example displays the following output://       Converted the Byte value 241 to the SByte value -15.

The following Microsoft intermediate language (MSIL) instructions throw anOverflowException:

• add.ovf.<signed>

• conv.ovf.<to type>

• conv.ovf.<to type>.un

• mul.ovf.<type>

• sub.ovf.<type>

• newarr

OverflowException uses the HRESULT COR_E_OVERFLOW, which has the value 0x80131516.

For a list of initial property values for an instance ofOverflowException, see theOverflowException constructors.

See also

• Exception
• Handling and Throwing Exceptions