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OverflowException Class (System) | Microsoft Learn

The exception that is thrown when an arithmetic, casting, or conversion operation in a checked context results in an overflow.

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 OverflowException
Inherits ArithmeticException

Inheritance

Inheritance

Attributes

An OverflowException 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 the OverflowException that is thrown by a multiplication operation that overflows the bounds of the Int32 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 Checked
  
  let v = 780000000
  try
     // 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 = 780000000
  Try
     ' 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 the OverflowException 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 Checked
  
  let value = 241uy
  try
      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 = 241
  Try
     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 the MinValue property or greater than the MaxValue property of the data type that results from the operation.

For the arithmetic, casting, or conversion operation to throw an OverflowException, 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 = 241uy
try
    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 an OverflowException:

• 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 of OverflowException, see the OverflowException constructors.

Gets a collection of key/value pairs that provide additional user-defined information about the exception.

Gets or sets a link to the help file associated with this exception.

Gets or sets HRESULT, a coded numerical value that is assigned to a specific exception.

Gets the Exception instance that caused the current exception.

Gets a message that describes the current exception.

Gets or sets the name of the application or the object that causes the error.

Gets a string representation of the immediate frames on the call stack.

Gets the method that throws the current exception.

Obsolete.

Occurs when an exception is serialized to create an exception state object that contains serialized data about the exception.

• Exception
• Handling and Throwing Exceptions

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