OverflowException Class
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OverflowException Class

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

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

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

public class OverflowException : ArithmeticException

The OverflowException type exposes the following members.

  NameDescription
Public methodOverflowException()Initializes a new instance of the OverflowException class.
Public methodOverflowException(String)Initializes a new instance of the OverflowException class with a specified error message.
Public methodOverflowException(String, Exception)Initializes a new instance of the OverflowException class with a specified error message and a reference to the inner exception that is the cause of this exception.
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  NameDescription
Public propertyDataGets a collection of key/value pairs that provide additional user-defined information about the exception. (Inherited from Exception.)
Public propertyHelpLinkGets or sets a link to the help file associated with this exception. (Inherited from Exception.)
Public propertyHResultGets or sets HRESULT, a coded numerical value that is assigned to a specific exception. (Inherited from Exception.)
Public propertyInnerExceptionGets the Exception instance that caused the current exception. (Inherited from Exception.)
Public propertyMessageGets a message that describes the current exception. (Inherited from Exception.)
Public propertySourceGets or sets the name of the application or the object that causes the error. (Inherited from Exception.)
Public propertyStackTraceGets a string representation of the frames on the call stack at the time the current exception was thrown. (Inherited from Exception.)
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  NameDescription
Public methodEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetBaseExceptionWhen overridden in a derived class, returns the Exception that is the root cause of one or more subsequent exceptions. (Inherited from Exception.)
Public methodGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodGetTypeGets the runtime type of the current instance. (Inherited from Exception.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodToStringCreates and returns a string representation of the current exception. (Inherited from Exception.)
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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; 
       outputBlock.Text += String.Format("{0} ^ 3 = {1}", value, square) + Environment.NewLine;
    }
    catch (OverflowException) {
       double square = Math.Pow(value, 2);
       outputBlock.Text += String.Format("Exception: {0} > {1:E}.", 
                         square, Int32.MaxValue) + Environment.NewLine;
    } }
    // 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;
       outputBlock.Text += String.Format("Converted the {0} value {1} to the {2} value {3}.", 
                         value.GetType().Name, value, 
                         newValue.GetType().Name, newValue) + Environment.NewLine;
    }
    catch (OverflowException) {
       outputBlock.Text += String.Format("Exception: {0} > {1}.", value, SByte.MaxValue) + Environment.NewLine;
    } }                            
    // 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#, 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#. It repeats the previous example in an unchecked context.


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


In languages that detect overflow, OverflowException is the exception that gets thrown. For example, in C#, the checked keyword is used to detect overflow conditions. An OverflowException exception occurs only in a checked context.

The following Microsoft intermediate language (MSIL) instructions throw 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, that has the value 0x80131516.

For a list of initial property values for an instance of OverflowException, see the OverflowException constructors.

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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