Artigo
11/18/2011

InvalidCastException Class

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

The exception that is thrown for invalid casting or explicit conversion.

Inheritance Hierarchy

System.Object
  System.Exception
    System.SystemException
      System.InvalidCastException

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

Syntax

'Declaration
<ComVisibleAttribute(True)> _
Public Class InvalidCastException _
    Inherits SystemException

[ComVisibleAttribute(true)]
public class InvalidCastException : SystemException

The InvalidCastException type exposes the following members.

Constructors

	Name	Description
	InvalidCastException()	Initializes a new instance of the InvalidCastException class.
	InvalidCastException(String)	Initializes a new instance of the InvalidCastException class with a specified error message.
	InvalidCastException(String, Exception)	Initializes a new instance of the InvalidCastException class with a specified error message and a reference to the inner exception that is the cause of this exception.

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Properties

	Name	Description
	Data	Gets a collection of key/value pairs that provide additional user-defined information about the exception. (Inherited from Exception.)
	HResult	Gets or sets HRESULT, a coded numerical value that is assigned to a specific exception. (Inherited from Exception.)
	InnerException	Gets the Exception instance that caused the current exception. (Inherited from Exception.)
	Message	Gets a message that describes the current exception. (Inherited from Exception.)
	StackTrace	Gets 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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Methods

	Name	Description
	Equals(Object)	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
	GetBaseException	When overridden in a derived class, returns the Exception that is the root cause of one or more subsequent exceptions. (Inherited from Exception.)
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetType	Gets the runtime type of the current instance. (Inherited from Exception.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	ToString	Creates and returns a string representation of the current exception. (Inherited from Exception.)

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Remarks

InvalidCastException is thrown if:

For a conversion from a Single or a Double to a Decimal, the source value is infinity, Not-a-Number (NaN), or too large to be represented as the destination type.
A failure occurs during an explicit reference conversion.

For an explicit reference conversion to be successful, the source value must be nulla null reference (Nothing in Visual Basic), or the object type referenced by the source argument must be convertible to the destination type by an implicit reference conversion.

For information on conversions supported by the system, see the Convert class. For errors that occur when the destination type can store source type values, but is not large enough to store a specific source value, see OverflowException exception.

The following Microsoft intermediate language (MSIL) instructions throw InvalidCastException

castclass
refanyval
unbox

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

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.

Thread Safety

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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