ArgumentException Class

July 28, 2014

The exception that is thrown when one of the arguments provided to a method is not valid.

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

'Declaration
Public Class ArgumentException _
	Inherits SystemException

The ArgumentException type exposes the following members.

  NameDescription
Public methodArgumentExceptionInitializes a new instance of the ArgumentException class.
Public methodArgumentException(String)Initializes a new instance of the ArgumentException class with a specified error message.
Public methodArgumentException(String, Exception)Initializes a new instance of the ArgumentException class with a specified error message and a reference to the inner exception that is the cause of this exception.
Public methodArgumentException(String, String)Initializes a new instance of the ArgumentException class with a specified error message and the name of the parameter that causes this exception.
Public methodArgumentException(String, String, Exception)Initializes a new instance of the ArgumentException class with a specified error message, the parameter name, 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 the error message and the parameter name, or only the error message if no parameter name is set. (Overrides Exception.Message.)
Public propertyParamNameGets the name of the parameter that causes this 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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ArgumentException is thrown when a method is invoked and at least one of the passed arguments does not meet the parameter specification of the called method. All instances of ArgumentException should carry a meaningful error message describing the invalid argument, as well as the expected range of values for the argument.

The primary derived classes of ArgumentException are ArgumentNullException and ArgumentOutOfRangeException. These derived classes should be used instead of ArgumentException, except in situations where neither of the derived classes is acceptable. For example, exceptions should be thrown by:

  • ArgumentNullException whenever Nothing is passed to a method that does not accept it as a valid argument.

  • ArgumentOutOfRangeException when the value of an argument is outside the range of acceptable values; for example, when the value "46" is passed as the month argument during the creation of a DateTime.

If the method call does not have any argument or if the failure does not involve the arguments themselves, then InvalidOperationException should be used.

ArgumentException uses the HRESULT COR_E_ARGUMENT, which has the value 0x80070057.

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

Version Notes

Windows Phone

 ArgumentException displays the message Argument Exception instead of Exception of type 'System.ArgumentException'.

The following example demonstrates how to throw and catch an ArgumentException.


Public Class Example
   Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
      ' ArgumentException is not thrown because 10 is an even number.
      outputBlock.Text += String.Format("10 divided by 2 is {0}", DivideByTwo(10)) & vbCrLf
      Try
         ' ArgumentException is thrown because 7 is not an even number.
         outputBlock.Text += String.Format("7 divided by 2 is {0}", DivideByTwo(7)) & vbCrLf
      Catch Ex As ArgumentException
         ' Show the user that 7 cannot be divided by 2.
         outputBlock.Text &= "7 is not divided by 2 integrally." & vbCrLf
      End Try
   End Sub

   Private Shared Function DivideByTwo(ByVal num As Integer) As Integer
      ' If num is an odd number, throw an ArgumentException.
      If ((num And 1) _
                  = 1) Then
         Throw New ArgumentException("Number must be even", "num")
      End If
      Return (num / 2)
   End Function
End Class
' This code produces the following output.
' 
' 10 divided by 2 is 5
' 7 is not divided by 2 integrally.


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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