Article
11/18/2011

ArgumentNullException Class

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

The exception that is thrown when a null reference (Nothing in Visual Basic) is passed to a method that does not accept it as a valid argument.

Inheritance Hierarchy

System.Object
  System.Exception
    System.SystemException
      System.ArgumentException
        System.ArgumentNullException

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

Syntax

'Declaration
<ComVisibleAttribute(True)> _
Public Class ArgumentNullException _
    Inherits ArgumentException

[ComVisibleAttribute(true)]
public class ArgumentNullException : ArgumentException

The ArgumentNullException type exposes the following members.

Constructors

	Name	Description
	ArgumentNullException()	Initializes a new instance of the ArgumentNullException class.
	ArgumentNullException(String)	Initializes a new instance of the ArgumentNullException class with the name of the parameter that causes this exception.
	ArgumentNullException(String, Exception)	Initializes a new instance of the ArgumentNullException class with a specified error message and the exception that is the cause of this exception.
	ArgumentNullException(String, String)	Initializes an instance of the ArgumentNullException class with a specified error message and the name of the parameter that causes 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 the error message and the parameter name, or only the error message if no parameter name is set. (Inherited from ArgumentException.)
	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

ArgumentNullException is thrown when a method is invoked and at least one of the passed arguments is nulla null reference (Nothing in Visual Basic) but should never be nulla null reference (Nothing in Visual Basic).

ArgumentNullException behaves identically to ArgumentException. It is provided so that application code can differentiate between exceptions caused by null arguments and exceptions caused by arguments that are not null. For errors caused by arguments that are not null, see ArgumentOutOfRangeException.

For a list of initial property values for an instance of ArgumentNullException, see the ArgumentNullException 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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