ArgumentNullException Class

Article
01/16/2013

[This documentation is for preview only, and is subject to change in later releases. Blank topics are included as placeholders.]

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
<SerializableAttribute> _
Public Class ArgumentNullException _
    Inherits ArgumentException

[SerializableAttribute]
public class ArgumentNullException : ArgumentException

[SerializableAttribute]
public ref class ArgumentNullException : public ArgumentException

[<SerializableAttribute>]
type ArgumentNullException =  
    class
        inherit ArgumentException
    end

public class ArgumentNullException extends 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, 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
	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.)
	ParamName	Gets the name of the parameter that causes this exception. (Inherited from ArgumentException.)
	StackTrace	Gets a string representation of the immediate frames on the call stack. (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 it is reclaimed by garbage collection. (Inherited from Object.)
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	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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Fields

	Name	Description
	m_HResult	(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 null Nothing nullptr unit a null reference (Nothing in Visual Basic) but should never be null Nothing nullptr unit a 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.

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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