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ArgumentNullException Class (System) | Microsoft Learn

ArgumentNullException Class Definition

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.

public ref class ArgumentNullException : ArgumentException

public class ArgumentNullException : ArgumentException

[System.Serializable]
public class ArgumentNullException : ArgumentException

[System.Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public class ArgumentNullException : ArgumentException

type ArgumentNullException = class
    inherit ArgumentException

[<System.Serializable>]
type ArgumentNullException = class
    inherit ArgumentException

[<System.Serializable>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type ArgumentNullException = class
    inherit ArgumentException

Public Class ArgumentNullException
Inherits ArgumentException

Inheritance

Inheritance

Attributes

An ArgumentNullException exception is thrown when a method is invoked and at least one of the passed arguments is null but should never be null.

An ArgumentNullException exception is thrown at run time in the following two major circumstances, both of which reflect developer error:

An uninstantiated object is passed to a method. To prevent the error, instantiate the object.
An object returned from a method call is then passed as an argument to a second method, but the value of the original returned object is null. To prevent the error, check for a return value that is null and call the second method only if the return value is not null.

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.

ArgumentNullException uses the HRESULT E_POINTER, which has the value 0x80004003.

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

Constructors Properties Data

Gets a collection of key/value pairs that provide additional user-defined information about the exception.

(Inherited from Exception) HelpLink

Gets or sets a link to the help file associated with this 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) ParamName

Gets the name of the parameter that causes this exception.

(Inherited from ArgumentException) Source

Gets or sets the name of the application or the object that causes the error.

(Inherited from Exception) StackTrace

Gets a string representation of the immediate frames on the call stack.

(Inherited from Exception) TargetSite

Gets the method that throws the current exception.

(Inherited from Exception) Methods Events SerializeObjectState

Obsolete.

Occurs when an exception is serialized to create an exception state object that contains serialized data about the exception.

(Inherited from Exception) See also

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