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.NET Framework Class Library

ArgumentNullException Class

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.

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

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)
<SerializableAttribute> _
<ComVisibleAttribute(True)> _
Public Class ArgumentNullException _
	Inherits ArgumentException

The ArgumentNullException type exposes the following members.

  Name Description
Public method Supported by the XNA Framework Supported by Portable Class Library ArgumentNullException() Initializes a new instance of the ArgumentNullException class.
Public method Supported by the XNA Framework Supported by Portable Class Library ArgumentNullException(String) Initializes a new instance of the ArgumentNullException class with the name of the parameter that causes this exception.
Protected method ArgumentNullException(SerializationInfo, StreamingContext) Initializes a new instance of the ArgumentNullException class with serialized data.
Public method Supported by Portable Class Library 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.
Public method Supported by the XNA Framework Supported by Portable Class Library 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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  Name Description
Public property Supported by Portable Class Library Data Gets a collection of key/value pairs that provide additional user-defined information about the exception. (Inherited from Exception.)
Public property Supported by Portable Class Library HelpLink Gets or sets a link to the help file associated with this exception. (Inherited from Exception.)
Public property Supported by the XNA Framework Supported by Portable Class Library HResult Gets or sets HRESULT, a coded numerical value that is assigned to a specific exception. (Inherited from Exception.)
Public property Supported by the XNA Framework Supported by Portable Class Library InnerException Gets the Exception instance that caused the current exception. (Inherited from Exception.)
Public property Supported by the XNA Framework Message Gets the error message and the parameter name, or only the error message if no parameter name is set. (Inherited from ArgumentException.)

In XNA Framework 3.0, this member is inherited from Exception.Message.
Public property Supported by Portable Class Library ParamName Gets the name of the parameter that causes this exception. (Inherited from ArgumentException.)
Public property Supported by Portable Class Library Source Gets or sets the name of the application or the object that causes the error. (Inherited from Exception.)
Public property Supported by the XNA Framework Supported by Portable Class Library StackTrace Gets a string representation of the immediate frames on the call stack. (Inherited from Exception.)
Public property TargetSite Gets the method that throws the current exception. (Inherited from Exception.)
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  Name Description
Public method Supported by the XNA Framework Supported by Portable Class Library Equals(Object) Determines whether the specified object is equal to the current object. (Inherited from Object.)
Protected method Supported by the XNA Framework Supported by Portable Class Library Finalize Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public method Supported by the XNA Framework Supported by Portable Class Library GetBaseException When overridden in a derived class, returns the Exception that is the root cause of one or more subsequent exceptions. (Inherited from Exception.)
Public method Supported by the XNA Framework Supported by Portable Class Library GetHashCode Serves as the default hash function. (Inherited from Object.)
Public method GetObjectData Sets the SerializationInfo object with the parameter name and additional exception information. (Inherited from ArgumentException.)
Public method Supported by the XNA Framework Supported by Portable Class Library GetType Gets the runtime type of the current instance. (Inherited from Exception.)

In XNA Framework 3.0, this member is inherited from Object.GetType().


In Portable Class Library Portable Class Library, this member is inherited from Object.GetType().
Protected method Supported by the XNA Framework Supported by Portable Class Library MemberwiseClone Creates a shallow copy of the current Object. (Inherited from Object.)
Public method Supported by the XNA Framework Supported by Portable Class Library ToString Creates and returns a string representation of the current exception. (Inherited from Exception.)
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  Name Description
Protected event SerializeObjectState Occurs when an exception is serialized to create an exception state object that contains serialized data about the exception. (Inherited from Exception.)
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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.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Portable Class Library

Supported in: Portable Class Library
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.