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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 ref class ArgumentNullException : public ArgumentException

The ArgumentNullException type exposes the following members.

  NameDescription
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsArgumentNullException()Initializes a new instance of the ArgumentNullException class.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsArgumentNullException(String)Initializes a new instance of the ArgumentNullException class with the name of the parameter that causes this exception.
Protected methodArgumentNullException(SerializationInfo, StreamingContext)Initializes a new instance of the ArgumentNullException class with serialized data.
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsArgumentNullException(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 methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsArgumentNullException(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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  NameDescription
Public propertySupported by Portable Class LibrarySupported in .NET for Windows Store appsDataGets a collection of key/value pairs that provide additional user-defined information about the exception. (Inherited from Exception.)
Public propertySupported by Portable Class LibrarySupported in .NET for Windows Store appsHelpLinkGets or sets a link to the help file associated with this exception. (Inherited from Exception.)
Public propertySupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsHResultGets or sets HRESULT, a coded numerical value that is assigned to a specific exception. (Inherited from Exception.)
Public propertySupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsInnerExceptionGets the Exception instance that caused the current exception. (Inherited from Exception.)
Public propertySupported by the XNA FrameworkMessageGets 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 propertySupported by Portable Class LibrarySupported in .NET for Windows Store appsParamNameGets the name of the parameter that causes this exception. (Inherited from ArgumentException.)
Public propertySupported by Portable Class LibrarySupported in .NET for Windows Store appsSourceGets or sets the name of the application or the object that causes the error. (Inherited from Exception.)
Public propertySupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsStackTraceGets a string representation of the immediate frames on the call stack. (Inherited from Exception.)
Public propertyTargetSiteGets the method that throws the current exception. (Inherited from Exception.)
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  NameDescription
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Protected methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsGetBaseExceptionWhen overridden in a derived class, returns the Exception that is the root cause of one or more subsequent exceptions. (Inherited from Exception.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsGetHashCodeServes as the default hash function. (Inherited from Object.)
Public methodGetObjectDataSets the SerializationInfo object with the parameter name and additional exception information. (Inherited from ArgumentException.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsGetTypeGets 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().


In .NET for Windows Store apps Windows 8, this member is inherited from Object::GetType().
Protected methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsToStringCreates and returns a string representation of the current exception. (Inherited from Exception.)
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  NameDescription
Protected eventSerializeObjectStateOccurs 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 nullptr but should never be nullptr.

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 nullptr. To prevent the error, check for a return value that is nullptr and call the second method only if the return value is not nullptr.

ArgumentNullException behaves identically to ArgumentException. It is provided so that application code can differentiate between exceptions caused by nullptr 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: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

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

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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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