NullReferenceException Constructors

Definition

Namespace:

System

Assembly:

System.Runtime.dll

Initializes a new instance of the NullReferenceException class.

Overloads

NullReferenceException()	Initializes a new instance of the NullReferenceException class, setting the Message property of the new instance to a system-supplied message that describes the error, such as "The value 'null' was found where an instance of an object was required." This message takes into account the current system culture.
NullReferenceException(String)	Initializes a new instance of the NullReferenceException class with a specified error message.
NullReferenceException(SerializationInfo, StreamingContext)	Obsolete. Initializes a new instance of the NullReferenceException class with serialized data.
NullReferenceException(String, Exception)	Initializes a new instance of the NullReferenceException class with a specified error message and a reference to the inner exception that is the cause of this exception.

NullReferenceException()

Source:

NullReferenceException.cs

Initializes a new instance of the NullReferenceException class, setting the Message property of the new instance to a system-supplied message that describes the error, such as "The value 'null' was found where an instance of an object was required." This message takes into account the current system culture.

public:
 NullReferenceException();

public NullReferenceException ();

Public Sub New ()

Remarks

The following table shows the initial property values for an instance of NullReferenceException.

Property	Value
InnerException	null.
Message	The localized error message string.

NullReferenceException(String)

Source:

NullReferenceException.cs

Initializes a new instance of the NullReferenceException class with a specified error message.

public:
 NullReferenceException(System::String ^ message);

public NullReferenceException (string? message);

new NullReferenceException : string -> NullReferenceException

Public Sub New (message As String)

Parameters

message

String

A String that describes the error. The content of message is intended to be understood by humans. The caller of this constructor is required to ensure that this string has been localized for the current system culture.

Remarks

The following table shows the initial property values for an instance of NullReferenceException.

Property	Value
InnerException	null.
Message	The error message string.

NullReferenceException(SerializationInfo, StreamingContext)

Source:

NullReferenceException.cs

Caution

This API supports obsolete formatter-based serialization. It should not be called or extended by application code.

Initializes a new instance of the NullReferenceException class with serialized data.

protected:
 NullReferenceException(System::Runtime::Serialization::SerializationInfo ^ info, System::Runtime::Serialization::StreamingContext context);

[System.Obsolete("This API supports obsolete formatter-based serialization. It should not be called or extended by application code.", DiagnosticId="SYSLIB0051", UrlFormat="https://aka.ms/dotnet-warnings/{0}")]
protected NullReferenceException (System.Runtime.Serialization.SerializationInfo info, System.Runtime.Serialization.StreamingContext context);

[<System.Obsolete("This API supports obsolete formatter-based serialization. It should not be called or extended by application code.", DiagnosticId="SYSLIB0051", UrlFormat="https://aka.ms/dotnet-warnings/{0}")>]
new NullReferenceException : System.Runtime.Serialization.SerializationInfo * System.Runtime.Serialization.StreamingContext -> NullReferenceException

Protected Sub New (info As SerializationInfo, context As StreamingContext)

Parameters

info

SerializationInfo

The object that holds the serialized object data.

context

StreamingContext

The contextual information about the source or destination.

Attributes

ObsoleteAttribute

Remarks

This constructor is called during deserialization to reconstitute the exception object transmitted over a stream. For more information, see XML and SOAP Serialization.

See also

• XML and SOAP Serialization

NullReferenceException(String, Exception)

Source:

NullReferenceException.cs

Initializes a new instance of the NullReferenceException class with a specified error message and a reference to the inner exception that is the cause of this exception.

public:
 NullReferenceException(System::String ^ message, Exception ^ innerException);

public NullReferenceException (string? message, Exception? innerException);

new NullReferenceException : string * Exception -> NullReferenceException

Public Sub New (message As String, innerException As Exception)

Parameters

message

String

The error message that explains the reason for the exception.

innerException

Exception

The exception that is the cause of the current exception. If the innerException parameter is not null, the current exception is raised in a catch block that handles the inner exception.

Remarks

An exception that is thrown as a direct result of a previous exception should include a reference to the previous exception in the InnerException property. The InnerException property returns the same value that is passed into the constructor, or null if the InnerException property does not supply the inner exception value to the constructor.

The following table shows the initial property values for an instance of NullReferenceException.

Property	Value
InnerException	The inner exception reference.
Message	The error message string.

See also

• Exception
• Handling and Throwing Exceptions