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class System.​DBNull

Assembly: System.Runtime

Inheritance: object → DBNull

Represents a nonexistent value. This class cannot be inherited.

Fields and Constants

public static readonly DBNull
Value
Represents the sole instance of the <see cref="T:System.DBNull" /> class.

Methods

public void
GetObjectData​(SerializationInfo info, StreamingContext context)
info A <see cref="T:System.Runtime.Serialization.SerializationInfo" /> object containing information required to serialize the <see cref="T:System.DBNull" /> object.
context A <see cref="T:System.Runtime.Serialization.StreamingContext" /> object containing the source and destination of the serialized stream associated with the <see cref="T:System.DBNull" /> object.
Implements the <see cref="T:System.Runtime.Serialization.ISerializable" /> interface and returns the data needed to serialize the <see cref="T:System.DBNull" /> object.
public TypeCode
GetTypeCode​()
Returns The <see cref="T:System.TypeCode" /> value for <see cref="T:System.DBNull" /> , which is <see cref="F:System.TypeCode.DBNull" /> .
Gets the <see cref="T:System.TypeCode" /> value for <see cref="T:System.DBNull" /> .
public string
ToString​()
Returns An empty string ( <see cref="F:System.String.Empty" /> ).
Returns an empty string ( <see cref="F:System.String.Empty" /> ).
public string
ToString​(IFormatProvider provider)
provider The <see cref="T:System.IFormatProvider" /> to be used to format the return value. -or- <see langword="null" /> to obtain the format information from the current locale setting of the operating system.
Returns An empty string ( <see cref="F:System.String.Empty" /> ).
Returns an empty string using the specified <see cref="T:System.IFormatProvider" /> .
public bool
Equals​(object obj)
Inherited from object
obj The object to compare with the current object.
Returns <see langword="true" /> if the specified object is equal to the current object; otherwise, <see langword="false" /> .
Determines whether the specified object is equal to the current object.
protected void
Finalize​()
Inherited from object
Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.
public int
GetHashCode​()
Inherited from object
Returns A hash code for the current object.
Serves as the default hash function.
public Type
GetType​()
Inherited from object
Returns The exact runtime type of the current instance.
Gets the <see cref="T:System.Type" /> of the current instance.
protected object
MemberwiseClone​()
Inherited from object
Returns A shallow copy of the current <see cref="T:System.Object" /> .
Creates a shallow copy of the current <see cref="T:System.Object" /> .