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AllowNullAttribute Class

  • Reference

Definition

Namespace:
System.Diagnostics.CodeAnalysis
Assembly:
System.Runtime.dll
Assembly:
netstandard.dll

Specifies that null is allowed as an input even if the corresponding type disallows it.

public ref class AllowNullAttribute sealed : Attribute
[System.AttributeUsage(System.AttributeTargets.Field | System.AttributeTargets.Parameter | System.AttributeTargets.Property, Inherited=false)]
public sealed class AllowNullAttribute : Attribute
[<System.AttributeUsage(System.AttributeTargets.Field | System.AttributeTargets.Parameter | System.AttributeTargets.Property, Inherited=false)>]
type AllowNullAttribute = class
    inherit Attribute
Public NotInheritable Class AllowNullAttribute
Inherits Attribute
Inheritance
Object
Attribute
AllowNullAttribute
Attributes
AttributeUsageAttribute

Remarks

To override a method that has a parameter annotated with this attribute, use the ? operator. For example: override ISet<Enum> ReadJson(JsonReader reader, Type objectType, ISet<Enum>? existingValue, bool hasExistingValue, JsonSerializer serializer). For more information, see Nullable static analysis in the C# guide.

Constructors

AllowNullAttribute()

Initializes a new instance of the AllowNullAttribute class.

Properties

TypeId

When implemented in a derived class, gets a unique identifier for this Attribute.

(Inherited from Attribute)

Methods

Equals(Object)

Returns a value that indicates whether this instance is equal to a specified object.

(Inherited from Attribute)
GetHashCode()

Returns the hash code for this instance.

(Inherited from Attribute)
GetType()

Gets the Type of the current instance.

(Inherited from Object)
IsDefaultAttribute()

When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class.

(Inherited from Attribute)
Match(Object)

When overridden in a derived class, returns a value that indicates whether this instance equals a specified object.

(Inherited from Attribute)
MemberwiseClone()

Creates a shallow copy of the current Object.

(Inherited from Object)
ToString()

Returns a string that represents the current object.

(Inherited from Object)

Applies to

See also