JsonExtensionDataAttribute Class
Definition
Important
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When placed on a property of type IDictionary<TKey,TValue>, any properties that do not have a matching member are added to that dictionary during deserialization and written during serialization.
public ref class JsonExtensionDataAttribute sealed : System::Text::Json::Serialization::JsonAttribute[System.AttributeUsage(System.AttributeTargets.Field | System.AttributeTargets.Property, AllowMultiple=false)]
public sealed class JsonExtensionDataAttribute : System.Text.Json.Serialization.JsonAttribute[System.AttributeUsage(System.AttributeTargets.Property, AllowMultiple=false)]
public sealed class JsonExtensionDataAttribute : System.Text.Json.Serialization.JsonAttribute[<System.AttributeUsage(System.AttributeTargets.Field | System.AttributeTargets.Property, AllowMultiple=false)>]
type JsonExtensionDataAttribute = class
inherit JsonAttribute[<System.AttributeUsage(System.AttributeTargets.Property, AllowMultiple=false)>]
type JsonExtensionDataAttribute = class
inherit JsonAttributePublic NotInheritable Class JsonExtensionDataAttribute
Inherits JsonAttribute- Inheritance
- Attributes
Remarks
The dictionary's TKey value must be String, and TValue must be JsonElement or Object.
During deserialization, when using Object, a "null" JSON value is treated as a null object reference, and when using JsonElement, a "null" is treated as a JsonElement with ValueKind set to JsonValueKind.Null.
During serialization, the name of the extension data property is not included in the JSON; the data contained within the extension data is serialized as properties of the JSON object.
If there is more than one property on a type with this extension data attribute, or if the property itself is not of the correct IDictionary<TKey,TValue> type, an InvalidOperationException is thrown during the first serialization or deserialization of that type.
For more information, see How to handle overflow JSON with System.Text.Json.
Constructors
| JsonExtensionDataAttribute() |
Initializes a new instance of the JsonExtensionDataAttribute 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) |
