Used to mark a type definition in an assembly as a user-defined type (UDT) in SQL Server. The properties on the attribute reflect the physical characteristics used when the type is registered with SQL Server. This class cannot be inherited.
Assembly: System.Data (in System.Data.dll)
Thetype exposes the following members.
|Format||The serialization format as a Format.|
|IsByteOrdered||Indicates whether the user-defined type is byte ordered.|
|IsFixedLength||Indicates whether all instances of this user-defined type are the same length.|
|MaxByteSize||The maximum size of the instance, in bytes.|
|Name||The SQL Server name of the user-defined type.|
|TypeId||When implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)|
|ValidationMethodName||The name of the method used to validate instances of the user-defined type.|
|Equals||Infrastructure. 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||When overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)|
|ToString||Returns a string that represents the current object. (Inherited from Object.)|
|_Attribute.GetIDsOfNames||Maps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.)|
|_Attribute.GetTypeInfo||Retrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.)|
|_Attribute.GetTypeInfoCount||Retrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.)|
|_Attribute.Invoke||Provides access to properties and methods exposed by an object. (Inherited from Attribute.)|
SQL Server creates a user-defined type that is bound to the type definition that has the custom attribute. Every UDT must be annotated with this attribute. See CLR User-Defined Types for more information about UDTs, including an example of a UDT.
The following example shows the UserDefinedType attribute of the Point UDT. The UDT is byte-ordered, is named "Point", has a validation method named "ValidatePoint", and uses the native serialization format.