.NET Framework Class Library
QualificationDataAttribute Class

Provides developer-specified data for a pipeline segment.

Inheritance Hierarchy
SystemObject
   SystemAttribute
    System.AddIn.PipelineQualificationDataAttribute

Namespace:   System.AddIn.Pipeline
Assembly:  System.AddIn.Contract (in System.AddIn.Contract.dll)
Syntax
<[%$TOPIC/bb470574_en-us_VS_110_2_0_0_0_0%]([%$TOPIC/bb470574_en-us_VS_110_2_0_0_0_1%].Class Or [%$TOPIC/bb470574_en-us_VS_110_2_0_0_0_2%].Interface, AllowMultiple := True)> _
Public NotInheritable Class QualificationDataAttribute _
	Inherits [%$TOPIC/bb470574_en-us_VS_110_2_0_0_0_3%]
[[%$TOPIC/bb470574_en-us_VS_110_2_0_1_0_0%]([%$TOPIC/bb470574_en-us_VS_110_2_0_1_0_1%].Class|[%$TOPIC/bb470574_en-us_VS_110_2_0_1_0_2%].Interface, AllowMultiple = true)]
public sealed class QualificationDataAttribute : [%$TOPIC/bb470574_en-us_VS_110_2_0_1_0_3%]
[[%$TOPIC/bb470574_en-us_VS_110_2_0_2_0_0%]([%$TOPIC/bb470574_en-us_VS_110_2_0_2_0_1%]::Class|[%$TOPIC/bb470574_en-us_VS_110_2_0_2_0_2%]::Interface, AllowMultiple = true)]
public ref class QualificationDataAttribute sealed : public [%$TOPIC/bb470574_en-us_VS_110_2_0_2_0_3%]
[<[%$TOPIC/bb470574_en-us_VS_110_2_0_3_0_0%]>]
[<[%$TOPIC/bb470574_en-us_VS_110_2_0_3_0_1%]([%$TOPIC/bb470574_en-us_VS_110_2_0_3_0_2%].Class|[%$TOPIC/bb470574_en-us_VS_110_2_0_3_0_3%].Interface, AllowMultiple = true)>]
type QualificationDataAttribute =  
    class 
        inherit [%$TOPIC/bb470574_en-us_VS_110_2_0_3_0_4%] 
    end

The QualificationDataAttribute type exposes the following members.

Constructors
  NameDescription
Public method QualificationDataAttributeInitializes a new instance of the QualificationDataAttribute class.
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Properties
  NameDescription
Public property NameGets the name, which serves as a key, of a key/value pair.
Public property TypeIdWhen implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)
Public property ValueGets the value of a key/value pair.
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Methods
  NameDescription
Public method EqualsInfrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
Public method GetHashCodeReturns the hash code for this instance. (Inherited from Attribute.)
Public method GetTypeGets the Type of the current instance. (Inherited from Object.)
Public method IsDefaultAttributeWhen overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute.)
Public method MatchWhen overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
Public method ToStringReturns a string that represents the current object. (Inherited from Object.)
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Explicit Interface Implementations
  NameDescription
Explicit interface implemetation Private method _AttributeGetIDsOfNamesMaps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.)
Explicit interface implemetation Private method _AttributeGetTypeInfoRetrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.)
Explicit interface implemetation Private method _AttributeGetTypeInfoCountRetrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.)
Explicit interface implemetation Private method _AttributeInvokeProvides access to properties and methods exposed by an object. (Inherited from Attribute.)
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Remarks

You can use this attribute to assign data, in the form of name-value string pairs, for any purpose to a pipeline segment. For example, you can indicate that an add-in should be loaded into an external process.

The Rebuild and Update methods, which maintain the store of information about available pipeline segments, use this attribute to identify a segment that has qualification data.

To access the qualification data for a pipeline segment, see the QualificationData property. To enumerate the data for all the pipeline segments, see the QualificationDataItem class.

Qualification data is only read by the host and is not consumed by the add-in system in any other way.

You can apply qualification data to a pipeline segment by placing a QualificationDataAttribute attribute next to the segment attribute. For more information about pipeline segments and their attributes, see Pipeline Development.

Examples

The following example applies qualification data to an add-in.

' This pipeline segment has 
' two attributes: 
' 1 - An AddInAttribute to identify 
'     this segment as an add-in. 
' 
' 2 - A QualificationDataAttribute to 
'     indicate that the add-in should 
'     be loaded into a new application domain.

<AddIn("Calculator Add-in", Version:="2.0.0.0")> _
<QualificationData("Isolation", "NewAppDomain")> _
    Public Class SampleV2AddIn
// This pipeline segment has 
// two attributes: 
// 1 - An AddInAttribute to identify 
//     this segment as an add-in. 
// 
// 2 - A QualificationDataAttribute to 
//     indicate that the add-in should 
//     be loaded into a new application domain.

    [AddIn("Calculator Add-in",Version="2.0.0.0")]
    [QualificationData("Isolation", "NewAppDomain")]
    public class SampleV2AddIn : Calculator2
    {
Version Information

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
Platforms

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Thread Safety
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.