A base class for attributes that can appear only once on a single component part.
Inheritance Hierarchy
Object
  Attribute
    Microsoft.VisualStudio.Utilities.SingletonBaseMetadataAttribute
      Microsoft.VisualStudio.Text.Classification.UserVisibleAttribute
      Microsoft.VisualStudio.Text.Editor.DeferCreationAttribute
      Microsoft.VisualStudio.Text.Editor.GridCellLengthAttribute
      Microsoft.VisualStudio.Text.Editor.GridUnitTypeAttribute
      Microsoft.VisualStudio.Text.Editor.MarginContainerAttribute
      Microsoft.VisualStudio.Utilities.DisplayNameAttribute
      Microsoft.VisualStudio.Utilities.FileExtensionAttribute
      Microsoft.VisualStudio.Utilities.NameAttribute
Namespace:  Microsoft.VisualStudio.Utilities
Assembly:  Microsoft.VisualStudio.CoreUtility (in Microsoft.VisualStudio.CoreUtility.dll)
Syntax
'Declaration
<AttributeUsageAttribute(AttributeTargets.Class Or AttributeTargets.Method Or AttributeTargets.Property Or AttributeTargets.Field, AllowMultiple := False)> _
<MetadataAttributeAttribute> _
Public MustInherit Class SingletonBaseMetadataAttribute _
    Inherits Attribute
[AttributeUsageAttribute(AttributeTargets.Class|AttributeTargets.Method|AttributeTargets.Property|AttributeTargets.Field, AllowMultiple = false)]
[MetadataAttributeAttribute]
public abstract class SingletonBaseMetadataAttribute : Attribute
[AttributeUsageAttribute(AttributeTargets::Class|AttributeTargets::Method|AttributeTargets::Property|AttributeTargets::Field, AllowMultiple = false)]
[MetadataAttributeAttribute]
public ref class SingletonBaseMetadataAttribute abstract : public Attribute
[<AbstractClass>]
[<AttributeUsageAttribute(AttributeTargets.Class|AttributeTargets.Method|AttributeTargets.Property|AttributeTargets.Field, AllowMultiple = false)>]
[<MetadataAttributeAttribute>]
type SingletonBaseMetadataAttribute =  
    class 
        inherit Attribute 
    end
public abstract class SingletonBaseMetadataAttribute extends Attribute
The SingletonBaseMetadataAttribute type exposes the following members.
Constructors
| Name | Description | |
|---|---|---|
| .gif) | SingletonBaseMetadataAttribute | Initializes a new instance of SingletonBaseMetadataAttribute. | 
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Properties
| Name | Description | |
|---|---|---|
| .gif) | TypeId | When implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.) | 
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Methods
| Name | Description | |
|---|---|---|
| .gif) | Equals | Infrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.) | 
| .gif) | Finalize | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.) | 
| .gif) | GetHashCode | Returns the hash code for this instance. (Inherited from Attribute.) | 
| .gif) | GetType | Gets the Type of the current instance. (Inherited from Object.) | 
| .gif) | 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.) | 
| .gif) | Match | When overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.) | 
| .gif) | MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) | 
| .gif) | ToString | Returns a string that represents the current object. (Inherited from Object.) | 
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Explicit Interface Implementations
| Name | Description | |
|---|---|---|
| .gif) .gif) | System#Runtime#InteropServices#_Attribute#GetIDsOfNames | Maps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.) | 
| .gif) .gif) | System#Runtime#InteropServices#_Attribute#GetTypeInfo | Retrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.) | 
| .gif) .gif) | System#Runtime#InteropServices#_Attribute#GetTypeInfoCount | Retrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.) | 
| .gif) .gif) | System#Runtime#InteropServices#_Attribute#Invoke | Provides access to properties and methods exposed by an object. (Inherited from Attribute.) | 
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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.