ManagementKeyAttribute Class

ManagementKeyAttribute Class

 

The ManagementKey attribute identifies the key properties of a WMI class.

Namespace:   System.Management.Instrumentation
Assembly:  System.Core (in System.Core.dll)

System.Object
  System.Attribute
    System.Management.Instrumentation.ManagementMemberAttribute
      System.Management.Instrumentation.ManagementKeyAttribute

[AttributeUsageAttribute(AttributeTargets.Property | AttributeTargets.Field, 
	AllowMultiple = false)]
[HostProtectionAttribute(SecurityAction.LinkDemand, MayLeakOnAbort = true)]
public sealed class ManagementKeyAttribute : ManagementMemberAttribute

NameDescription
System_CAPS_pubmethodManagementKeyAttribute()

Initializes a new instance of the T:System.Management.ManagementKeyAttribute class. This is the default constructor.

NameDescription
System_CAPS_pubpropertyName

Gets or sets the name of the management attribute.(Inherited from ManagementMemberAttribute.)

System_CAPS_pubpropertyTypeId

When implemented in a derived class, gets a unique identifier for this Attribute.(Inherited from Attribute.)

NameDescription
System_CAPS_pubmethodEquals(Object)

This API supports the product infrastructure and is not intended to be used directly from your code. Returns a value that indicates whether this instance is equal to a specified object.(Inherited from Attribute.)

System_CAPS_pubmethodGetHashCode()

Returns the hash code for this instance.(Inherited from Attribute.)

System_CAPS_pubmethodGetType()

Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_pubmethodIsDefaultAttribute()

When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class.(Inherited from Attribute.)

System_CAPS_pubmethodMatch(Object)

When overridden in a derived class, returns a value that indicates whether this instance equals a specified object.(Inherited from Attribute.)

System_CAPS_pubmethodToString()

Returns a string that represents the current object.(Inherited from Object.)

NameDescription
System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)

Maps a set of names to a corresponding set of dispatch identifiers.(Inherited from Attribute.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr)

Retrieves the type information for an object, which can be used to get the type information for an interface.(Inherited from Attribute.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetTypeInfoCount(UInt32)

Retrieves the number of type information interfaces that an object provides (either 0 or 1).(Inherited from Attribute.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)

Provides access to properties and methods exposed by an object.(Inherited from Attribute.)

Unless a WMI class is a singleton, it can have multiple corresponding instances. Clients of the class must be able to uniquely identify the specific instance they are interested in. So, as a provider writer, you must choose a property or set of properties that uniquely identify an instance of each of your WMI classes. You use the ManagementKeyAttribute attribute to identify those key properties. Properties identified as keys have the same runtime behavior as read-only properties indicated by the ManagementProbeAttribute attribute.

The following example shows how to use the ManagementKeyAttribute to mark a field as a key property of a WMI class.

[ManagementKey]
public int id;

The next example shows how to use the ManagementKeyAttribute attribute to mark a key property of a WMI class.

[C#]

// Use the ManagementKey attribute to specify that this property 
// is used as the key identifier of this class and for the WMI
// instances of this class.  This property must be unique for each
// class instance.
[ManagementKey]
public int Id
{
    get { return System.Diagnostics.Process.GetCurrentProcess().Id; }
}

.NET Framework
Available since 3.5

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

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