MergablePropertyAttribute Class
Specifies that this property can be combined with properties belonging to other objects in a Properties window.
Assembly: System (in System.dll)
| Name | Description | |
|---|---|---|
![]() | MergablePropertyAttribute(Boolean) | Initializes a new instance of the MergablePropertyAttribute class. |
| Name | Description | |
|---|---|---|
![]() | AllowMerge | Gets a value indicating whether this property can be combined with properties belonging to other objects in a Properties window. |
![]() | TypeId |
| Name | Description | |
|---|---|---|
![]() | Equals(Object^) | Indicates whether this instance and a specified object are equal.(Overrides Attribute::Equals(Object^).) |
![]() | GetHashCode() | Returns the hash code for this instance.(Overrides Attribute::GetHashCode().) |
![]() | GetType() | |
![]() | IsDefaultAttribute() | Determines if this attribute is the default.(Overrides Attribute::IsDefaultAttribute().) |
![]() | Match(Object^) | 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.) |
| Name | Description | |
|---|---|---|
![]() ![]() | Default | Specifies the default value, which is Yes, that is a property can be combined with properties belonging to other objects in a Properties window. This static field is read-only. |
![]() ![]() | No | Specifies that a property cannot be combined with properties belonging to other objects in a Properties window. This static field is read-only. |
![]() ![]() | Yes | Specifies that a property can be combined with properties belonging to other objects in a Properties window. This static field is read-only. |
| Name | Description | |
|---|---|---|
![]() ![]() | _Attribute::GetIDsOfNames(Guid%, IntPtr, UInt32, UInt32, IntPtr) | Maps a set of names to a corresponding set of dispatch identifiers.(Inherited from Attribute.) |
![]() ![]() | _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.) |
![]() ![]() | _Attribute::GetTypeInfoCount(UInt32%) | Retrieves the number of type information interfaces that an object provides (either 0 or 1).(Inherited from Attribute.) |
![]() ![]() | _Attribute::Invoke(UInt32, Guid%, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr) | Provides access to properties and methods exposed by an object.(Inherited from Attribute.) |
Properties that are marked with the MergablePropertyAttribute set to true can be combined with properties belonging to other objects in a Properties window. Properties that are marked with the MergablePropertyAttribute set to false must be displayed separately. The default is true.
Note |
|---|
When you mark a property with the MergablePropertyAttribute set to true, the value of this attribute is set to the constant member Yes. For a property marked with the MergablePropertyAttribute property set to false, the value is No. Therefore, when you want to check the value of this attribute in your code, you must specify the attribute as MergablePropertyAttribute::Yes or MergablePropertyAttribute::No. |
For more information, see Extending Metadata Using Attributes.
The following example marks a property as appropriate to merge.
public: [MergableProperty(true)] property int MyProperty { int get() { // Insert code here. return 0; } void set( int value ) { // Insert code here. } }
The next example shows how to check the value of the MergablePropertyAttribute for MyProperty. First the code gets a PropertyDescriptorCollection with all the properties for the object. Next it indexes into the PropertyDescriptorCollection to get MyProperty. Then it returns the attributes for this property and saves them in the attributes variable.
The example presents two different ways of checking the value of the MergablePropertyAttribute. In the second code fragment, the example calls the Equals method with a static value. In the last code fragment, the example uses the AllowMerge property to check the value.
// Gets the attributes for the property. AttributeCollection^ attributes = TypeDescriptor::GetProperties( this )[ "MyProperty" ]->Attributes; // Checks to see if the value of the MergablePropertyAttribute is Yes. if ( attributes[ MergablePropertyAttribute::typeid ]->Equals( MergablePropertyAttribute::Yes ) ) { // Insert code here. } // This is another way to see if the property is bindable. MergablePropertyAttribute^ myAttribute = dynamic_cast<MergablePropertyAttribute^>(attributes[ MergablePropertyAttribute::typeid ]); if ( myAttribute->AllowMerge ) { // Insert code here. }
If you marked a class with the MergablePropertyAttribute, use the following code to check the value.
Available since 1.1
Any public static ( Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.






