DesignOnlyAttribute Class
Assembly: System (in system.dll)
'Declaration <AttributeUsageAttribute(AttributeTargets.All)> _ Public NotInheritable Class DesignOnlyAttribute Inherits Attribute 'Usage Dim instance As DesignOnlyAttribute
/** @attribute AttributeUsageAttribute(AttributeTargets.All) */ public final class DesignOnlyAttribute extends Attribute
AttributeUsageAttribute(AttributeTargets.All) public final class DesignOnlyAttribute extends Attribute
Not applicable.
Members marked with the DesignOnlyAttribute set to true can be set only at design time. Typically, these properties exist only at design time and do not correspond to a real property on the object at run time.
Members that either have no attribute or are marked with the DesignOnlyAttribute set to false can be set during run time. The default is false.
A property with the DesignOnlyAttribute set to true has its value serialized to the .resx file instead of the InitializeComponent method.
For more information, see Attributes Overview and Extending Metadata Using Attributes.
The following example creates a GetLanguage property. The property is marked with a DesignOnlyAttribute.
<DesignOnly(True)> _ Public Property GetLanguage() As CultureInfo Get ' Insert code here. Return myCultureInfo End Get Set ' Insert code here. End Set End Property
/** @attribute DesignOnly(true)
*/
/** @property
*/
public CultureInfo get_GetLanguage()
{
// Insert code here.
return myCultureInfo;
} //get_GetLanguage
/** @property
*/
public void set_GetLanguage(CultureInfo value)
{
// Insert code here.
} //set_GetLanguage
The next example gets the value of the DesignOnlyAttribute. First the code gets a PropertyDescriptorCollection with all the properties for the object. Next it indexes into the PropertyDescriptorCollection to find the GetLanguage property. Then it returns the attributes for this property and saves them in the attributes variable.
The example then prints whether the property is design only by retrieving DesignOnlyAttribute from the AttributeCollection, and writing it to the console screen.
' Gets the attributes for the property. Dim attributes As AttributeCollection = _ TypeDescriptor.GetProperties(Me)("GetLanguage").Attributes ' Prints whether the property is marked as DesignOnly ' by retrieving the DesignOnlyAttribute from the AttributeCollection. Dim myAttribute As DesignOnlyAttribute = _ CType(attributes(GetType(DesignOnlyAttribute)), DesignOnlyAttribute) Console.WriteLine(("This property is design only :" & _ myAttribute.IsDesignOnly.ToString()))
// Gets the attributes for the property.
AttributeCollection attributes = TypeDescriptor.GetProperties(this).
get_Item("GetLanguage").get_Attributes();
/* Prints whether the property is marked as DesignOnly
by retrieving the DesignOnlyAttribute from the AttributeCollection. */
DesignOnlyAttribute myAttribute = (DesignOnlyAttribute)(attributes.
get_Item(DesignOnlyAttribute.class.ToType()));
Console.WriteLine("This property is design only :"
+ System.Convert.ToString(myAttribute.get_IsDesignOnly()));
Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.