Specifies whether a property can only be set at design time.
Assembly: System (in System.dll)
Members marked with the 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 set to false can be set during run time. The default is false.
A property with the set to true has its value serialized to the .resx file instead of the InitializeComponent method.
The following example creates a GetLanguage property. The property is marked with a .
The next example gets the value of the . 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 from the AttributeCollection, and writing it to the console screen.
// Gets the attributes for the property. AttributeCollection attributes = TypeDescriptor.GetProperties(this)["GetLanguage"].Attributes; /* Prints whether the property is marked as DesignOnly * by retrieving the DesignOnlyAttribute from the AttributeCollection. */ DesignOnlyAttribute myAttribute = (DesignOnlyAttribute)attributes[typeof(DesignOnlyAttribute)]; Console.WriteLine("This property is design only :" + myAttribute.IsDesignOnly.ToString());
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.