Introduction to attributes of custom components (IV)

II. UI property editor (UITypeEditor)
The attribute editor can implement the pop-up dialog box and drop-down UI mentioned above. Let's talk about it one by one.
1. Pop-up dialog box
In this example, I used the string type attribute to display the version information. You can write all kinds of attributes at will. Here, you only need to specify the attribute editing editor.
First, we need to create a string type attribute. The code is as follows:
Private string _ appVer = "1.0 ";

[CategoryAttribute ("custom editor "),
DefaultValueAttribute ("1.0 "),
DescriptionAttribute ("version information "),
ReadOnlyAttribute (true ),
EditorAttribute (typeof (AppVerConverter), typeof (System. Drawing. Design. UITypeEditor)]
Public string AppVer
{
Get {return this. _ appVer ;}
Set {this. _ appVer = value ;}
}
You may have noticed that there is an additional EditorAttribute (typeof (AppVerConverter), typeof (System. drawing. design. UITypeEditor). For more information, see MSDN. I don't need to talk about it here. Let's take a look at how the AppVerConverter class is implemented. The code is as follows:
/// <Summary>
/// Custom UI property editor (pop-up message)
/// </Summary>
Public class AppVerConverter: System. Drawing. Design. UITypeEditor
{
/// <Summary>
/// Override this method to return the editor type.
/// </Summary>
Public override System. Drawing. Design. UITypeEditorEditStyle GetEditStyle (System. ComponentModel. ITypeDescriptorContext context)