'Declaration
 
Protected Overridable Sub OnItemAdding( _
   ByVal item As ColumnBase _
) 

'Usage
 
Dim instance As ObservableColumnCollection
Dim item As ColumnBase
 
instance.OnItemAdding(item)

protected virtual void OnItemAdding( 
   ColumnBase item
)

Parameters

item

.NET: net5.0, net5.0-windows, net6.0, net6.0-macos, net6.0-windows, net7.0, net7.0-macos, net7.0-windows, net8.0, net8.0-browser, net8.0-macos, net8.0-windows, net9.0, net9.0-browser, net9.0-macos, net9.0-windows, net10.0, net10.0-browser, net10.0-macos, net10.0-windows.

.NET Framework: net40, net403, net45, net451, net452, net46, net461, net462, net463, net47, net471, net472, net48, net481.

Reference

ObservableColumnCollection Class
ObservableColumnCollection Members