Asp.Net Programming :: Property. Which one should I use?


	Property. Which one should I use? Hello, Is there a difference between defining a control property in the following two ways: ' Items ... Private _Items As Generic.List(Of ListItem) = New Generic.List(Of ListItem) ** Property Items() As Generic.List(Of ListItem) Get Return _Items End Get Set(ByVal value As Generic.List(Of ListItem)) _Items = value End Set End Property ' Items Or ' Items ... Private _Items As Generic.List(Of ListItem) Property Items() As Generic.List(Of ListItem) Get If _Items Is Nothing Then _Items = New Generic.List(Of WebControl) End If Return _Items End Get Set(ByVal value As Generic.List(Of ListItem)) _Items = value End Set End Property ' Items I marked the differences with . Which approach should I use? Thanks, Miguel Why declare it as ListItem, then assign as WebControl? "shapper" <mdmo@gmail.com> wrote in message news:1180529235.352842.248280@q69g2000hsb.googlegroups.com... - Hide quoted text - > Hello, > Is there a difference between defining a control property in the > following two ways: > ' Items ... > Private _Items As Generic.List(Of ListItem) = New Generic.List(Of > ListItem) > Property Items() As Generic.List(Of ListItem) > Get > Return _Items > End Get > Set(ByVal value As Generic.List(Of ListItem)) > _Items = value > End Set > End Property ' Items > Or > ' Items ... > Private _Items As Generic.List(Of ListItem) > Property Items() As Generic.List(Of ListItem) > Get > If _Items Is Nothing Then > > _Items = New Generic.List(Of WebControl) > End > If > Return _Items > End Get > Set(ByVal value As Generic.List(Of ListItem)) > _Items = value > End Set > End Property ' Items > I marked the differences with . > Which approach should I use? > Thanks, > Miguel On May 30, 2:47 pm, "KJ" <n_o_s_p_a@Mail.com> wrote: - Hide quoted text - > Why declare it as ListItem, then assign as WebControl? > "shapper" <mdmo@gmail.com> wrote in message > news:1180529235.352842.248280@q69g2000hsb.googlegroups.com... > > Hello, > > Is there a difference between defining a control property in the > > following two ways: > > ' Items ... > > Private _Items As Generic.List(Of ListItem) = New Generic.List(Of > > ListItem) > > Property Items() As Generic.List(Of ListItem) > > Get > > Return _Items > > End Get > > Set(ByVal value As Generic.List(Of ListItem)) > > _Items = value > > End Set > > End Property ' Items > > Or > > ' Items ... > > Private _Items As Generic.List(Of ListItem) > > Property Items() As Generic.List(Of ListItem) > > Get > > If _Items Is Nothing Then > > > > _Items = New Generic.List(Of WebControl) > > End > > If > > Return _Items > > End Get > > Set(ByVal value As Generic.List(Of ListItem)) > > _Items = value > > End Set > > End Property ' Items > > I marked the differences with . > > Which approach should I use? > > Thanks, > > Miguel Sorry, That was a type mistake. My question is if I should declare a default value when I do "dim ..." Or use an IF inside Get in property. Thanks, Miguel -----------------------------------------------Reply----------------------------------------------- Miguel, At the very least, you should declare it and assign as Nothing. In the property, you can assign the List to have a value if it's still Nothing. That is fine; it's also known as "Lazy Instantiation" On May 30, 1:21 pm, shapper <mdmo@gmail.com> wrote: - Hide quoted text - > On May 30, 2:47 pm, "KJ" <n_o_s_p_a@Mail.com> wrote: > > Why declare it as ListItem, then assign as WebControl? > > "shapper" <mdmo@gmail.com> wrote in message > >news:1180529235.352842.248280@q69g2000hsb.googlegroups.com... > > > Hello, > > > Is there a difference between defining a control property in the > > > following two ways: > > > ' Items ... > > > Private _Items As Generic.List(Of ListItem) = New Generic.List(Of > > > ListItem) > > > Property Items() As Generic.List(Of ListItem) > > > Get > > > Return _Items > > > End Get > > > Set(ByVal value As Generic.List(Of ListItem)) > > > _Items = value > > > End Set > > > End Property ' Items > > > Or > > > ' Items ... > > > Private _Items As Generic.List(Of ListItem) > > > Property Items() As Generic.List(Of ListItem) > > > Get > > > If _Items Is Nothing Then > > > > > > _Items = New Generic.List(Of WebControl) > > > End > > > If > > > Return _Items > > > End Get > > > Set(ByVal value As Generic.List(Of ListItem)) > > > _Items = value > > > End Set > > > End Property ' Items > > > I marked the differences with **. > > > Which approach should I use? > > > Thanks, > > > Miguel > Sorry, > That was a type mistake. > My question is if I should declare a default value when I do "dim ..." > Or use an IF inside Get in property. > Thanks, > Miguel