Question

VB.NET 中 Property 用法

Public Property hour() As Integer
Get
Return trkHour.Value
End Get
Set(ByVal Value As Integer)

'set the hour...

trkHour.Value = Value

'determine the state..

Dim hour As Integer = Value

If hour >= 6 And hour < 7 Then
CurrentState = DayAction.TravelingToWork

ElseIf hour >= 7 And hour < 8 Then

CurrentState = DayAction.TravelingToWork

ElseIf hour >= 8 And hour < 13 Then

CurrentState = DayAction.AtLunch

ElseIf hour >= 13 And hour < 14 Then

CurrentState = DayAction.AtWork

ElseIf hour >= 14 And hour < 17 Then

CurrentState = DayAction.RelaxingWithFriends
ElseIf hour >= 17 And hour < 18 Then

ElseIf hour >= 18 And hour < 22 Then
CurrentState = DayAction.GettingReadyForBed
Else
CurrentState = DayAction.Asleep
End If

'set the text...

Dim statusText As String
statusText = "At" & Value & ":00,Len is " & CurrentState.ToString
txtState.Text = statusText
End Set
End Property

其中Property、get、set、作用是什么

Answer 1

Property用于标识一个类成员为属性而不是方法.属性可以被获取,属性在被获以的时候利用get句柄返回其值.属性可以被赋值,这个过程是由set句柄完成的.这两个句柄可以不同时存在.如果只有get而没有set,那属性就是只读的.如果只有set而没有get,那属性就是只写的.