2015年4月15日 星期三
[VB問題]並未將物件參考設定為物件的執行個體
原錯誤CODE:
Public Class PilotLight
Dim stateNum As UInteger = 2 '指示燈狀態數量
Dim statePIC As Image() '該狀態圖示(狀態0開始)
==>改Dim statePIC As Image() = New Image(9) {}
Dim pic_sizemode As PictureBoxSizeMode = PictureBoxSizeMode.StretchImage '圖效果
Dim uniqeID As String '物件獨特ID
Dim state As UInteger = 0 '目前燈狀態
.....................
Sub New()
'使指示燈圖拉長或縮小以符合大小
InitializeComponent()
PictureBox1.SizeMode = pic_sizemode
' PictureBox1.Image = statePIC(state)
' Add any initialization after the InitializeComponent() call.
End Sub
Property 狀態數量 As UInteger '最多9組 最少2組
Get
Return stateNum
End Get
Set(value As UInteger)
If value > 10 Then
stateNum = 9
ElseIf value < 2 Then
stateNum = 2
Else
stateNum = value
End If
End Set
End Property
Property 狀態圖示0 As Image
Get
Return statePIC(0)
End Get
Set(value As Image)
statePIC(0) = value
End Set
End Property
Property 狀態圖示1 As Image
Get
Return statePIC(1)
End Get
Set(value As Image)
statePIC(1) = value
End Set
End Property
Property 狀態圖示2 As Image
Get
Return statePIC(2)
End Get
Set(value As Image)
statePIC(2) = value
End Set
End Property
Property 狀態圖示3 As Image
Get
Return statePIC(3)
End Get
Set(value As Image)
statePIC(3) = value
End Set
End Property
Property 狀態圖示4 As Image
Get
Return statePIC(4)
End Get
Set(value As Image)
statePIC(4) = value
End Set
End Property
Property 狀態圖示5 As Image
Get
Return statePIC(5)
End Get
Set(value As Image)
statePIC(5) = value
End Set
End Property
Property 狀態圖示6 As Image
Get
Return statePIC(6)
End Get
Set(value As Image)
statePIC(6) = value
End Set
End Property
Property 狀態圖示7 As Image
Get
Return statePIC(7)
End Get
Set(value As Image)
statePIC(7) = value
End Set
End Property
Property 狀態圖示8 As Image
Get
Return statePIC(8)
End Get
Set(value As Image)
statePIC(8) = value
End Set
End Property
................................................................
簡化寫法參考使用者控制項屬性可以用陣列!
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