Question

我有很多文本框，我希望他们在聚焦时更改backColor。

这是加载表单时的代码

Public Sub New()
    Me.InitializeComponent()
    For Each c  As Control In Me.Controls
        If TypeOf c Is TextBox Then 
            AddHandler c.Enter, AddressOf Me.changeBg
            AddHandler c.Leave, AddressOf Me.restoreBg
        End If
    Next
End Sub

这就是听众

Sub changeBg(sender As Object, e As EventArgs)
    'Dim c As Control = sender
    'sender.BackColor = System.Drawing.ColorTranslator.FromOle(&HFFFF9D)
End Sub

如何获取文本框控件并更改其backColor？因为我把发件人作为对象

Answer 1

我最后为vb添加了正确的演员

Dim tb As TextBox = DirectCast(sender, TextBox)
tb.BackColor  = System.Drawing.ColorTranslator.FromOle(&HFFFF9D)

正如它在这里做的那样

投射事件发件人以控制http://www.java2s.com/Tutorial/VB/0260__GUI/Casteventsendertocontrol.htm

在这里 Casting in visual basic?

更改发件人TextBox的backColor

1 个答案: