按钮应每两次按下更改文本

Question

我正在尝试使用 Visual Basic 创建一个井字游戏。按下按钮后，按钮应首先变为“O”，然后下一次按下应为“X”，但它似乎继续放置“O”。

    Dim turn As Boolean
    turn = True 'true = X turn, false = Y turn
    Dim b As Button

    b = DirectCast(sender, Button)
    If (turn) Then
        b.Text = "O"
    Else
        b.Text = "X"
        turn = Not turn <<< This seems to not to be working...

        b.Enabled = False
    End If

Answer 1

需要在方法外声明turn变量，使其成为类的成员，而不是每次都重新创建的局部变量。

此外，您应该在每次更改后翻转状态，不仅是在放置 X 时，在禁用按钮时也是如此。

例子：

Dim turn As Boolean = True 'true = X turn, false = Y turn

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click

  Dim b As Button = DirectCast(sender, Button)

  If turn Then
    b.Text = "O"
  Else
    b.Text = "X"
  End If

  turn = Not turn
  b.Enabled = False
End Sub