Question

我是C＃的初学者，试图制作一个软件，我正处于我必须选择座位（按钮）并将其名称添加到数据库的阶段。以下是目前的代码：

static int i;
int m = 0;// m is the maximum no of seats that can be selected.
public void seatSelector(Button btn) //Function To Change Seat Colour on Click
    {
        if (i < m && btn.BackColor == Color.Transparent)
        {
            btn.BackColor = Color.Green;
            i++;
        }
        else if (i <= m && btn.BackColor == Color.Green)
        {
            btn.BackColor = Color.Transparent;
            i--;
        }
    }
//Lets assume I have total 4 seats(designed as buttons)
private void Seat1A_Click(object sender, EventArgs e)
    {
        seatSelector(Seat1A);
    }
    private void Seat1B_Click(object sender, EventArgs e)
    {
        seatSelector(Seat1B);  
    }
    private void Seat1C_Click(object sender, EventArgs e)
    {
        seatSelector(Seat1C);
    }
    private void Seat2D_Click(object sender, EventArgs e)
    {
        seatSelector(Seat2D);
    }

我的问题是，如何提取颜色为绿色的座位（按钮）名称。谢谢

Answer 1

您可以通过多种方式完成您的目标。

我的一个建议是循环浏览按钮控件并查看已点击的按钮。

//Loop through all controls


Foreach (Button s in Page.Controls.OfType<Button>())
    {
        //Check button color
        IF (s.BackColor = Color.Green) Then
        { 
           //This Button is highlighted
           //do stuff;
        }
    }

Answer 2

或者你可以做到

// in constructor
Seat1A.Click += seatSelector;
Seat1B.Click += seatSelector;
Seat1C.Click += seatSelector;
// etc.
//. . . . . . 
// !!! - What you need here is 3 states: unavailable, selected, unselected
// In the beginning you should fill unavailable

private List<string> _unavailable = new ...   //(fill this on form open from db)
// paint unavailable in [lets say] blue
private void PaintUnavailable()
{
    foreach (Control c in surface.Controls)
    {
        if (c.GetType() == typeof(Button) && _unavailable.Contains(c.Text)) 
        {
             c.BackColor = Color.Blue; // or ((Button)c).BackColor = Color.Blue
        }
    }
}


private List<string> _selected = new ...


private void SeatSelector(object sender, EventArgs e)
{
    var btn = (Button)sender;

    if (!_unavailable.Contains(btn.Text))
    {
        if (btn.BackColor == Color.Transparent)
        {
            btn.BackColor = Color.Green;
            _selected.Add(btn.Text);
        }
        else if (BackColor == Color.Green)
        {
            btn.BackColor = Color.Transparent;
            _selected.Remove(btn.Text);
        }
    }

}

然后你可以使用“selected”来写入db。这只是一个例子，通常需要发生的简单样本。 String/button.text不是最好的方法。您可以让每个按钮在Tag属性等中具有特定对象

检查突出显示的按钮

2 个答案: