Question

大家好我动态创建了一些按钮，当用户点击按钮时，我需要将所选按钮的BackColor设置为某些突出显示的颜色，根据我编写的代码，它为每个按钮应用颜色，而不是我需要为用户点击按钮应用颜色

我创建按钮的代码如下

for(int i=0;i<5;i++)
{
    Button btyDynamic = new Button();
    btyDynamic .Click += new EventHandler(btyDynamic _Click);
    btyDynamic .AutoSizeMode = AutoSizeMode.GrowAndShrink;
    btyDynamic .AutoSize = true;
    btyDynamic .Text = i.ToString();
    btyDynamic .Tag = i.ToString();;
}

protected void btyDynamic(object sender, EventArgs e)
{
   Button btn= sender as Button;
   string strTag= btn.Tag.ToString();
   switch(strTag)
   {
      case "0":
         btn.BackColor=Color.LightSteelBlue;
       break;
     // Like this I am writing, now when in Case2 I need to remove the color of the first button and to show the backcolor of second button
   }
}

Answer 1

您可以存储所选的最后一个按钮，然后重置BackColor：

private Button _lastButtonSelected = null;
protected void btyDynamic(object sender, EventArgs e)
{
   // Set new button back color
   Button btn = sender as Button;
   if(btn != null)
   {
      btn.BackColor = Color.LightSteelBlue;
   }
   // Reset last button color
   if(_lastButtonSelected != null)
   {
      _lastButtonSelected.BackColor = ...; // Put default back color here
   }
   _lastButtonSelected = btn;
}

如果您希望BackColor保持LightSteelBlue，如果您点击两次相同的按钮，则只需要检查_lastButtonSelected != btn。

Answer 2

你可以为所有按钮制作一个foreach，并删除不等于发送者的所有按钮的背景。假设将所有按钮保存到数组中（_AllButtons）。你可以写一些像这样的代码：

Button btn= sender as Button;
foreach(var currentButton in _AllButtons) {
   if(currentButton !=btn) {
        currentButton.BackColor=Color.Transparent;
   }
}

Answer 3

可能的算法是：

按照您的方式创建按钮一次，并将click事件绑定到一个处理程序
首先将所有按钮重置为标准背景颜色
使用开关查找当前单击的按钮，并设置此按钮的颜色

示例代码：

Action resetButtonColor = () => 
{
    button1.BackColor = Colors.Red;
    button2.BackColor = Colors.Red
    button3.BackColor = Colors.Red;
};

resetButtonColor();

var selected = Colors.Green;
switch(strTag)
{
    case "1": button1.BackColor = selected;
    case "2": button2.BackColor = selected;
    case "3": button3.BackColor = selected;
}

Answer 4

然后你必须明确地分配这个按钮的点击事件。所有其他人都可以有这个处理程序，但是一个按钮不应该，因为它太通用了这样处理。

Answer 5

你可以试试这个：

    Color highLite = Color.Black;

    public Form1()
    {
        InitializeComponent();
        for (int i = 0; i < 20; i++)
        {
            Button b = new Button();
            b.Text = i.ToString();
            b.Tag = null;
            b.Click += b_Click;
            flowLayoutPanel1.Controls.Add(b);
        }
    }

    void b_Click(object sender, EventArgs e)
    {
        Button b = sender as Button;
        if (b == null)
            return;

        b.BackColor = highLite;

        // clear backcolors
        foreach (Control c in flowLayoutPanel1.Controls)
            if (c != b)
                c.BackColor = SystemColors.Control;
    }

Answer 6

确保您只设置要设置的控件的后置颜色。使标签具有独特的功能，告诉您要更改它。

private Color offColor = Color.Red;
private Color onColor = Color.Blue;
private String btyPrefix = "bty";

private void btyDynamic_click(object sender, EventArgs e)
{
    Control control = (Control)sender;
    // enumerate this.Controls, but if they go into a different container, enumerate over that
    this.Controls.OfType<Control>()
        .Where(c => ((String)c.Tag).Contains(btyPrefix))
        .ToList<Control>()
        .ForEach(c =>
            {
                if (control == c)
                    c.BackColor = onColor;
                else
                    c.BackColor = offColor;
            }
    );
}

private void Form1_Load(object sender, EventArgs e)
{
    Button btyDontChange = new Button();
    btyDontChange.AutoSize = true;
    btyDontChange.AutoSizeMode = AutoSizeMode.GrowAndShrink;
    btyDontChange.Text = "x";
    btyDontChange.Tag = "something";
    btyDontChange.Location = new Point(0, 0);
    this.Controls.Add(btyDontChange);
    for (int i = 0; i < 5; i++)
    {
        Button btyDynamic = new Button();
        btyDynamic.Click += new EventHandler(btyDynamic_click);
        btyDynamic.AutoSizeMode = AutoSizeMode.GrowAndShrink;
        btyDynamic.AutoSize = true;
        btyDynamic.Text = i.ToString();
        btyDynamic.Tag = btyPrefix + i.ToString();
        btyDynamic.Location = new Point((i+1) * 50, 0);
        btyDynamic.BackColor = offColor;
        this.Controls.Add(btyDynamic);
    }
}

将backcolor设置为用户单击的按钮

6 个答案: