将样式应用于表单上的每个按钮

Question

我有以下方法可以正常工作：

button21.FlatAppearance.BorderSize = 0;
button21.FlatAppearance.MouseOverBackColor = System.Drawing.Color.Transparent;

如您所见，我有很多按钮（约 30 个），所以不要在每个按钮上应用样式 - 为什么不在 Form_Load 事件上一次应用所有按钮？所以我写了这个方法：

public void ChangeButtonStyles()
{
    foreach (Control con in this.Controls)
    {
        if (con is Button)
        {
            Button but = con as Button;
            but.FlatAppearance.BorderSize = 0;
            but.FlatAppearance.MouseOverBackColor = System.Drawing.Color.Transparent;
        }
    }
}

但它不起作用，因为当您将鼠标悬停在按钮上时 - 您可以看到背景发生变化，这证明 but.FlatAppearance.MouseOverBackColor = System.Drawing.Color.Transparent; 不起作用

为什么代码不起作用？

public Form1()
{
    InitializeComponent();

  // works
    //button21.FlatAppearance.BorderSize = 0;
    //button21.FlatAppearance.MouseOverBackColor = System.Drawing.Color.Transparent;

  // doesn't work
    ChangeButtonStyles();
}

编辑：解决方案

public void ChangeButtonStyles()
{
    foreach (Control con in this.Controls)
    {
        if (con is Button)
        {
            Button but = con as Button;
            but.FlatAppearance.BorderSize = 0;
            but.FlatAppearance.MouseOverBackColor = System.Drawing.Color.Transparent;
        }
        if (con is GroupBox)
        {
            foreach (Control subcon in con.Controls)
            {
                if (subcon is Button)
                {
                    Button but = subcon as Button;
                    but.FlatAppearance.BorderSize = 0;
                    but.FlatAppearance.MouseOverBackColor = System.Drawing.Color.Transparent;
                }
            }
        }
    }
}

Answer 1

您是否尝试过调试代码以查看它是否真正被执行？ this.Controls 将返回顶级控件。如果按钮嵌套在其他控件中，则需要更加递归。

public void ChangeButtonStyles(Control source)
{
    foreach (Control con in source.Controls)
    {
        if (con is Button)
        {
            Button but = con as Button;
            but.FlatAppearance.BorderSize = 0;
            but.FlatAppearance.MouseOverBackColor = System.Drawing.Color.Transparent;
        }
        else
        {
            ChangeButtonStyles(con);
        }
    }
}