從每一個按鈕，在C＃中刪除hover樣式

Question

我想這個代碼在我的C＃項目添加到每個按鈕：

button1.FlatAppearance.MouseDownBackColor = button1.BackColor; 
button1.FlatAppearance.MouseOverBackColor = button1.BackColor; 
button1.FlatStyle = FlatStyle.Flat; 

我試過這個代碼在Form_Load事件，但該變種b保持空：

foreach (Control c in Controls) 
     { 
      Button b = c as Button; 
      if (b != null) 
      { 
       b.FlatAppearance.MouseOverBackColor = b.BackColor; 
       b.FlatAppearance.MouseDownBackColor = b.BackColor; 
       b.FlatStyle = FlatStyle.Flat; 
      } 
     } 

我該怎麼辦？

Answer 1

我只是假設這是關於WinForms。

由於當您的代碼似乎在按鈕直接在窗體上工作時，它們可能位於窗體上的另一個控件（容器）上。你現在可以搜索容器並檢查它們是否包含一個按鈕，但是當它們有容器時也會變得笨拙。因此，我建議使用遞歸：

private List<Control> GetAllControls(Control parent) 
{ 
    List<Control> controls = new List<Control>(); 
    controls.AddRange(parent.Controls.Cast<Control>()); //add all controls directly being on the current control 
    controls.AddRange(parent.Controls.Cast<Control>().SelectMany(GetAllControls)); //add all children from each control 
    return controls; 
} 

，你可以這樣調用：

foreach (Control c in GetAllControls(this)) 
{ 
    Button b = c as Button; 
    if (b != null) 
    { 
     b.FlatAppearance.MouseOverBackColor = b.BackColor; 
     b.FlatAppearance.MouseDownBackColor = b.BackColor; 
     b.FlatStyle = FlatStyle.Flat; 
    } 
} 

你可以閱讀更多關於遞歸here。