删除选项卡C＃Winforms上的按钮边框

Question

I have a button on my form that has flat style applied and uses a background image, I have removed all borders from the button, but when I tab onto the button from another control a black border appears around the button.

This can be seen in the image below. On the left is the button with black border on the right is a different button but shows how the cancel button should look.

Answer 1

I do not get this border, if I set the BoderSize to 0 in the FlatAppearance section.

---

Further investigation shows that this border appears only when the button is the default button. You can create your own button, which does never show this border like this

public class NoNotifyButton: System.Windows.Forms.Button
{
    public override void NotifyDefault(bool value)
    {
    }
}

Note: NotifyDefault remains intentionally empty.

Answer 2

你必须要使用一个新的按钮类IButtonControl和变化NotifyDefault为false：

base.NotifyDefault(false);

Answer 3

您可以将按钮属性“ ForeColor”设置为透明

Answer 4

You don't have to create a derived class. You can set the ForeColor to be the same as parent control BackColor. As follows :

btn1.ForeColor = btn1.Parent.BackColor;

Answer 5

I managed to get around this by setting the button TabStop property to False and then using this code on the button click event

private void sendBackTab()
        {
            System.Windows.Forms.SendKeys.SendWait("+{TAB}");
        }