c# - C# 中带有圆角边框的表单？

Question

我正在使用此代码使表单没有边框样式：

this.FormBorderStyle = FormBorderStyle.None;

我需要在表格上制作圆形边缘。

有没有简单的方法？我该怎么做？

Answer 1

看看这个：http: //msdn.microsoft.com/en-us/library/system.windows.forms.control.region.aspx

Form 类继承自 Control 类，因此请尝试执行与Form 的 Region 属性的链接相同的示例（当然也可以在 form 事件中执行）：

    // This method will change the square button to a circular button by 
// creating a new circle-shaped GraphicsPath object and setting it 
// to the RoundButton objects region.
private void roundButton_Paint(object sender, 
    System.Windows.Forms.PaintEventArgs e)
{

    System.Drawing.Drawing2D.GraphicsPath buttonPath = 
        new System.Drawing.Drawing2D.GraphicsPath();

    // Set a new rectangle to the same size as the button's 
    // ClientRectangle property.
    System.Drawing.Rectangle newRectangle = roundButton.ClientRectangle;

    // Decrease the size of the rectangle.
    newRectangle.Inflate(-10, -10);

    // Draw the button's border.
    e.Graphics.DrawEllipse(System.Drawing.Pens.Black, newRectangle);

    // Increase the size of the rectangle to include the border.
    newRectangle.Inflate( 1,  1);

    // Create a circle within the new rectangle.
    buttonPath.AddEllipse(newRectangle);

    // Set the button's Region property to the newly created 
    // circle region.
    roundButton.Region = new System.Drawing.Region(buttonPath);

}

Answer 2

    public static void RoundBorderForm(Form frm)
    {

        Rectangle Bounds = new Rectangle(0, 0, frm.Width, frm.Height);
        int CornerRadius = 20;
        System.Drawing.Drawing2D.GraphicsPath path = new System.Drawing.Drawing2D.GraphicsPath();
        path.AddArc(Bounds.X, Bounds.Y, CornerRadius, CornerRadius, 180, 90);
        path.AddArc(Bounds.X + Bounds.Width - CornerRadius, Bounds.Y, CornerRadius, CornerRadius, 270, 90);
        path.AddArc(Bounds.X + Bounds.Width - CornerRadius, Bounds.Y + Bounds.Height - CornerRadius, CornerRadius, CornerRadius, 0, 90);
        path.AddArc(Bounds.X, Bounds.Y + Bounds.Height - CornerRadius, CornerRadius, CornerRadius, 90, 90);
        path.CloseAllFigures();

        frm.Region = new Region(path);
        frm.Show();
    }

Answer 3

我知道这个问题已经得到解答，我想添加一个替代方案和愚蠢但不是真正推荐的做法，因为您的问题不会将答案限制为代码......

• 创建一个空白的方形图像，背景颜色作为填充，然后将左上角的圆角擦除为透明，对所有角重复此操作
• 将一种不太可能的颜色设置为表单背景颜色
• 将此颜色设置为TransparencyKey表单上的
• 将图像添加为PictureBox并将它们放在相应的角落

中提琴！