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This question already has answers here:

How to Draw a Rounded Rectangle with WinForms (.NET)? (6 answers)

Closed 6 years ago.

我正在使用这一法典,使表格没有边界风格:

this.FormBorderStyle = FormBorderStyle.None;

我需要在表格上进行四舍五入。

是否容易? 我如何这样做?

Answer 1

查阅:。

The Form class inherits from the Control class, so try doing the same sample that you have on the link to the Form s Region property (and do it on the form event of course):

    // 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

I know the question was already answered, I would like to add an alternative and silly BUT a not really recommended practice since your question does not restrict the answer into being codes...

Create a blank, square image with your background color as fill, then erase the top-left rounded corners to be transparent, repeat this to all corners
Set a very unlikely color as your form background color
Set this color as the TransparencyKey on your form
Add the images as PictureBox and put them to the corresponding corners

Viola!

Answer 3

    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();
    }

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