c#imge设置圆角

以下是在C#中设置图片圆角的示例代码：

private void SetRoundedPictureBox(PictureBox pictureBox, int radius)
{
    Bitmap bitmap = new Bitmap(pictureBox.Width, pictureBox.Height);
    Graphics graphics = Graphics.FromImage(bitmap);
    graphics.SmoothingMode = SmoothingMode.AntiAlias;
    using (var brush = new TextureBrush(pictureBox.Image))
    {
        using (var path = GetRoundedPath(pictureBox.ClientRectangle, radius))
        {
            graphics.FillPath(brush, path);
        }
    }
    pictureBox.Image = bitmap;
}

private GraphicsPath GetRoundedPath(Rectangle rectangle, int radius)
{
    GraphicsPath path = new GraphicsPath();
    path.StartFigure();
    path.AddArc(rectangle.X, rectangle.Y, radius * 2, radius * 2, 180, 90);
    path.AddLine(rectangle.X + radius, rectangle.Y, rectangle.Right - radius * 2, rectangle.Y);
    path.AddArc(rectangle.X + rectangle.Width - radius * 2, rectangle.Y, radius * 2, radius * 2, 270, 90);
    path.AddLine(rectangle.Right, rectangle.Y + radius * 2, rectangle.Right, rectangle.Y + rectangle.Height - radius * 2);
    path.AddArc(rectangle.X + rectangle.Width - radius * 2, rectangle.Y + rectangle.Height - radius * 2, radius * 2, radius * 2, 0, 90);
    path.AddLine(rectangle.Right - radius * 2, rectangle.Bottom, rectangle.X + radius * 2, rectangle.Bottom);
    path.AddArc(rectangle.X, rectangle.Y + rectangle.Height - radius * 2, radius * 2, radius * 2, 90, 90);
    path.AddLine(rectangle.X, rectangle.Bottom - radius * 2, rectangle.X, rectangle.Y + radius * 2);
    path.CloseFigure();
    return path;
}

其中，SetRoundedPictureBox方法用于设置PictureBox控件的圆角，需要传入PictureBox控件和圆角半径两个参数。GetRoundedPath方法用于获取圆角路径，需要传入控件的矩形和圆角半径两个参数。

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