c# - 如何在 c# 中圆角按钮的角？

Question

我需要圆角现有按钮，而不是在我的 Windows 窗体应用程序中创建新的圆角按钮。我该怎么做。我只能从互联网上找到新创建的按钮代码。

标签： c#button

Answer 1

抢救旧帖子，您可以编写这个简单的函数来将舍入应用于现有Button或其他控件..：

void makeRound(Control ctl, int radius)
{
    ctl.Paint += (s, e) =>
    {
        RectangleF Rect = new RectangleF(0, 0, ctl.Width, ctl.Height);
        GraphicsPath GraphPath = GetRoundPath(Rect, 20);

        ctl.Region = new Region(GraphPath);
        using (Pen pen = new Pen(Color.CadetBlue, 1.75f))
        {
            pen.Alignment = PenAlignment.Inset;
            e.Graphics.DrawPath(pen, GraphPath);
        }
    };
}

GraphicsPath GetRoundPath(RectangleF Rect, int radius)
{
    float r2 = radius / 2f;
    GraphicsPath GraphPath = new GraphicsPath();

    GraphPath.AddArc(Rect.X, Rect.Y, radius, radius, 180, 90);
    GraphPath.AddLine(Rect.X + r2, Rect.Y, Rect.Width - r2, Rect.Y);
    GraphPath.AddArc(Rect.X + Rect.Width - radius, Rect.Y, radius, radius, 270, 90);
    GraphPath.AddLine(Rect.Width, Rect.Y + r2, Rect.Width, Rect.Height - r2);
    GraphPath.AddArc(Rect.X + Rect.Width - radius, 
                    Rect.Y + Rect.Height - radius, radius, radius, 0, 90);
    GraphPath.AddLine(Rect.Width - r2, Rect.Height, Rect.X + r2, Rect.Height);
    GraphPath.AddArc(Rect.X, Rect.Y + Rect.Height - radius, radius, radius, 90, 90);
    GraphPath.AddLine(Rect.X, Rect.Height - r2, Rect.X, Rect.Y + r2);

    GraphPath.CloseFigure();
    return GraphPath;
}

Region将不允许抗锯齿，因此在圆形边缘周围看起来有点粗糙。