带有自定义边框和圆边的C#表单

Question

我正在使用此代码来创建带有圆边的表单(FormBorderStyle = none):

[DllImport("Gdi32.dll", EntryPoint = "CreateRoundRectRgn")]
private static extern IntPtr CreateRoundRectRgn
(
    int nLeftRect, // x-coordinate of upper-left corner
    int nTopRect, // y-coordinate of upper-left corner
    int nRightRect, // x-coordinate of lower-right corner
    int nBottomRect, // y-coordinate of lower-right corner
    int nWidthEllipse, // height of ellipse
    int nHeightEllipse // width of ellipse
 );

public Form1()
{
    InitializeComponent();
    Region = System.Drawing.Region.FromHrgn(CreateRoundRectRgn(0, 0, Width, Height, 20, 20));
}

这是在Paint事件上设置自定义边框:

    ControlPaint.DrawBorder(e.Graphics, this.ClientRectangle, Color.Black, 5, ButtonBorderStyle.Solid, Color.Black, 5, ButtonBorderStyle.Solid, Color.Black, 5, ButtonBorderStyle.Solid, Color.Black, 5, ButtonBorderStyle.Solid);

但看到这个 .

内部形式矩形没有圆角.

如何使蓝色内部形式矩形也具有圆形边缘,所以它看起来不像截图？

Answer 1

地区的特色只是切断角落.要拥有真正的圆角,您必须绘制圆角矩形.

绘制圆角矩形

绘制所需形状的图像并将其放在透明表格上可能更容易.更容易绘制但无法调整大小.