C#实现将图片设置成圆形形式显示

首先在form中添加一个控件，然后将控件的背景backcolor设置成透明

、

 

 然后分别设置控件的image： image image = image.fromfile(userlogininfor.logininfor.userico);

获取image的width、height：width= image.width、height=image.height

 然后实现该功能，具体代码如下：（picturebox1：控件的名称）

image image = image.fromfile(userlogininfor.logininfor.userico);
this.picturebox1.image = cutellipse(image.fromfile(userlogininfor.logininfor.userico), new rectangle(0, 0,image .width, image .height), new size(image .width, image .height));

最后创建一个自定义方法cutellipse：

 private image cutellipse(image img, rectangle rec, size size)
        {
            bitmap bitmap = new bitmap(size.width, size.height);
            using (graphics g = graphics.fromimage(bitmap))
            {
                using (texturebrush br = new texturebrush(img, system.drawing.drawing2d.wrapmode.clamp, rec))
                {
                    br.scaletransform(bitmap.width / (float)rec.width, bitmap.height / (float)rec.height);
                    g.smoothingmode = system.drawing.drawing2d.smoothingmode.highquality;
                    g.fillellipse(br, new rectangle(point.empty, size));
                }
            }
            return bitmap;
        }

参考网址：https://q.cnblogs.com/q/11565/