C#實現將圖片設置成圓形形式顯示

首先在Form中添加一個控制項，然後將控制項的背景BackColor設置成透明

、

 然後分別設置控制項的Image： Image image = Image.FromFile(UserLoginInfor.LoginInfor.userIco);

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

 然後實現該功能，具體代碼如下：（pictureBox1：控制項的名稱）

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));

最後創建一個自定義方法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;
        }

參考網址：https://q.cnblogs.com/q/11565/