C# 中如何是PictureBox 按比例的缩放加载图片

http://www.cnblogs.com/chenleiustc/archive/2009/07/21/1527676.html

方法一：

    如果要加载的图片的长宽比不是太过失衡，可以改变picturebox的SizeMode属性为 PictureBoxSizeMode.StretchImage。这样加载到picturebox的图片会充满整个picturebox。但是 当图片长宽比比较大时，这个方法显得不是太好了。可以选择方法二。

方法二：

可参考; http://www.cnblogs.com/fengzanfeng/articles/1339107.html

           OpenFileDialog ofdPic= new OpenFileDialog();

            ofdPic.Filter = "JPG(*.JPG;*.JPEG);gif文件(*.GIF)|*.jpg;*.jpeg;*.gif";

            ofdPic.FilterIndex = 1;

            ofdPic.FileName = "";

            if (ofdPic.ShowDialog() == DialogResult.OK)

            {

                string sPicPaht = ofdPic.FileName.ToString();

                Bitmap bmPic = new Bitmap(sPicPaht);

                Point ptLoction = new Point(bmPic.Size);

                    if (ptLoction.X > mypicbox.Size.Width || ptLoction.Y > mypicbox.Size.Height)

                    {

                        //圖像框的停靠方式  

                        //pcbPic.Dock = DockStyle.Fill;  

                        //圖像充滿圖像框，並且圖像維持比例  

                        mypicbox.SizeMode = PictureBoxSizeMode.Zoom;

                    }

                    else

                    {

                        //圖像在圖像框置中  

                        mypicbox.SizeMode = PictureBoxSizeMode.CenterImage;

                    }

                //LoadAsync：非同步載入圖像  

                mypicbox.LoadAsync(sPicPaht);

           }

分类: c#winform