.net c# winform单张图片浏览,保存

winform项目中,有时需要浏览图片,图片的大小无法确定,就需要根据情况来动态显示.分为网络图片和本地图片

1.网络图片,需要加载图片信息

        /// <summary>
        /// 加载网络图片
        /// </summary>
        /// <param name="url"></param>
        public fImgView(string url)
        {
            InitializeComponent();
            this.zImage.ImageLocation = url;
            this.zImage.LoadCompleted += (o, e) =>
            {
                if (e.Error != null || e.Cancelled) return;
                var img = this.zImage.Image;
                FormRender(img);
            };
        }

2.本地图片,可直接获取图片信息

        /// <summary>
        /// 本地图片
        /// </summary>
        /// <param name="img"></param>
        /// <param name="name"></param>
        public fImgView(Image img, string name)
        {
            InitializeComponent();
            this.zImage.Image = img;
            FormRender(img);
            this.zSave.FileName = name;
            if (!string.IsNullOrEmpty(this.zSave.DefaultExt)) this.zSave.Filter = "图像文件(." + this.zSave.DefaultExt + ")|*." + this.zSave.DefaultExt;
        }

制作图片浏览器的窗体

1.绘制窗体如下,一个Panel放一个PictureBox

编写鼠标触发事件

        private void zImage_MouseDown(object sender, MouseEventArgs e)
        {
            pm = System.Windows.Forms.Cursor.Position;
            pi = this.zImage.Location;
            this.zImage.MouseMove += new MouseEventHandler(zImage_MouseMove);
        }

        void zImage_MouseMove(object sender, MouseEventArgs e)
        {
            this.zImage.Location = new Point(pi.X + System.Windows.Forms.Cursor.Position.X - pm.X, pi.Y + System.Windows.Forms.Cursor.Position.Y - pm.Y);
        }

        private void zImage_MouseUp(object sender, MouseEventArgs e)
        {
            this.zImage.MouseMove -= zImage_MouseMove;
        }

实现效果如下,代码虽然少,但整整弄了4天才完善.