WinForm控件之【PictureBox】

基本介绍

图片控件，用于显示各种格式图像。

常设置属性

Image：在控件中显示的图像，绑定需要显示的Image类型对象；

ErrorImage：当加载图像失败时显示的图像对象；

InitialImage：正在加载另一图像时显示的图像对象；

SizeMode：控件如何展示图片的类型；

Enabled：指示是否启用该控件，true为启用状态用户可编辑，false为禁用状态用户不可编辑；

Name：指示代码中用来标识该对象的名称；

事例举例

相关代码

       #region 控件文件拖拽获取事件
        private void img_data_DragDrop(object sender, DragEventArgs e)
        {
            //获取所有拖拽文件路劲
            System.Array array = (System.Array)e.Data.GetData(DataFormats.FileDrop);
            int index = array.Length;
            for (int i = 0; i < index; i++)
            {
                listPath.Add(array.GetValue(i).ToString());
            }

            if (listPath.Count > 0)
            {
                BindImgData(listPath[0], 1);
            }
        }

        private void img_data_DragEnter(object sender, DragEventArgs e)
        {
            if (e.Data.GetDataPresent(DataFormats.FileDrop))
            {
                e.Effect = DragDropEffects.Link;
            }
            else
            {
                e.Effect = DragDropEffects.None;
            }
        }

        /// <summary>
        /// 图片绑定
        /// </summary>
        /// <param name="path"></param>
        /// <param name="page"></param>
        private void BindImgData(string path, int page)
        {
            try
            {

                sbtn_Prev.Enabled = true;
                sbtn_Next.Enabled = true;

                if (page == 1) { sbtn_Prev.Enabled = false; }
                if (page == listPath.Count) { sbtn_Next.Enabled = false; }


                fileExtension = Path.GetExtension(path).ToLower();
                fileName = Path.GetFileName(path);
                sbtn_Pages.Text = page + "/" + listPath.Count;

                if (path.Contains("http://") || path.Contains("https://"))
                {
                    picObj = Bitmap.FromStream(new System.IO.MemoryStream((new System.Net.WebClient()).DownloadData(path)));
                }
                else
                {
                    picObj = Image.FromFile(path);
                }
            }
            catch (Exception ex)
            {
                picObj = null;
                sbtn_Pages.Text = "0";

                //string strNo = Helpers.UtilityHelper.GetSerialNumber();
                //Helpers.LogHelper.ErrorMsgRecord(this.Name, ex, strNo);
                //Helpers.LoadingHelper.CloseForm();
                //MessageBox.Show("图片对象或路径异常，显示失败！
" + ex.Message + strNo, "系统提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }

            img_data.Image = picObj;

        }

        #endregion       

        #region 鼠标移动图片
        bool dragFlag = false;
        int mouseX = 0, mouseY = 0;
        private void img_data_MouseDown(object sender, MouseEventArgs e)
        {
            mouseX = e.X;
            mouseY = e.Y;
            dragFlag = true;
        }

        private void img_data_MouseUp(object sender, MouseEventArgs e)
        {
            dragFlag = false;
        }

        private void img_data_MouseMove(object sender, MouseEventArgs e)
        {
            if (dragFlag)
            {
                img_data.Location = new Point(img_data.Location.X - (mouseX - e.X), img_data.Location.Y - (mouseY - e.Y));
            }
        }
        #endregion