C# WinFormImage

using System.Drawing;
using System.IO;
using System.Text.RegularExpressions;
using System.Windows.Forms;

namespace WinFormImage
{
    public partial class FormImage : Form
    {
        private OpenFileDialog openFile;
        private PictureBox picture;

        public FormImage()
        {
            InitializeComponent();
            openFile = new OpenFileDialog();
            openFile.Filter = "ImageFormat (*.BMP;*.GIF;*.JPG;*.PNG)|*.bmp;*.gif;*.jpg;*.png";
            openFile.Multiselect = false;
            picture = new PictureBox();
            picture.Dock = DockStyle.Fill;
            picture.SizeMode = PictureBoxSizeMode.Zoom;
            this.Controls.Add(picture);
            this.AllowDrop = true;
            this.HelpButton = true;
            this.MaximizeBox = this.MinimizeBox = false;
            this.StartPosition = FormStartPosition.CenterScreen;
        }

        #region OnDragEnter
        protected override void OnDragEnter(DragEventArgs e)
        {
            base.OnDragEnter(e);
            this.Activate(); // 激活窗体并给予它焦点。
            DataObject data = e.Data as DataObject;
            if (data.ContainsFileDropList())
            {
                string filePath = data.GetFileDropList()[0];
                if (Regex.IsMatch(Path.GetExtension(filePath), @".(bmp|gif|jpg|png)", RegexOptions.IgnoreCase)) // 指定不区分大小写的匹配。
                {
                    picture.Image = Image.FromFile(filePath);
                    //picture.ImageLocation = filePath;
                    //using (MemoryStream ms = new MemoryStream(File.ReadAllBytes(filePath)))
                    //{
                    //    picture.Image = Image.FromStream(ms);
                    //}
                    //using (Stream ms = new System.Data.SqlTypes.SqlBytes(File.ReadAllBytes(filePath)).Stream)
                    //{
                    //    picture.Image = Image.FromStream(ms);
                    //}
                }
            }
        }
        #endregion

        #region OnHelpButtonClicked
        protected override void OnHelpButtonClicked(System.ComponentModel.CancelEventArgs e)
        {
            base.OnHelpButtonClicked(e);
            e.Cancel = true;
            if (openFile.ShowDialog(this) == DialogResult.OK)
            {
                picture.Image = Image.FromFile(openFile.FileName);
                //picture.ImageLocation = openFile.FileName;
                //using (MemoryStream ms = new MemoryStream(File.ReadAllBytes(openFile.FileName)))
                //{
                //    picture.Image = Image.FromStream(ms);
                //}
                //using (Stream ms = new System.Data.SqlTypes.SqlBytes(File.ReadAllBytes(openFile.FileName)).Stream)
                //{
                //    picture.Image = Image.FromStream(ms);
                //}
            }
        }
        #endregion
    }
}

 

WebForm Image:
Response.ContentType = FileUpload.PostedFile.ContentType;

Response.BinaryWrite(FileUpload.FileBytes);

using (Stream os = Response.OutputStream)
{
os.Write(FileUpload.FileBytes, 0, FileUpload.PostedFile.ContentLength);
os.Flush();
}

Clipboard Image:
if (openFile.ShowDialog(this) == DialogResult.OK)
{
    IDataObject data = Clipboard.GetDataObject();
    using (Bitmap bmp = new Bitmap(openFile.FileName))
    {
        Clipboard.SetImage(bmp);
        if (Clipboard.ContainsImage())
            picture.Image = Clipboard.GetImage();
    }
    Clipboard.SetDataObject(data, true);
}