剪贴板功能

if (Clipboard.ContainsImage())
 {
     Image img = Clipboard.GetImage();
     pictureBox1.Image = img;
 }

IDataObject data = Clipboard.GetDataObject();
 if (data.GetDataPresent(typeof(Bitmap)))
 {
     Image img = (Image)data.GetData(typeof(Bitmap));
     pictureBox1.Image = img;
 }

Image bmap;
IDataObject data =  Clipboard.GetDataObject();
bmap = (Image)(data.GetData(typeof(System.Drawing.Bitmap)));
Graphics g = Graphics.FromImage(bmap);

SolidBrush drawBrush = new SolidBrush(Color.Red);
Font drawFont = new Font("Arial", 10, FontStyle.Bold, GraphicsUnit.Millimeter);
int xPos = bmap.Height - (bmap.Height - 25);
int yPos = 3;

g.DrawString("我的水印", drawFont, drawBrush, xPos, yPos);

string sPreFix = "d://xxx";
bmap.Save(sPreFix + ".jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
bmap = null;