使用FileStream或Simple Bitmap在c＃中更新后未保存图像

Question

I am working for a utility in desktop application, related to some graphics work.

I have to load small thumbnails and full sized bitmap.I am doing this using this code.

 FileStream fs = new FileStream("myphoto.jpg", FileMode.Open);
 Image imgPhoto = Image.FromStream(fs);
 fs.Close();
 PictureBox p = new PictureBox();
 p.Name = "p1";
 p.Image = imgPhoto;
 flowPanel.Controls.Add(p);
 //---- 
 FileStream fs = new FileStream("myphoto_thumb.jpg", FileMode.Open);
 Image img = Image.FromStream(fs);
 fs.Close();
 Button b_thumb = new Button();
 b_thumb.Name = "thumb1";
 b_thumb.BackgroundImage = img;
 flowBottom.Controls.Add(b_thumb);

After this, i need to add some effects on image of this picturebox.When i add some effect to main (big) image in picturebox, i also add the same effect in botton background image.When i save this thumbnail image to existing thumbnail image it is saving, but when i save the big image from picturebox on the existing file "myphoto.jpg", it gives me error like FILE IS BEING USED BY ANOTHER PROCESS

//---- Add some Effects to image of Picturebox ---- //
PictureBox tempPic = flowPanel.Controls["p1"];
tempPic.Image.Save("myphoto.jpg",ImageFormat.Jpeg);

I have found many solutions on google and on stackoverflow but could not find helpful. If any good solution, plz help. May be its very simple but i have tried more than 10 hours but failed.

Answer 1

You don't close the FileStream you open. I always wrap this kind of stuff in a using construction, so it automatically gets destructed, thus closes:

using (FileStream fs = new FileStream("myphoto.jpg", FileMode.Open)) {
  // Do stuff
}

tempPic.Image.Save("myphoto.jpg",ImageFormat.Jpeg);

Answer 2

Try setting your filestream to read only:

fs = New System.IO.FileStream("myphoto.jpg", 
     IO.FileMode.Open, IO.FileAccess.Read)

This is Microsoft's recommendation, targeted at users who try Image.FromFile and it locks the file: http://support.microsoft.com/kb/309482