Overwrite image picturebox in C#

by

This is a common issue.

The documentation says:

Saving the image to the same file it was constructed from is not
allowed and throws an exception.

There are two options. One is to delete the file before writing it.

The other is to use a Stream to write it. I prefer the latter..:

string fn = "d:\\xyz.jpg";

// read image file
Image oldImg = Image.FromFile(fn);

// do something (optional ;-)
((Bitmap)oldImg).SetResolution(123, 234);

// save to a memorystream
MemoryStream ms = new MemoryStream();
oldImg.Save(ms, ImageFormat.Jpeg);

// dispose old image
oldImg.Dispose();

// save new image to same filename
Image newImage = Image.FromStream(ms);
newImage.Save(fn);

Note that saving jpeg files often achieves better quality if you take control of encoding options. Use this overload for this..

Also note that since we need to dispose of the image you need to make sure that it is not used anywhere, like in a PictureBox.Image! If it is, set it to null there before disposing : pictureBox1.Image = null; !

For a solution deleting the old file see here

More Related Contents:

  1. Color a specific word in a long text in c# [closed]
  2. Convert JSON to DataTable
  3. The foreach identifier and closures
  4. How to deserialize xml to object [duplicate]
  5. Add new item in existing array in c#.net
  6. How to know if a DateTime is between a DateRange in C#
  7. Changing the user agent of the WebBrowser control
  8. Is there a way to force all referenced assemblies to be loaded into the app domain?
  9. ModelState.IsValid == false, why?
  10. What does it mean for a property to be [Required] and nullable?
  11. simple custom event
  12. Characters in string changed after downloading HTML from the internet
  13. Reading embedded XML file c#
  14. Breakpoint Failed to Bind – Visual Studio 2015
  15. Complex models and partial views – model binding issue in ASP.NET MVC 3
  16. Deserializing heterogenous JSON array into covariant List using Json.NET
  17. How does creating a instance of class inside of the class itself works?
  18. Sending a value from server to client with sockets
  19. How to access form methods and controls from a class in C#?
  20. Why are C# interface methods not declared abstract or virtual?
  21. A pattern for self-cancelling and restarting task
  22. Checking for empty or null JToken in a JObject
  23. What does the @ prefix do on string literals in C#
  24. Check well-formed XML without a try/catch?
  25. Select all columns after JOIN in LINQ
  26. No IUserTokenProvider is registered
  27. C# Converting 20 digit precision double to string and back again
  28. Why can’t I do foreach (var Item in DataTable.Rows)?
  29. a constructor as a delegate – is it possible in C#?
  30. difference between http.context.user and thread.currentprincipal and when to use them?

Leave a Comment