Clear image on picturebox

Question

How can I clear draw image on picturebox  The following doesn t help me   pictbox Image   null  pictbox Invalidate      Please help   EDIT  private void pictbox Paint object sender  PaintEventArgs e           Graphics g   e Graphics        vl Draw g  ref tran realListForInsert        public void Draw Graphics g  ref List lt double gt  arr          g DrawRectangle new Pen Brushes Red  3   nodeArr Convert ToInt32 templstName   pict Location X  nodeArr Convert ToInt32 templstName   pict Location Y  25  25        g DrawRectangle new Pen Brushes Green  3   nodeArr Convert ToInt32 templstArgName   pict Location X  nodeArr Convert ToInt32 templstArgName   pict Location Y  25  25        nodeArr Convert ToInt32 templstName   text Text   arr Convert ToInt32 templstArgName   ToString         arr Convert ToInt32 templstName     arr Convert ToInt32 templstArgName

User · Answer

For the Sake of Understanding  Depending on how you re approaching your objective s   keep in mind that the developer is responsible to Dispose everything that is no longer being used or necessary  This means  Everything you ve created along with your pictureBox  i e  Graphics  List  etc  shall be disposed whenever it is no longer necessary  For Instance  Let s say you have a Image File Loaded into your PictureBox  and you wish to somehow Delete that file  If you don t unload the Image File from PictureBox correctly  you won t be able to delete the file  as this will likely throw an Exception saying that the file is being used  Therefore you d be required to do something like  pic PhotoDisplay Image Dispose    pic PhotoDisplay Image   null  pic PhotoDisplay ImageLocation   null     Required if you ve drawn something in the PictureBox  Just Don t forget to Dispose Graphic  pic PhotoDisplay Update        Depending on your approach  Dispose the Graphics with Something Like  gfx   null  gfx Clear    gfx Dispose     Hope this helps you out

User · Answer

if  pictureBox1 Image    null        pictureBox1 Image Dispose        pictureBox1 Image   null

User · Answer

I assume you want to clear the Images drawn via PictureBox   This you would be achieved via a Bitmap object and using Graphics object  you might be doing something like  Graphics graphic   Graphics FromImage pictbox Image   graphic Clear Color Red    Color to fill the background and reset the box   Is this what you were looking out   EDIT  Since you are using the paint method this would cause it to be redrawn every time  I would suggest you to set a flag at the formlevel indicating whether it should or not paint the Picturebox  private bool  shouldDraw   true  public bool ShouldDraw       get   return  shouldDraw        set    shouldDraw   value        In your paint just use   if ShouldDraw      do your stuff   When you click the button set this property to false and you should be fine

User · Answer

I used this method to clear the image from picturebox  It may help some one  private void btnClear1 Click object sender  EventArgs e                         img1 ImageLocation   null

User · Answer

I had to add a Refresh   statement after the Image   null to make things work

User · Answer

As others have said  setting the Image property to null should work   If it doesn t  it might mean that you used the InitialImage property to display your image  If that s indeed the case  try setting that property to null instead   pictBox InitialImage   null

User · Answer

Its so simple  You can go with your button click event  I used it with a button property Name   btnClearImage      Note 1a     after clearing the picture box     you can also disable clear button     by inserting follwoing one line of code   btnClearImage Enabled   false        Note 1b     you should set your button Enabled property    to  False     after that you will need to Insert     the following line to concerned event or button    that load your image into picturebox1     code line is as follows   btnClearImage Enabled   true

User · Answer

I ve had a stubborn image too  that wouldn t go away  by setting the Image and InitialImage to null  To remove the image from the pictureBox for good  I had to use the code below  by calling Application DoEvents   repeatedly               Application DoEvents                if   pictureBox Image    null                   pictureBox Image Dispose                 pictureBox Image   null              Application DoEvents                if   pictureBox InitialImage    null                   pictureBox InitialImage Dispose                 pictureBox InitialImage   null               pictureBox Update                Application DoEvents                 pictureBox Refresh

User · Answer

Setting the Image property to null will work just fine  It will clear whatever image is currently displayed in the picture box  Make sure that you ve written the code exactly like this   picBox Image   null

User · Answer

private void ClearBtn Click object sender  EventArgs e        Studentpicture Image   null

User · Answer

You need the following   pictbox Image   null  pictbox update

User · Answer

You should try  When you clear your Graphics you must choose color  SystemColors Control is native color of form  Graphics g   pB CreateGraphics    g Clear SystemColors Control

User · Answer

clear pictureBox in c  winform Application Simple way to clear pictureBox in c  winform Application

[c#] Clear image on picturebox

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