Triggering a checkbox value changed event in DataGridView

Question

I have a grid view that has a check box column  and I want to trigger a drawing event as soon as the value of the cell is toggled  I tried the ValueChaged and the CellEndEdit and BeginEdit  and chose the selection mode as CellSelect  As for the the first 2 events  the event was triggered upon the finishing of the edit mode  like moving out of the current cell  or going back and forth  It s just a weird behavior    Is there anything that triggers the event on the grid view as soon as the cell value is changed

User · Answer

cellEndEditTimer Start     this line makes the datagridview update the list of checked boxes  Thank you

User · Answer

Another way is to handle the CellContentClick event  which doesn t give you the current value in the cell s Value property   call grid CommitEdit DataGridViewDataErrorContexts Commit  to update the value which in turn will fire CellValueChanged where you can then get the actual  i e  correct  DataGridViewCheckBoxColumn value   private void grid CellContentClick object sender  DataGridViewCellEventArgs e       grid CommitEdit DataGridViewDataErrorContexts Commit      private void grid CellValueChanged object sender  DataGridViewCellEventArgs e           do something with grid Rows e RowIndex  Cells e ColumnIndex  Value     Target  NET framework  2 0

User · Answer

Small update     Make sure you use EditedFormattedValue instead of value as I tried value but it never give right status that is checked unchecked most of the site still use value but as used in latest c  2010 express below is one way to access    grdJobDetails Rows e RowIndex  Cells 0  EditedFormattedValue   Also  CellValueChanged event suggested or used by few must be usable for some cases but if you are looking for every check uncheck of cell make sure you use  CellContentClick else per my notice I see not every time  CellValueChanged is fired   that is if the same checkbox is clicked over  amp  over again it does not fire  CellValueChanged but if you click alternately for example you have two chekbox  amp  click one after other  CellValueChanged event will be fired but usually if looking for event to fire everytime the any cell is check uncheck  CellValueChanged is not fired

User · Answer

I had the same issue  but came up with a different solution   If you make the column or the whole grid  Read Only  so that when the user clicks the checkbox it doesn t change value   Fortunately  the DataGridView CellClick event is still fired  In my case I do the following in the cellClick event   if  jM jobTasksDataGridView Columns e ColumnIndex  CellType Name     DataGridViewCheckBoxCell     But you could check the column name if you have more than one checkbox column   I then do all the modification   saving of the dataset myself

User · Answer

Try hooking into the CellContentClick event  The DataGridViewCellEventArgs will have a ColumnIndex and a RowIndex so you can know if a ChecboxCell was in fact clicked  The good thing about this event is that it will only fire if the actual checkbox itself was clicked  If you click on the white area of the cell around the checkbox  it won t fire  This way  you re pretty much guaranteed that the checkbox value was changed when this event fires  You can then call Invalidate   to trigger your drawing event  as well as a call to EndEdit   to trigger the end of the row s editing if you need that

User · Answer

I finally implemented it this way    private void dataGridView1 CellMouseClick object sender  DataGridViewCellMouseEventArgs e                 if  e ColumnIndex  gt   0  amp  amp  e RowIndex  gt   0                        if  dataGridView1 e ColumnIndex  e RowIndex  GetContentBounds e RowIndex  Contains e Location                                 cellEndEditTimer Start                                        private void dataGridView1 CellEndEdit object sender  DataGridViewCellEventArgs e          place your code here          private void cellEndEditTimer Tick object sender  EventArgs e                dataGridView1 EndEdit            cellEndEditTimer Stop

User · Answer

Using the  EditedFormattedValue property solves the problem  To be notified each time a checkbox in a cell toggles a value when clicked  you can use the CellContentClick event and access the preliminary cell value  EditedFormattedValue    As the event is fired the  EditedFormattedValue is not yet applied visually to the checkbox and not yet committed to the  Value property   private void dataGridView1 CellContentClick object sender  DataGridViewCellEventArgs e       var checkbox   dataGridView1 CurrentCell as DataGridViewCheckBoxCell      bool isChecked    bool checkbox EditedFormattedValue       The event fires on each Click and the  EditedFormattedValue toggles

User · Answer

A colleague of mine recommends trapping the CurrentCellDirtyStateChanged event  See http   msdn microsoft com en-us library system windows forms datagridview currentcelldirtystatechanged aspx

User · Answer

Every one of the CellClick and CellMouseClick answers is wrong  because you can change the value of the cell with the keyboard and the event will not fire  Additionally  CurrentCellDirtyStateChanged only fires once  which means if you check uncheck the same box multiple times  you will only get one event  Combining a few of the answers above gives the following simple solution   private void dgvList CurrentCellDirtyStateChanged object sender  EventArgs e        if  dgvList CurrentCell is DataGridViewCheckBoxCell          dgvList CommitEdit DataGridViewDataErrorContexts Commit      private void dgvList CellValueChanged object sender  DataGridViewCellEventArgs e           Now this will fire immediately when a check box cell is changed         regardless of whether the user uses the mouse  keyboard  or touchscreen                Value property is up to date  you DO NOT need EditedFormattedValue here

User · Answer

I found a combination of the first two answers gave me what I needed  I used the CurrentCellDirtyStateChanged event and inspected the EditedFormattedValue   private void dgv CurrentCellDirtyStateChanged object sender  EventArgs e       DataGridView dgv    DataGridView sender     DataGridViewCell cell   dgv CurrentCell     if  cell RowIndex  gt   0  amp  amp  cell ColumnIndex    3     My checkbox column                   If checkbox checked  copy value from col 1 to col 2         if  dgv Rows cell RowIndex  Cells cell ColumnIndex  EditedFormattedValue    null  amp  amp  dgv Rows cell RowIndex  Cells cell ColumnIndex  EditedFormattedValue Equals true                        dgv Rows cell RowIndex  Cells 1  Value   dgv Rows cell RowIndex  Cells 2  Value

User · Answer

I use the CellContentClick event  which makes sure the user clicked the checkbox   It DOES fire multiple times even if the user stays in the same cell   The one issue is that the Value does not get updated  and always returns  false  for unchecked   The trick is to use the  EditedFormattedValue property of the cell instead of the Value property   The EditedFormattedValue will track with the check mark and is what one wishes the Value had in it when the CellContentClick is fired   No need for a timer  no need for any fancy stuff  just use CellContentClick event and inspect the EditedFormattedValue to tell what state the checkbox is going into   just went into   If EditedFormattedValue   true  the checkbox is getting checked

User · Answer

Working with an unbound control  ie I manage the content programmatically   without the EndEdit   it only called the CurrentCellDirtyStateChanged once and then never again  but I found that with the EndEdit   CurrentCellDirtyStateChanged was called twice  the second probably caused by the EndEdit   but I didn t check   so I did the following  which worked best for me       bool myGridView DoCheck   false      private void myGridView CurrentCellDirtyStateChanged object sender  EventArgs e                if   myGridView DoCheck                        myGridView DoCheck   true              myGridView EndEdit                   do something here                   else             myGridView DoCheck   false

User · Answer

Use this code  when you want to use the checkedChanged event in DataGrid View   private void grdBill CellContentClick object sender  DataGridViewCellEventArgs e        grdBill CurrentCell    grdBill Rows grdBill CurrentRow Index  Cells  gBillNumber       private void grdBill CellEndEdit object sender  DataGridViewCellEventArgs e        calcBill       private void calcBill         listBox1 Items Clear        for  int i   0  i  lt  grdBill Rows Count - 1  i                  if  Convert ToBoolean grdBill Rows i  Cells  gCheck   Value     true                        listBox1 Items Add grdBill Rows i  Cells  gBillNumber   Value ToString                         Here  grdBill   DataGridView1  gCheck   CheckBox in GridView First Column   gBillNumber   TextBox in Grid  Second column    So  when we want to fire checkchanged event for each click  first do the CellContentClick it will get fire when user clicked the Text box  then it will move the current cell to next column  so the CellEndEdit column will get fire  it will check the whether the checkbox is checked and add the  gBillNumber  in list box  in function calcBill

User · Answer

EditingControlShowing  event doesn t fire on checkbox value change  Because display style of the checkbox cell doesn t not change   The workaround i have used is as below   I have used CellContentClick event       private void gGridView1 CellContentClick object sender  DataGridViewCellEventArgs e                if  string Compare gGridView1 CurrentCell OwningColumn Name   CheckBoxColumn      0                        bool checkBoxStatus   Convert ToBoolean gGridView1 CurrentCell EditedFormattedValue                 checkBoxStatus gives you whether checkbox cell value of selected row for the                CheckBoxColumn  column value is checked or not               if checkBoxStatus                                  write your code                           else                                write your code                                 The above has worked for me  Please let me know if need more help

User · Answer

I found a simple solution   Just change the cell focus after click on cell   private void DGV CellContentClick object sender  DataGridViewCellEventArgs e        if  e ColumnIndex     Here checkbox column id or name             DGV Item e ColumnIndex  e RowIndex   1  Selected   true            Here your code            Don t forget to check if the column of your  ckeckbox   1  index exist

[c#] Triggering a checkbox value changed event in DataGridView

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