c# - Can DataGridViewCheckBoxCell accept CheckState.Indeterminate programatically, but not via clicking? -

i have followowing datagridviewcheckboxcell part of datagridview:

datagridviewcheckboxcell cell = new datagridviewcheckboxcell(true) {value = checkstate.unchecked}; grdrow.cells.add(cell); grdrow.tag = key; grdfilter.rows.add(grdrow); 

later on, update state based on whether other check boxes checked.

var numchecked = cells.count(c => c.value.equals(true)); cbcell.value = (numchecked == cells.count) ? checkstate.checked : (numchecked == 0 ? checkstate.unchecked : checkstate.indeterminate); 

this works great. however, if user clicks checkbox, cycles between checked, unchecked, , indeterminate. want cycle between checked , unchecked.

if set tristate false on cell, no longer allows me set value checkstate.indeterminate.

is there way behavior want?

update:

i've tried trapping cellvaluechanged event so:

void datagridview_cellvaluechanged(object sender, datagridviewcelleventargs e) {     var changedcell = grdfilter.rows[e.rowindex].cells[e.columnindex];     if(changedcell.value.equals(checkstate.indeterminate))         changedcell.value = checkstate.unchecked; } 

however, has no effect. can still click through 3 states. i've verified event fire under debugger, , value property indeed getting set checkstate.unchecked.

the cellvaluechanged event think firing late catch user changing value checkbox column. try wiring currentcelldirtystatechanged event , commit change:

void dgv_currentcelldirtystatechanged(object sender, eventargs e) {     dgv.commitedit(datagridviewdataerrorcontexts.commit); } 

then in cellvaluechanged event, can change threestate property:

private void dgv_cellvaluechanged(object sender, datagridviewcelleventargs e) {   ((datagridviewcheckboxcell)dgv.rows[e.rowindex].cells[e.columnindex]).threestate = false; } 

you should filter columns on checkbox columns, etc.