[DevExpress] Create a Checkbox in the GridControl column header

Key code:

/// <Summary> /// draw CheckBox for the column header // </summary> /// <param name = "view"> GridView </param> /// <param name = "checkItem"> RepositoryItemCheckEdit </param> /// <param name = "fieldName"> name of the Checkbox column to be drawn </param> /// <param name = "e"> ColumnHeaderCustomDrawEventArgs </param> public static void DrawHeaderCheckBox (this GridView view, repositoryItemCheckEdit checkItem, string fieldName, ColumnHeaderCustomDrawEventArgs e) {/* Description: * Reference: https://www.devexpress.com/Support/Center/Question/Details/Q354489 * Use ** eg: * private void gvCabChDetail_CustomDrawColumnHeader (object sender, DevExpress. xtraGrid. views. grid. columnHeaderCustomDrawEventArgs e) * {* GridView _ view = sender as GridView; * _ view. drawHeaderCheckBox (CheckItem, "Check", e); *} */if (e. column! = Null & e. column. fieldName. equals (fieldName) {e. info. innerElements. clear (); e. painter. drawObject (e. info); DrawCheckBox (checkItem, e. graphics, e. bounds, getCheckedCount (view, fieldName) = view. dataRowCount); e. handled = true ;}} private static void DrawCheckBox (checking checkItem, Graphics g, Rectangle r, bool Checked) {CheckEditViewInfo _ info; CheckEditPainter _ painter; ControlGraphicsInfoArgs _ args; _ info = checkItem. createViewInfo () as CheckEditViewInfo; _ painter = checkItem. createPainter () as CheckEditPainter; _ info. editValue = Checked; _ info. bounds = r; _ info. paintAppearance. foreColor = Color. black; _ info. calcViewInfo (g); _ args = new ControlGraphicsInfoArgs (_ info, new DevExpress. utils. drawing. graphicsCache (g), r); _ painter. draw (_ args); _ args. cache. dispose ();} private static int getCheckedCount (GridView view, string filedName) {int count = 0; for (int I = 0; I <view. dataRowCount; I ++) {object _ cellValue = view. getRowCellValue (I, view. columns [filedName]); if (_ cellValue = null) continue; if (string. isNullOrEmpty (_ cellValue. toString (). trim () continue; bool _ checkStatus = false; if (bool. tryParse (_ cellValue. toString (), out _ checkStatus) {if (_ checkStatus) count ++ ;}} return count ;}

Code usage:

        RepositoryItemCheckEdit CheckItem = new RepositoryItemCheckEdit();        const string gcCheckFieldName = "Checked";        private void gvLampConfig_CustomDrawColumnHeader(object sender, ColumnHeaderCustomDrawEventArgs e)        {            GridView _view = sender as GridView;            _view.DrawHeaderCheckBox(CheckItem, gcCheckFieldName, e);        }

Code effect:

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