Winform下的Datagrid的列风格(2)—DataGridTextBindColumn

class DataGridTextBindColumn:DataGridColumnStyle
    {
        private DataView ChoiceDataViewSource;
        private string ChoiceDisplayField;
        private string ChoiceValueField;
        public DataGridTextBindColumn(DataView ChoiceDataViewSource,string ChoiceDisplayField,string ChoiceValueField) : base() 
        {
            this.ChoiceDataViewSource =ChoiceDataViewSource;
            this.ChoiceDisplayField =ChoiceDisplayField;
            this.ChoiceValueField =ChoiceValueField;
        }
        protected override void Abort(int rowNum)
        {
            Invalidate();
        }

        protected override bool Commit
            (CurrencyManager dataSource, int rowNum) 
        {
            Invalidate();
            return true;
        }

        protected override void Edit(
            CurrencyManager source, 
            int rowNum,
            Rectangle bounds, 
            bool readOnly,
            string instantText, 
            bool cellIsVisible) 
        {

        }
        protected int Find(System.Object value)
        {
            int int1;
            int int2;
            
            int2=ChoiceDataViewSource.Count ;
            if (int2<=0)
            {
                return -1;
            }
            for (int1=0;int1<int2;int1++)
            {
                if (ChoiceDataViewSource[int1][ChoiceValueField ].ToString ().Trim ()==value.ToString ().Trim ())
                {
                    return int1;
                }
            }
            return -1;
        }

        protected override Size GetPreferredSize(
            Graphics g, 
            object value) 
        {
            return new Size(100,  4);
        }

        protected override int GetMinimumHeight() 
        {
            return  4;
        }

        protected override int GetPreferredHeight(Graphics g, 
            object value) 
        {
            return  4;
        }

        protected override void Paint(Graphics g, 
            Rectangle bounds, 
            CurrencyManager source, 
            int rowNum) 
        {
            Paint(g, bounds, source, rowNum, false);
        }
        protected override void Paint(
            Graphics g, 
            Rectangle bounds,
            CurrencyManager source, 
            int rowNum,
            bool alignToRight) 
        {
            Paint(
                g,bounds, 
                source, 
                rowNum, 
                Brushes.Red, 
                Brushes.Blue, 
                alignToRight);
        }
        protected override void Paint(
            Graphics g, 
            Rectangle bounds,
            CurrencyManager source, 
            int rowNum,
            Brush backBrush, 
            Brush foreBrush,
            bool alignToRight) 
        {
            object value=GetColumnValueAtRow(source, rowNum);
            int int1=Find (value);
            string display="";
            if (int1>=0)
            {
                display=this.ChoiceDataViewSource [int1][ChoiceDisplayField].ToString ();
            }
            Rectangle rect = bounds;
            g.FillRectangle(backBrush,rect);
            rect.Offset(0, 2);
            rect.Height -= 2;
            g.DrawString(display, 
                this.DataGridTableStyle.DataGrid.Font, 
                foreBrush, rect);
        }

        protected override void SetDataGridInColumn(DataGrid value) 
        {

        }

    }

        与DataGridComboBoxColumn的不同之处就是只显示学生所属的班级名称，但不能更改学生所属班级。一般情况在datagrid中要将此DataGridTextBindColumn列的readonly设为true。