设置DataGrid(WinForm)中行的背景色

 前一阵子在一个项目中用到了这个技巧,这是网上搜来的,感觉很不错

    {
        //使用DataGridTableStyle 显示DataGrid.

        DataGridTableStyle tableStyle = new DataGridTableStyle();
        tableStyle.MappingName = "customers";

        int numCols = _dataSet.Tables["customers"].Columns.Count;
        DataGridCellColorTextBoxColumn columnTextColumn ;
        for(int i = 0; i < numCols; ++i)
        {
            columnTextColumn = new DataGridCellColorTextBoxColumn();
            columnTextColumn.HeaderText = _dataSet.Tables["customers"].Columns[i].ColumnName;
            columnTextColumn.MappingName = _dataSet.Tables["customers"].Columns[i].ColumnName;

            //为每个单元格建立设置背景色的事件.
            columnTextColumn.CheckCellColor += new CellColorEventHandler(SetColorValues);

            tableStyle.GridColumnStyles.Add(columnTextColumn);
        }

        dataGrid1.TableStyles.Clear();
        dataGrid1.TableStyles.Add(tableStyle);

        dataGrid1.DataSource = _dataSet.Tables["customers"];

    }



    public void SetColorValues(object sender, DataGridCellColorEventArgs e)
    {
        //根据条件, 将相关行设置不同的背景色.
        //下例为国家(datagrid中第9列)为Mexico的行设置为红色,USA的行设为黄色.
        if(Convert.ToString(dataGrid1[e.Row,8]) == "Mexico")
            e.BackColor = Color.Red;
        else 
            if(Convert.ToString(dataGrid1[e.Row,8]) == "USA")
                e.BackColor = Color.Yellow;
    }

    #region DataGridCellColor
    public class DataGridCellColorEventArgs : EventArgs
    {
        private int _row;
        private Color _backcolor;

        public DataGridCellColorEventArgs(int row, Color val)
        {
            _row = row;
            _backcolor = val;
        }
        public int Row
        {
            get{ return _row;}
            set{ _row = value;}
        }
        public Color BackColor
        {
            get{ return _backcolor;}
            set{ _backcolor = value;}
        }
    }



    //为事件建立委托.
    public delegate void CellColorEventHandler(object sender, DataGridCellColorEventArgs e);

    public class DataGridCellColorTextBoxColumn : DataGridTextBoxColumn
    {
        public event CellColorEventHandler CheckCellColor;

        public DataGridCellColorTextBoxColumn()
        {
        }

        //继承DataGridTextBoxColumn的Pain事件.
        protected override void Paint(System.Drawing.Graphics g, System.Drawing.Rectangle bounds, System.Windows.Forms.CurrencyManager source, int rowNum, System.Drawing.Brush backBrush, System.Drawing.Brush foreBrush, bool alignToRight)
        {
            if(CheckCellColor != null)
            {
                //重绘画时,设置当前行的背景色
                DataGridCellColorEventArgs e = new DataGridCellColorEventArgs(rowNum, Color.White);
                CheckCellColor(this, e);

                if(e.BackColor != Color.White)
                {
                    backBrush = new SolidBrush(e.BackColor);
                }
            }

            base.Paint(g, bounds, source, rowNum, backBrush, foreBrush, alignToRight);
        }

        protected override void Edit(System.Windows.Forms.CurrencyManager source, int rowNum, System.Drawing.Rectangle bounds, bool readOnly, string instantText, bool cellIsVisible)
        {
            base.Edit(source, rowNum, bounds, readOnly, instantText, cellIsVisible);
        }
    }
    #endregion