將DataGrid中滿足條件的行設為不同的背景色(WinForm).

由于項目需要, 需要對DataGrid的數(shù)據(jù)行， 按不同的條件以不同的背景色相區(qū)別。 由于DataGrid中沒有相關的屬性和方法可以直接設置，要完成這個功能還挺費些功夫。在網上搜了半天，也沒找到解決方案。只好自己動手，豐衣足食了，:) 。研究了半天, 終于搞定它了。好東西不敢獨享，特貼出來，希望能給需要的人帶來些幫助。



{

//...

//使用DataGridTableStyle 顯示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;

//為每個單元格建立設置背景色的事件.
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)
{
//根據(jù)條件, 將相關行設置不同的背景色.
//下例為國家(datagrid中第9列)為Mexico的行設置為紅色,USA的行設為黃色.
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;
}


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;}
}
}



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

public class DataGridCellColorTextBoxColumn : DataGridTextBoxColumn
{
public event CellColorEventHandler CheckCellColor;

public DataGridCellColorTextBoxColumn()
{
}

//繼承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)
{
//重繪畫時,設置當前行的背景色
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);
}
}