我有3个问题:
我正在以一种好的方式完成我的任务
为什么当我滚动dataGridView时,画的矩形消失了..
为什么画画这么慢......
下面是我想在每列中绘制一个带有文本的彩色矩形的代码,这些矩形具有相同的值,空值不应该有矩形
void DataGridView1CellPainting(object sender,DataGridViewCellPaintingEventArgs e) {
foreach(this.dataGridView1.Columns中的DataGridViewColumn列){
string tempCellValue = string.Empty;
int tempRectX = -1;
int tempRectY = -1;
int tempRectYEnd = -1;
int tempRectWidth = -1;
int tempRectHeight = -1;
foreach (DataGridViewRow row in this.dataGridView1.Rows){
Rectangle rect = this.dataGridView1.GetCellDisplayRectangle(
column.Index, row.Index,true);
DataGridViewCell cell = dataGridView1.Rows[row.Index].Cells[column.Index];
if ( cell.Value!=null){
if (tempRectX==-1){
tempRectX = rect.Location.X;
tempRectY = rect.Location.Y;
tempCellValue = cell.Value.ToString();
}else
if (cell.Value.ToString()!=tempCellValue){
tempRectYEnd = rect.Location.Y;
Rectangle newRect = new Rectangle(tempRectX,
tempRectY , 5 ,
tempRectYEnd );
using (
Brush gridBrush = new SolidBrush(Color.Coral),
backColorBrush = new SolidBrush(Color.Coral))
{
using (Pen gridLinePen = new Pen(gridBrush))
{
e.Graphics.FillRectangle(backColorBrush,newRect);
} }
tempRectX=-1;
tempCellValue = string.Empty;
}
}else if (tempRectX!=-1){
tempRectYEnd = rect.Location.Y;
Rectangle newRect = new Rectangle(tempRectX,
tempRectY , 50 ,
tempRectYEnd );
using (
Brush gridBrush = new SolidBrush(Color.Coral),
backColorBrush = new SolidBrush(Color.Coral))
{
using (Pen gridLinePen = new Pen(gridBrush))
{
e.Graphics.FillRectangle(backColorBrush,newRect);
} }
tempRectX=-1;
tempCellValue = string.Empty;
}
}}
答案 0 :(得分:1)
DataGridView1CellPainting事件旨在为一个单元格绘制或更改绘制行为。
DGV为每个可见的Cell提出此事件。
当绘制其他单元格时,代码会变慢。
http://msdn.microsoft.com/en-us/library/system.windows.forms.datagridviewcellpaintingeventargs.aspx