關鍵點：（1）TreeList中顯示的單元格默認不顯示上、下、左、右邊框，顯示的是TreeList自身的行橫邊框、列縱邊框，具體對應TreeList屬性中OptionView項下的ShowVertLines、ShowHorzLines兩項，將其對應默認值由默認False改為True即可去除行橫邊框、列縱邊框，然后設置怎樣的單元格格式顯示什么樣的單元格格式；
（2）在*_CustomDrawNodeCell中修改函數，而不是*_NodeCellStyle中修改，另外需要注意，前者在后者前運行，因此后者中的修改會覆蓋掉前者中的修改。
（3）繪制TreeList單元格網線時，自動會覆蓋掉單元格的所有邊框，這與WinForm中只需繪制右、下，不需要繪制左上邊框不同。
（4）如果只想匯總Treelist單元格邊框，則不需要設置e.Hander = true;而如果想重繪單元格值或填充顏色則必須設置e.Hander = true;並且其值域不同，重繪的區域不同，即可以針對性重繪。
效果圖如下：
舉例：
(1)具體實現相關代碼如下：
private void tlPublic_CustomDrawNodeCell(object sender, DevExpress.XtraTreeList.CustomDrawNodeCellEventArgs e)
{
DataRow dr = e.Node.Tag as DataRow;
if (dr != null)
{
Brush grid = new SolidBrush(Color.LightGray);//Color.Gray
Pen gridPen = new Pen(grid);
if (dr["PublicId"].ToString() == "-2")
{
//e.Appearance.ForeColor = TrueLore.PBTool.BaseUI.DataGridViewComponent.GridViewSumRowFontColor;
e.Appearance.Font = new Font(this.Font, FontStyle.Bold);
}
else if (e.Node.HasChildren)
{
Color parentCellBackColor = TrueLore.PBTool.BaseUI.DataGridViewComponent.TreeGridViewBidFileRowBackColor;
e.Cache.FillRectangle(parentCellBackColor,e.Bounds);
////繪制值
e.Graphics.DrawLine(gridPen, e.Bounds.X, e.Bounds.Y, e.Bounds.X + e.Bounds.Width, e.Bounds.Y);
e.Graphics.DrawLine(gridPen, e.Bounds.X, e.Bounds.Y + e.Bounds.Height, e.Bounds.X + e.Bounds.Width, e.Bounds.Y + e.Bounds.Height);
}
else
{
#region TreeList實現類似單元格合並的效果
//現在屬性中OptionView項下將ShowHorzlines設置為True
//當繪制TreeList單元格時會覆蓋掉單元格的上下左右邊框，因為TreeList的列縱線被設置為顯示，行橫線被設置為不顯示，所以只需繪制上下線即可。
bool isMergeCell = false;
string cellCaption = string.Empty;
foreach (string caption in colsHeaderText_H)
{
if (this.tlPublic.Columns[e.Column.AbsoluteIndex].Caption == caption)
{
isMergeCell = true;
cellCaption = caption;
break;
}
}
//縱向合並
if (isMergeCell == true) //this.tlPublic.Columns[e.Column.AbsoluteIndex].Caption == caption) //&& e.Node.NextNode != null
{
Brush cellBackBrush = new System.Drawing.SolidBrush(e.Appearance.BackColor);
if (e.Node.NextNode == null)
{
//下邊緣的線
e.Graphics.DrawLine(gridPen, e.Bounds.X, e.Bounds.Y + e.Bounds.Height, e.Bounds.X + e.Bounds.Width, e.Bounds.Y + e.Bounds.Height);
}
else if (e.Node.GetDisplayText(e.Column.AbsoluteIndex) != e.Node.NextNode.GetDisplayText(e.Column.AbsoluteIndex))
{
//下邊緣的線
e.Graphics.DrawLine(gridPen, e.Bounds.X, e.Bounds.Y + e.Bounds.Height, e.Bounds.X + e.Bounds.Width, e.Bounds.Y + e.Bounds.Height);
}
else
{
e.Graphics.FillRectangle(cellBackBrush, e.Bounds);
e.Handled = true; //顯示重繪（放置位置即值域不同，顯示重繪的區域不同）
}
//首子節點繪制上邊框，之所以放在代碼最后是因為放在前面可能在單元格填充時覆蓋掉
if (e.Node == e.Node.ParentNode.FirstNode)
{
e.Graphics.DrawLine(gridPen, e.Bounds.X, e.Bounds.Y, e.Bounds.X + e.Bounds.Width, e.Bounds.Y);
}
}
//非合並列
else
{
//當繪制TreeList單元格時會覆蓋掉單元格的上下左右邊框，因為TreeList的列縱線被設置為顯示，行橫線被設置為不顯示，所以只需繪制上下線即可。
e.Graphics.DrawLine(gridPen, e.Bounds.X, e.Bounds.Y, e.Bounds.X + e.Bounds.Width, e.Bounds.Y);
e.Graphics.DrawLine(gridPen, e.Bounds.X, e.Bounds.Y + e.Bounds.Height, e.Bounds.X + e.Bounds.Width, e.Bounds.Y + e.Bounds.Height);
}
#endregion
}
}
}
多加代碼：
(2)具體實現相關代碼如下：
//需要(行、列)合並的所有列標題名
List<String> colsHeaderText_H = new List<String>();
private void InitFormatColumns()
{
colsHeaderText_H.Add("量化合計");
colsHeaderText_H.Add("投標報價");
colsHeaderText_H.Add("評標價");
}
private void tlPublic_CustomDrawNodeCell(object sender, DevExpress.XtraTreeList.CustomDrawNodeCellEventArgs e)
{
DataRow dr = e.Node.Tag as DataRow;
if (dr != null)
{
Brush gridBrush = new SolidBrush(Color.Pink);
Brush grid = new SolidBrush(Color.Gray);
Pen gridPen = new Pen(grid);
////e.Graphics.FillRectangle(gridBrush, e.Bounds);
//e.Cache.DrawRectangle(gridPen, e.Bounds);
//下邊緣的線
//e.Graphics.DrawLine(gridPen, e.Bounds.X, e.Bounds.Y + e.Bounds.Height, e.Bounds.X + e.Bounds.Width, e.Bounds.Y + e.Bounds.Height);
////繪制值
//e.Graphics.DrawString(e.Node.GetDisplayText(e.Column.AbsoluteIndex), e.Appearance.Font,
// Brushes.Crimson, e.Bounds.X + 2, e.Bounds.Y + 2, StringFormat.GenericDefault);
if (dr["PublicId"].ToString() == "-2")
{
e.Appearance.ForeColor = TrueLore.PBTool.BaseUI.DataGridViewComponent.GridViewSumRowFontColor;
e.Appearance.Font = new Font(this.Font, FontStyle.Bold);
//e.Graphics.FillRectangle(gridBrush, e.Bounds);
//e.Cache.DrawRectangle(gridPen,e.Bounds);
//下邊緣的線
//e.Graphics.DrawLine(gridPen, e.Bounds.X, e.Bounds.Y + e.Bounds.Height, e.Bounds.X + e.Bounds.Width, e.Bounds.Y + e.Bounds.Height);
////繪制值
//e.Graphics.DrawString(e.Node.GetDisplayText(e.Column.AbsoluteIndex), e.Appearance.Font,
// Brushes.Crimson, e.Bounds.X + 2, e.Bounds.Y + 2, StringFormat.GenericDefault);
}
else if (e.Node.HasChildren)
{
//e.Appearance.BackColor = TrueLore.PBTool.BaseUI.DataGridViewComponent.TreeGridViewParentRowBackColor;
Color parentCellBackColor = TrueLore.PBTool.BaseUI.DataGridViewComponent.TreeGridViewParentRowBackColor;
//e.Cache.DrawRectangle(gridPen, e.Bounds);
e.Cache.FillRectangle(parentCellBackColor,e.Bounds);
////繪制值
e.Graphics.DrawString(e.Node.GetDisplayText(e.Column.AbsoluteIndex), e.Appearance.Font,
Brushes.Crimson, e.Bounds.X + 2, e.Bounds.Y + 2, StringFormat.GenericDefault);//下邊緣的線
e.Graphics.DrawLine(gridPen, e.Bounds.X, e.Bounds.Y + e.Bounds.Height, e.Bounds.X + e.Bounds.Width, e.Bounds.Y + e.Bounds.Height);
//e.Handled = true;
}
else
{
#region 注釋代碼
//string tmpCaption = e.Column.Caption;
//if ("量化合計" == tmpCaption || "投標報價" == tmpCaption || "評標價" == tmpCaption)
//{
// e.Appearance.BorderColor = e.Appearance.BackColor;
// e.Handled = true;
//}
//e.Node.TreeList.RefreshCell(e.Node, e.Column);
//e.Cache.DrawRectangle();
#endregion
#region TreeList實現類似單元格合並的效果
//現在屬性中OptionView項下將ShowHorzlines設置為True
//當繪制TreeList單元格時會覆蓋掉單元格的上下左右邊框，因為TreeList的列縱線被設置為顯示，行橫線被設置為不顯示，所以只需繪制上下線即可。
bool isMergeCell = false;
string cellCaption = string.Empty;
foreach (string caption in colsHeaderText_H)
{
if (this.tlPublic.Columns[e.Column.AbsoluteIndex].Caption == caption)
{
isMergeCell = true;
cellCaption = caption;
break;
}
}
//縱向合並
if (isMergeCell == true) //this.tlPublic.Columns[e.Column.AbsoluteIndex].Caption == caption) //&& e.Node.NextNode != null
{
Brush cellBackBrush = new System.Drawing.SolidBrush(e.Appearance.BackColor);
//若與下一單元格值不同
//if (e.CellValue.ToString() != e.Node.NextNode.GetDisplayText(e.Column.AbsoluteIndex))
if (e.Node.NextNode == null)
{
//e.Cache.DrawRectangle(gridPen, e.Bounds);
e.Graphics.FillRectangle(cellBackBrush, e.Bounds);
//e.Appearance.FillRectangle(e.Cache, e.Bounds);
//下邊緣的線
e.Graphics.DrawLine(gridPen, e.Bounds.X, e.Bounds.Y + e.Bounds.Height, e.Bounds.X + e.Bounds.Width, e.Bounds.Y + e.Bounds.Height);
//繪制值
e.Graphics.DrawString(e.Node.GetDisplayText(e.Column.AbsoluteIndex), e.Appearance.Font,
Brushes.Crimson, e.Bounds.X + 2, e.Bounds.Y + 2, StringFormat.GenericDefault);
}
else if (e.Node.GetDisplayText(e.Column.AbsoluteIndex) != e.Node.NextNode.GetDisplayText(e.Column.AbsoluteIndex))
{
//e.Cache.DrawRectangle(gridPen, e.Bounds);
e.Graphics.FillRectangle(cellBackBrush, e.Bounds);
//e.Appearance.FillRectangle(e.Cache, e.Bounds);
//下邊緣的線
//e.Graphics.DrawLine(gridPen, e.Bounds.Left, e.Bounds.Bottom - 1, e.Bounds.Right, e.Bounds.Bottom);
//e.Graphics.DrawLine(gridPen, e.Bounds.X, e.Bounds.Y + e.Bounds.Height, e.Bounds.X + e.Bounds.Width, e.Bounds.Y + e.Bounds.Height);
//繪制值
e.Graphics.DrawString(e.Node.GetDisplayText(e.Column.AbsoluteIndex), e.Appearance.Font,
Brushes.Crimson, e.Bounds.X + 2, e.Bounds.Y + 2, StringFormat.GenericDefault);
}
else
{
//e.Graphics.DrawLine(gridPen, e.Bounds.X, e.Bounds.Y + e.Bounds.Height, e.Bounds.X + e.Bounds.Width, e.Bounds.Y + e.Bounds.Height);
//e.Appearance.FillRectangle(e.Cache, e.Bounds);
e.Graphics.FillRectangle(cellBackBrush, e.Bounds);
}
//break;
}
//非合並列
else
{
//e.Cache.DrawRectangle(gridPen, e.Bounds);
//當繪制TreeList單元格時會覆蓋掉單元格的上下左右邊框，因為TreeList的列縱線被設置為顯示，行橫線被設置為不顯示，所以只需繪制上下線即可。
e.Graphics.DrawLine(gridPen, e.Bounds.X, e.Bounds.Y, e.Bounds.X + e.Bounds.Width, e.Bounds.Y);
//繪制值
e.Graphics.DrawString(e.Node.GetDisplayText(e.Column.AbsoluteIndex), e.Appearance.Font,
Brushes.Crimson, e.Bounds.X + 2, e.Bounds.Y + 2, StringFormat.GenericDefault);
//e.Handled = true;
////下邊緣的線
e.Graphics.DrawLine(gridPen, e.Bounds.X, e.Bounds.Y + e.Bounds.Height, e.Bounds.X + e.Bounds.Width, e.Bounds.Y + e.Bounds.Height);
}
////設置處理事件完成（關鍵點），只有設置為ture,才能顯示出想要的結果。
//e.Handled = true;
#endregion
//}
}
//設置處理事件完成（關鍵點），只有設置為ture,才能顯示出想要的結果。
e.Handled = true;
}
}
#endregion
private void tlPublic_NodeCellStyle(object sender, DevExpress.XtraTreeList.GetCustomNodeCellStyleEventArgs e)
{
//string tmpCaption = e.Column.Caption;
//if ("量化合計" == tmpCaption || "投標報價" == tmpCaption || "評標價" == tmpCaption)
//{
// e.Appearance.BorderColor = e.Appearance.BackColor;
// e.Appearance.ForeColor = Color.Red;
// e.Node.TreeList.OptionsView.ShowFocusedFrame = false;
//e.Column.AppearanceCell.Options.UseBorderColor = true;
//e.Column.AppearanceCell.BorderColor = Color.DeepPink;
//}
//e.Appearance.BackColor = TrueLore.PBTool.BaseUI.DataGridViewComponent.TreeGridViewParentRowBackColor;
}
(3)不想覆蓋已有單元格內容（選擇性覆蓋）：首選將數節點的縱向邊框去掉，再則添加事件及代碼如下：
private void tlcBidEvalationPrice_CustomDrawNodeCell(object sender, DevExpress.XtraTreeList.CustomDrawNodeCellEventArgs e)
{
if (e.Node == null)
{
return;
}
DataRow dr = e.Node.Tag as DataRow;
if (dr != null)
{
Brush grid = new SolidBrush(Color.LightGray); //Color.Gray
Pen gridPen = new Pen(grid);
if (dr["PublicId"].ToString() == "-1")
{
Color parentCellBackColor = TrueLore.PBTool.BaseUI.DataGridViewComponent.TreeGridViewBidFileRowBackColor;
e.Cache.FillRectangle(parentCellBackColor, e.Bounds);
e.Graphics.DrawLine(gridPen, e.Bounds.X, e.Bounds.Y, e.Bounds.X + e.Bounds.Width, e.Bounds.Y);
e.Graphics.DrawLine(gridPen, e.Bounds.X, e.Bounds.Y + e.Bounds.Height, e.Bounds.X + e.Bounds.Width, e.Bounds.Y + e.Bounds.Height);
}
else if (dr["PublicId"].ToString() == "-2")
{
//Color sumRowBackColor = TrueLore.PBTool.BaseUI.DataGridViewComponent.GridViewSumRowBackColor;
//e.Cache.FillRectangle(sumRowBackColor, e.Bounds);
//當繪制TreeList單元格時會覆蓋掉單元格的上下左右邊框，因為TreeList的列縱線被設置為顯示，行橫線被設置為不顯示，所以只需繪制上下線即可。
e.Graphics.DrawLine(gridPen, e.Bounds.X, e.Bounds.Y, e.Bounds.X + e.Bounds.Width, e.Bounds.Y);
//下邊緣的線
e.Graphics.DrawLine(gridPen, e.Bounds.X, e.Bounds.Y + e.Bounds.Height, e.Bounds.X + e.Bounds.Width, e.Bounds.Y + e.Bounds.Height);
}
else
{
#region TreeList實現類似單元格合並的效果
//現在屬性中OptionView項下將ShowHorzlines設置為True
//當繪制TreeList單元格時會覆蓋掉單元格的上下左右邊框，因為TreeList的列縱線被設置為顯示，行橫線被設置為不顯示，所以只需繪制上下線即可。
bool isMergeCell = false;
string cellCaption = string.Empty;
foreach (string caption in colsHeaderText_H)
{
if (this.tlcBidEvalationPrice.Columns[e.Column.AbsoluteIndex].Caption == caption)
{
isMergeCell = true;
cellCaption = caption;
break;
}
}
//縱向合並
if (isMergeCell == true)
{
Brush cellBackBrush = new System.Drawing.SolidBrush(e.Appearance.BackColor);
//若與下一單元格值不同
if (e.Node.NextNode == null )//|| e.Node.NextNode.NextNode == null
{
e.Graphics.FillRectangle(cellBackBrush, e.Bounds);
//當繪制TreeList單元格時會覆蓋掉單元格的上下左右邊框，因為TreeList的列縱線被設置為顯示，行橫線被設置為不顯示，所以只需繪制上下線即可。
e.Graphics.DrawLine(gridPen, e.Bounds.X, e.Bounds.Y, e.Bounds.X + e.Bounds.Width, e.Bounds.Y);
//下邊緣的線
e.Graphics.DrawLine(gridPen, e.Bounds.X, e.Bounds.Y + e.Bounds.Height, e.Bounds.X + e.Bounds.Width, e.Bounds.Y + e.Bounds.Height);
//繪制值
e.Graphics.DrawString(e.Node.GetDisplayText(e.Column.AbsoluteIndex), e.Appearance.Font,
Brushes.Black, e.Bounds.X, e.Bounds.Y, StringFormat.GenericTypographic);
}
else if (e.Node.GetDisplayText(e.Column.AbsoluteIndex) != e.Node.NextNode.GetDisplayText(e.Column.AbsoluteIndex))
{
e.Graphics.FillRectangle(cellBackBrush, e.Bounds);
}
else
{
e.Graphics.FillRectangle(cellBackBrush, e.Bounds);
}
}
//非合並列
else
{
//當繪制TreeList單元格時會覆蓋掉單元格的上下左右邊框，因為TreeList的列縱線被設置為顯示，行橫線被設置為不顯示，所以只需繪制上下線即可。
e.Graphics.DrawLine(gridPen, e.Bounds.X, e.Bounds.Y, e.Bounds.X + e.Bounds.Width, e.Bounds.Y);
//下邊緣的線
e.Graphics.DrawLine(gridPen, e.Bounds.X, e.Bounds.Y + e.Bounds.Height, e.Bounds.X + e.Bounds.Width, e.Bounds.Y + e.Bounds.Height);
}
#endregion
}
//設置處理事件完成（關鍵點），只有設置為ture,才能顯示出想要的結果。
//e.Handled = true; //不想覆蓋已有內容就注掉（只繪制邊框）
}
}