C#,WinForm, 怎么合并DataGridView 中 纵向的两个单元格??请给出详细说明。

发布网友 发布时间：2022-12-18 08:45

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热心网友 时间：2023-09-18 04:07

private void dataGridView1_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
{
Brush gridBrush = new SolidBrush(this.dataGridView1.GridColor);
SolidBrush backBrush = new SolidBrush(e.CellStyle.BackColor);
SolidBrush fontBrush = new SolidBrush(e.CellStyle.ForeColor);
int cellheight;
int fontheight;
int cellwidth;
int fontwidth;
int countU = 0;
int countD = 0;
int count = 0;
// 对第1列相同单元格进行合并
if (e.ColumnIndex == 0 && e.RowIndex != -1)
{
cellheight = e.CellBounds.Height;
fontheight = (int)e.Graphics.MeasureString(e.Value.ToString(), e.CellStyle.Font).Height;
cellwidth = e.CellBounds.Width;
fontwidth = (int)e.Graphics.MeasureString(e.Value.ToString(), e.CellStyle.Font).Width;
Pen gridLinePen = new Pen(gridBrush);
string curValue = e.Value == null ? "" : e.Value.ToString().Trim();
string curSelected = this.dataGridView1.Rows[e.RowIndex].Cells[0].Value == null ? ""
: this.dataGridView1.Rows[e.RowIndex].Cells[0].Value.ToString().Trim();
if (!string.IsNullOrEmpty(curValue))
{
for (int i = e.RowIndex; i < this.dataGridView1.Rows.Count; i++)
{
if (this.dataGridView1.Rows[i].Cells[0].Value.ToString().Equals(curValue))
{
this.dataGridView1.Rows[i].Cells[0].Selected = this.dataGridView1.Rows[e.RowIndex].Selected;

this.dataGridView1.Rows[i].Selected = this.dataGridView1.Rows[e.RowIndex].Selected;

countD++;

}

else
{
break;
}
}
for (int i = e.RowIndex; i >= 0; i--)
{
if (this.dataGridView1.Rows[i].Cells[0].Value.ToString().Equals(curValue))
{
this.dataGridView1.Rows[i].Cells[0].Selected = this.dataGridView1.Rows[e.RowIndex].Selected;

this.dataGridView1.Rows[i].Selected = this.dataGridView1.Rows[e.RowIndex].Selected;

countU++;
}
else
{
break;
}
}

count = countD + countU - 1;
if (count < 2) { return; }
}

if (this.dataGridView1.Rows[e.RowIndex].Selected)
{
backBrush.Color = e.CellStyle.SelectionBackColor;
fontBrush.Color = e.CellStyle.SelectionForeColor;
}

e.Graphics.FillRectangle(backBrush, e.CellBounds);
e.Graphics.DrawString((String)e.Value, e.CellStyle.Font, fontBrush, e.CellBounds.X , e.CellBounds.Y - cellheight * (countU - 1) + (cellheight * count - fontheight) / 2);

if (countD == 1)
{
e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left, e.CellBounds.Bottom - 1, e.CellBounds.Right - 1, e.CellBounds.Bottom - 1);
count = 0;
}

// 画右边线
e.Graphics.DrawLine(gridLinePen, e.CellBounds.Right - 1, e.CellBounds.Top, e.CellBounds.Right - 1, e.CellBounds.Bottom);

e.Handled = true;
}
}

热心网友 时间：2023-09-18 04:07

此例合并第2.3列
private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
if(!IsPostBack)
{
DataTable table =tempTable();
DataGrid1.DataSource =table;
DataGrid1.DataBind();

}
}
DataTable tempTable()
{
DataTable table =new DataTable();
table.Columns.Add(new DataColumn( "ID ",typeof(System.Int32)));
table.Columns.Add(new DataColumn( "FirstName ",typeof(System.String)));
table.Columns.Add(new DataColumn( "LastName ",typeof(System.String)));

for(int i=0;i <5;i++)
{
DataRow row =table.NewRow();
row[ "ID "] =i;
row[ "FirstName "]=i.ToString();
row[ "LastName "]=i.ToString();
table.Rows.Add(row);
}
return table;
}

#region Web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}

/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.DataGrid1.PreRender += new System.EventHandler(this.DataGrid1_PreRender);
this.Load += new System.EventHandler(this.Page_Load);

}
#endregion

private void DataGrid1_PreRender(object sender, System.EventArgs e)
{
for(int i=0;i <DataGrid1.Items.Count;i++)
{
TableCell cell1 =DataGrid1.Items[i].Cells[1];
TableCell cell2 =DataGrid1.Items[i].Cells[2];
cell1.Text +=cell2.Text;
cell1.ColumnSpan =2;
cell2.Visible =false;

}

}