GridView无限层复杂表头的实现
ICollection CreateDataSource( )
{
System.Data.DataTable dt = new System.Data.DataTable();
System.Data.DataRow dr;
dt.Columns.Add(new System.Data.DataColumn("学生班级", typeof(System.String)));
dt.Columns.Add(new System.Data.DataColumn("学生姓名", typeof(System.String)));
dt.Columns.Add(new System.Data.DataColumn("语文", typeof(System.Decimal)));
dt.Columns.Add(new System.Data.DataColumn("数学", typeof(System.Decimal)));
dt.Columns.Add(new System.Data.DataColumn("英语", typeof(System.Decimal)));
dt.Columns.Add(new System.Data.DataColumn("计算机", typeof(System.Decimal)));
for (int i = 0; i < 8; i++)
{
System.Random rd = new System.Random(Environment.TickCount * i); ;
dr = dt.NewRow();
dr[0] = "班级" + i.ToString();
dr[1] = "学生" + i.ToString();
dr[2] = System.Math.Round(rd.NextDouble() * 100, 2);
dr[3] = System.Math.Round(rd.NextDouble() * 100, 2);
dr[4] = System.Math.Round(rd.NextDouble() * 100, 2);
dr[5] = System.Math.Round(rd.NextDouble() * 100, 2);
dt.Rows.Add(dr);
}
System.Data.DataView dv = new System.Data.DataView(dt);
return dv;
}
protected void Page_Load( object sender, EventArgs e )
{
if (!IsPostBack)
{
GridView1.BorderColor = System.Drawing.Color.DarkOrange;
GridView1.DataSource = CreateDataSource();
GridView1.DataBind();
}
}
protected void GridView1_RowCreated( object sender, GridViewRowEventArgs e )
{
if (e.Row.RowType == DataControlRowType.Header)
{
//创建一个GridViewRow，相当于表格的 TR 一行
GridViewRow rowHeader = new GridViewRow(0, 0, DataControlRowType.Header, DataControlRowState.Normal);
string HeaderBackColor = "#EDEDED";
rowHeader.BackColor = System.Drawing.ColorTranslator.FromHtml(HeaderBackColor);
//实现确定要显示的表头样式，也可以通过计算生成
// <tr>
// <td rowspan='2'>关键单元格</td>
// <td colspan='2'>表头文字</td>
// <td colspan='2'>表头文字</td>
// <td>表头文字</td>
// </tr>
// <tr bgcolor='#FFF'>
// <td colspan='2'>表头文字</td>
// <td rowspan='2'>表头文字</td>
// <td colspan='2'>表头文字</td>
// </tr>
// <tr bgcolor='#FFF'>
// <td>表头文字</td>
// <td>表头文字</td>
// <td>表头文字</td>
// <td>表头文字</td>
// <td>表头文字</td>";
// </tr>
// 上面的样式可以设置斜线
Literal newCells = new Literal();
newCells.Text = @"表头文字1</th>
<th colspan='2'>表头文字2</th>
<th colspan='2'>表头文字3</th>
<th>表头文字4</th>
</tr>
<tr bgcolor='" + HeaderBackColor + "'>";
newCells.Text += @"
<th colspan='2'>表头文字5</th>
<th rowspan='2'>表头文字6</th>
<th colspan='2'>表头文字7</th>
</tr>
<tr bgcolor='" + HeaderBackColor + "'>";
newCells.Text += @"
<th>表头文字8</th>
<th>表头文字9</th>
<th>表头文字10</th>
<th>表头文字11</th>
<th>表头文字12";
TableCellCollection cells = e.Row.Cells;
TableHeaderCell headerCell = new TableHeaderCell();
//下面的属性设置与 <td rowspan='2'>关键单元格</td> 要一致
headerCell.RowSpan = 2;
headerCell.Controls.Add(newCells);
rowHeader.Cells.Add(headerCell);
rowHeader.Cells.Add(headerCell);
rowHeader.Visible = true;
//添加到 GridView1
GridView1.Controls[0].Controls.AddAt(0, rowHeader);
}
}
protected void GridView1_RowDataBound( object sender, GridViewRowEventArgs e )
{
if (e.Row.RowType == DataControlRowType.Header)
{
e.Row.Attributes.Add("style", "background:#9999FF;color:#FFFFFF;font-size:14px");
}
else
{
e.Row.Attributes.Add("style", "background:#FFF");
}
}
方法二
表格的多行复合表头是在开发中经常遇到的问题,怎么扩展GridView控件以实现多行表头呢
主体思路是这样的,GridView在ASP.NET中最终是转化为html的表格格式来显示的,所以我们要在其中做点文章,
看下面这段代码:
//在GridView的RowCreated事件中重写表头
protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e)
{
判断创建的行是不是标题行
if (e.Row.RowType == DataControlRowType.Header)
{
TableCellCollection tcl = e.Row.Cells;
//清除自动生成的表头
tcl.Clear();
//添加新的表头
tcl.Add(new TableHeaderCell());
tcl[0].RowSpan = 2;
tcl[0].Text = "标题s";
Label l1 = new Label();
l1.Text = "uu";
Button bt = new Button();
bt.Text = "1";
//因为自定义表头,所以原来系统中实现的排序功能就失效了
//下面语句可以自己在表头中添加控件,自己实现排序功能
tcl[0].Controls.Add(l1);
tcl[0].Controls.Add(bt);
tcl.Add(new TableHeaderCell());
tcl[1].ColumnSpan = 2;
tcl[1].Text = "标题2";
tcl.Add(new TableHeaderCell());
tcl[2].RowSpan = 2;
tcl[2].Text = "标题3";
tcl.Add(new TableHeaderCell());
tcl[3].ColumnSpan = 3;
tcl[3].Text = "标题4";
tcl.Add(new TableHeaderCell());
tcl[4].RowSpan = 2;
//这段是重点 其实在生成的html中tcl[4]转化为<th>标题5</th>
//所以依照该原则注入html标签来实现,原理有些类似于SQL注入攻击
tcl[4].Text = "标题5</th></tr><tr><th>标题2-1</th><th>标题2-2</th><th>标题4-1</th><th>标题4-2</th><th>标题4-3";
}
}
