ASP.NET GridView第二个标题行跨越主标题行

Question

我有一个ASP.NET GridView,它有如下所示的列:

| Foo | Bar | Total1 | Total2 | Total3 |

是否可以在两行上创建一个看起来像这样的标题？

|           |  Totals   |    
| Foo | Bar | 1 | 2 | 3 |

每行中的数据将保持不变,因为这只是使标题更漂亮并减少网格占用的水平空间.

如果重要的话,整个GridView都是可排序的.我不打算为添加的"Totals"生成列添加任何排序功能.

编辑:

基于下面给出的一篇文章,我创建了一个继承自GridView的类,并添加了第二个标题行.

namespace CustomControls
{
    public class TwoHeadedGridView : GridView
    {
        protected Table InnerTable
        {
            get
            {
                if (this.HasControls())
                {
                    return (Table)this.Controls[0];
                }

                return null;
            }
        }

        protected override void OnDataBound(EventArgs e)
        {
            base.OnDataBound(e);
            this.CreateSecondHeader();
        }

        private void CreateSecondHeader()
        {
            GridViewRow row = new GridViewRow(0, -1, DataControlRowType.Header, DataControlRowState.Normal);

            TableCell left = new TableHeaderCell();
            left.ColumnSpan = 3;
            row.Cells.Add(left);

            TableCell totals = new TableHeaderCell();
            totals.ColumnSpan = this.Columns.Count - 3;
            totals.Text = "Totals";
            row.Cells.Add(totals);

            this.InnerTable.Rows.AddAt(0, row);
        }
    }
}

如果你像我一样不熟悉ASP.NET,我还应该指出你需要:

1)通过在Web表单中添加这样的行来注册您的课程:

<%@ Register TagPrefix="foo" NameSpace="CustomControls" Assembly="__code"%>

2)将之前标记中的asp:GridView更改为foo:TwoHeadedGridView.不要忘记结束标记.

另一个编辑:

您也可以在不创建自定义类的情况下执行此操作.

只需为网格的DataBound事件添加一个事件处理程序,如下所示:

protected void gvOrganisms_DataBound(object sender, EventArgs e)
{
    GridView grid = sender as GridView;

    if (grid != null)
    {
        GridViewRow row = new GridViewRow(0, -1,
            DataControlRowType.Header, DataControlRowState.Normal);

        TableCell left = new TableHeaderCell();
        left.ColumnSpan = 3;
        row.Cells.Add(left);

        TableCell totals = new TableHeaderCell();
        totals.ColumnSpan = grid.Columns.Count - 3;
        totals.Text = "Totals";
        row.Cells.Add(totals);

        Table t = grid.Controls[0] as Table;
        if (t != null)
        {
            t.Rows.AddAt(0, row);
        }
    }
}

自定义控件的优点是您可以在Web表单的设计视图中看到额外的标题行.但是,事件处理程序方法稍微简单一些.

Answer 1

本文应指出正确的方向.您可以以编程方式创建行并将其添加到位置0的集合中.

Answer 2

我接受了接受的答案方法,但是将标题添加到现有的GridView而不是自定义继承的GridView.

绑定GridView后,我执行以下操作:

/*Create header row above generated header row*/

//create row    
GridViewRow row = new GridViewRow(0, -1, DataControlRowType.Header, DataControlRowState.Normal);

//spanned cell that will span the columns I don't want to give the additional header 
TableCell left = new TableHeaderCell();
left.ColumnSpan = 6;
row.Cells.Add(left);

//spanned cell that will span the columns i want to give the additional header
TableCell totals = new TableHeaderCell();
totals.ColumnSpan = myGridView.Columns.Count - 3;
totals.Text = "Additional Header";
row.Cells.Add(totals);

//Add the new row to the gridview as the master header row
//A table is the only Control (index[0]) in a GridView
((Table)myGridView.Controls[0]).Rows.AddAt(0, row);

/*fin*/