在标题之后添加 Gridview 行 [英] Add Gridview Row AFTER Header

问题描述

我正在尝试向 Gridview 添加新的标题行.此行应显示在原始标题行下方.

i'm trying to add a new headerrow to a Gridview. This row should appear below the original headerrow.

据我所知，我有两个事件可供选择:

As far as I know I have two events to choose from:

1.) Gridview_RowDataBound2.) Gridview_RowCreated

1.) Gridview_RowDataBound 2.) Gridview_RowCreated

选项 1 不是一个选项，因为网格不绑定每个回发的数据.选项 2 没有按预期工作.我可以添加行，但它添加在 HeaderRow 之前，因为在此事件中尚未添加 HeaderRow 本身...

Option 1 is not an option as the grid is not binding the data on each postback. Option 2 does not work as expected. I can add the row, but it is added before the HeaderRow because the HeaderRow itself is not added yet in this event...

请帮忙，谢谢！

代码:(InnerTable 属性由自定义 gridview 公开)

Code: (InnerTable property is exposed by custom gridview)

    Private Sub GridView1_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowDataBound
    If e.Row.RowType = DataControlRowType.Header Then
        Dim r As New GridViewRow(-1, -1, DataControlRowType.Header, DataControlRowState.Normal)

        For Each c As DataControlField In CType(sender, GridView).Columns
            Dim nc As New TableCell
            nc.Text = c.AccessibleHeaderText
            nc.BackColor = Drawing.Color.Cornsilk
            r.Cells.Add(nc)
        Next

        Dim t As Table = GridView1.InnerTable
        t.Controls.Add(r)
    End If
End Sub

推荐答案

既然这是自定义的 GridView，为什么不考虑覆盖 CreateChildControls 方法?

Since this is a custom GridView, why don't you consider overriding the CreateChildControls method?

即(对不起，C#):

protected override void CreateChildControls()
{
    base.CreateChildControls();

    if (HeaderRow != null)
    {
        GridViewRow header = CreateRow(-1, -1, DataControlRowType.Header, DataControlRowState.Normal);
        for (int i = 0; i < Columns.Count; i++)
        {
            TableCell cell = new TableCell();
            cell.Text = Columns[i].AccessibleHeaderText;
            cell.ForeColor = System.Drawing.Color.Black;
            cell.BackColor = System.Drawing.Color.Cornsilk;
            header.Cells.Add(cell);
        }

        Table table = (Table)Controls[0];
        table.Rows.AddAt(1, header);
    }
}

更新正如 Ropstah 所提到的，上面的 sniplet 不适用于分页.我将代码移到 PrepareControlHierarchy 中，现在它可以优雅地进行分页、选择和排序.

UPDATE As was mentioned by Ropstah, the sniplet above does not work with pagination on. I moved the code to a PrepareControlHierarchy and now it works gracefully with pagination, selection, and sorting.

protected override void PrepareControlHierarchy()
{
    if (ShowHeader && HeaderRow != null)
    {
        GridViewRow header = CreateRow(-1, -1, DataControlRowType.Header, DataControlRowState.Normal);
        for (int i = 0; i < Columns.Count; i++)
        {
            TableCell cell = new TableCell();
            cell.Text = Columns[i].AccessibleHeaderText;
            cell.ForeColor = System.Drawing.Color.Black;
            cell.BackColor = System.Drawing.Color.Cornsilk;
            header.Cells.Add(cell);
        }

        Table table = (Table)Controls[0];
        table.Rows.AddAt(1, header);
    }

    //it seems that this call works at the beginning just as well
    //but I prefer it here, since base does some style manipulation on existing columns
    base.PrepareControlHierarchy();
}

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