Question

我有一个ASP.NET GridView，它的列看起来像这样：

| 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。我不打算将添加的“Totals”生成列具有任何排序功能。

修改

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）通过在您的网络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

This article应该指出正确的方向。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*/

Answer 3

alt text

选择在VB.NET中使用RowDataBound方法的人

如果最终弹出太多额外的标题行，添加一个If语句只有在gridview的标题行没有任何内容时才会继续（意味着它是当前绑定的那个）

 If grid.HeaderRow Is Nothing Then

Answer 4

您必须创建一个扩展gridview的类，然后覆盖CreateRow方法。

尝试this作为起点

Answer 5

添加行后添加t.EnableViewState = false;：

Dim t As Table = TryCast(grid.Controls(0), Table)
If t IsNot Nothing Then
    t.Rows.AddAt(0, row)
End If

t.EnableViewState = false;

Answer 6

请参阅https://stackoverflow.com/a/9333714/1060656

我创建了这个解决方案示例

要在本地系统中运行，需要创建2个文件（一个用于控件，一个用于aspx），您可以在一个项目或两个项目中完成。

GridViewPlus ==＆gt;控制类
GridViewPlusCustomHeaderRows ==＆gt;用于保存自定义标题类
CustomHeaderEventArgs ==＆gt;创建自定义标题行时的事件参数

aspx文件==＆gt;测试程序

public class GridViewPlus : GridView
{

    public event EventHandler<CustomHeaderEventArgs> CustomHeaderTableCellCreated;

    private GridViewPlusCustomHeaderRows _rows;

    public GridViewPlus() : base ()
    {
        _rows = new GridViewPlusCustomHeaderRows();
    }

    /// <summary>
    /// Allow Custom Headers
    /// </summary>
    public bool ShowCustomHeader { get; set; }


    [PersistenceMode(PersistenceMode.InnerDefaultProperty)]
    [MergableProperty(false)]
    public GridViewPlusCustomHeaderRows CustomHeaderRows
    {
        get {return  _rows; }

    }

    protected virtual void OnCustomHeaderTableCellCreated(CustomHeaderEventArgs e)
    {
        EventHandler<CustomHeaderEventArgs> handler = CustomHeaderTableCellCreated;

        // Event will be null if there are no subscribers
        if (handler != null)
        {
            // Use the () operator to raise the event.
            handler(this, e);
        }

    }

    protected override void OnRowCreated(GridViewRowEventArgs e)
    {
        if (ShowCustomHeader && e.Row.RowType == DataControlRowType.Header) return;
        base.OnRowCreated(e);
    }


    protected override void PrepareControlHierarchy()
    {
        //Do not show the Gridview header if show custom header is ON
        if (ShowCustomHeader) this.ShowHeader = false;


        base.PrepareControlHierarchy();
        //Safety Check
        if (this.Controls.Count == 0)
            return;
        bool controlStyleCreated = this.ControlStyleCreated;
        Table table = (Table)this.Controls[0];

        int j = 0;
        if (CustomHeaderRows ==null )return ;

        foreach (TableRow tr in CustomHeaderRows)
        {
            OnCustomHeaderTableCellCreated(new CustomHeaderEventArgs(tr,j));
            table.Rows.AddAt(j, tr);
            tr.ApplyStyle(this.HeaderStyle);
            j++;
        }


    }
}

public class GridViewPlusCustomHeaderRows : System.Collections.CollectionBase
{
    public GridViewPlusCustomHeaderRows()
    {
    }

    public void Add(TableRow aGridViewCustomRow)
    {
        List.Add(aGridViewCustomRow);
    }

    public void Remove(int index)
    {
        // Check to see if there is a widget at the supplied index.
        if (index > Count - 1 || index < 0)
        // If no widget exists, a messagebox is shown and the operation 
        // is cancelled.
        {
            throw (new Exception("Index not valid"));
        }
        else
        {
            List.RemoveAt(index);
        }
    }

    public TableRow Item(int Index)
    {
        // The appropriate item is retrieved from the List object and
        // explicitly cast to the Widget type, then returned to the 
        // caller.
        return (TableRow)List[Index];
    }

}


public class CustomHeaderEventArgs : EventArgs
{
    public CustomHeaderEventArgs(TableRow tr ,int RowNumber  )
    {
        tRow = tr;
        _rownumber = RowNumber;
    }
    private TableRow tRow;
    private int _rownumber = 0;


    public int RowNumber { get { return _rownumber; } }

    public TableRow HeaderRow
    {
        get { return tRow; }
        set { tRow = value; }
    }


}


public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Example1();
        GridViewExtension1.CustomHeaderTableCellCreated += new EventHandler<CustomHeaderEventArgs>(GridViewExtension1_CustomHeaderTableCellCreated);
    }

    void GridViewExtension1_CustomHeaderTableCellCreated(object sender, CustomHeaderEventArgs e)
    {
        TableRow tc = (TableRow)e.HeaderRow;

        tc.BackColor = System.Drawing.Color.AliceBlue;
    }

    private void Example1()
    {
        System.Data.DataTable dtSample = new DataTable();
        DataColumn dc1 = new DataColumn("Column1",typeof(string));
        DataColumn dc2 = new DataColumn("Column2",typeof(string));
        DataColumn dc3 = new DataColumn("Column3",typeof(string));
        DataColumn dc4 = new DataColumn("Column4",typeof(string));
       // DataColumn dc5 = new DataColumn("Column5",typeof(string));
        dtSample.Columns.Add(dc1);
        dtSample.Columns.Add(dc2);
        dtSample.Columns.Add(dc3);
        dtSample.Columns.Add(dc4);
       // dtSample.Columns.Add(dc5);
        dtSample.AcceptChanges();

        for (int i = 0; i < 25; i++)
        {
            DataRow dr = dtSample.NewRow();

            for (int j = 0; j < dtSample.Columns.Count; j++)
            {
                dr[j] = j;
            }
            dtSample.Rows.Add(dr);
        }
        dtSample.AcceptChanges();
        //GridViewExtension1.ShowHeader = false;
        GridViewExtension1.ShowCustomHeader = true;

        /*
         *=======================================================================
         *  |Row 1 Cell 1   |   Row 1 Col 2 (Span=2)        | Row 1 Col 3   |
         *  |               |                               |               |
         *=======================================================================             
         *  |Row 2 Cell 1   |               |               |               |
         *  |               |   Row 2 Col 2 | Row 2 Col 3   |Row 2 Col 4    |
         *=======================================================================
         * 
         * 
         * 
         * 
         * */

        // SO we have to make 2 header row as shown above

        TableRow TR1 = new TableRow();
        TableCell tcR1C1 = new TableCell();
        tcR1C1.Text = "Row 1 Cell 1";
        tcR1C1.ColumnSpan = 1;
        TR1.Cells.Add(tcR1C1);       

        TableCell tcR1C2 = new TableCell();
        tcR1C2.Text = "Row 1 Cell 2";
        tcR1C2.ColumnSpan = 2;
        TR1.Cells.Add(tcR1C2);  

        TableCell tcR1C3 = new TableCell();
        tcR1C3.Text = "Row 1 Cell 3";
        tcR1C3.ColumnSpan = 1;
        TR1.Cells.Add(tcR1C3);


        GridViewExtension1.CustomHeaderRows.Add(TR1);

        TableRow TR2 = new TableRow();
        TableCell tcR2C1 = new TableCell();
        tcR2C1.Text = "Row 2 Cell 1";
        tcR2C1.ColumnSpan = 1;
        TR2.Cells.Add(tcR2C1);

        TableCell tcR2C2 = new TableCell();
        tcR2C2.Text = "Row 2 Cell 2";
        tcR2C2.ColumnSpan = 1;
        TR2.Cells.Add(tcR2C2);

        TableCell tcR2C3 = new TableCell();
        tcR2C3.Text = "Row 2 Cell 3";
        tcR2C3.ColumnSpan = 1;
        TR2.Cells.Add(tcR2C3);

        TableCell tcR2C4 = new TableCell();
        tcR2C4.Text = "Row 2 Cell 4";
        tcR2C4.ColumnSpan = 1;
        TR2.Cells.Add(tcR2C4);

        GridViewExtension1.CustomHeaderRows.Add(TR2);


        GridViewExtension1.DataSource = dtSample;
        GridViewExtension1.DataBind();

    }
}

Answer 7

看一下这篇文章Dynamic Multiple Row Column Grid Header

Answer 8

我想做一个类似的任务，但是在标题内部需要可点击的按钮 - 在这种情况下没有上述工作，因为事件处理程序没有连线（由于事件的排序）。最后，我在网格视图的相应模板字段中使用了headertemplate标记。 html看起来有点臃肿，但事件保持不变，没有额外的代码支持。例如

<asp:TemplateField >
             <HeaderTemplate>
               <div>
                <div style="text-align: center;padding-bottom: 5px;">
                                                          text
                   </div>
                    <div>
                     <asp:Button ID="Button1" runat="server" Text="Apply to all" ToolTip="Apply to all - Special Bolt On" CssClass="sub_button input_btn_5" OnClick="ApplyButton1_Click" />
                   </div>
                  </div>
                  </HeaderTemplate>
                  <ItemTemplate>....

ASP.NET GridView第二个标题行跨越主标题行

8 个答案: