Question

我有一个gridview，其中我有10列。在10个我有5列的名称命名为Ata，Hplan，Hosp，其他（这4个是复选框），Othercolor（Boundfield）和Alta，Hplan等等..现在我想在用户下拉选择中添加5列或全部10 ..我需要禁用gridview的viewstate吗？我怎样才能实现这一点......第二个问题是如何在行数据绑定期间动态绑定这些列event.Basic的事情是我希望gridview列名重复，但在datatable中我不能给出重复的列名。请帮助..

protected void Btnshow_Click(object sender, EventArgs e)
        {
            if (DropDownList1.SelectedIndex==1)
            {
                dtgridbind.Columns.AddRange(new DataColumn[10] { new DataColumn("1_ALta", typeof(bool)),new DataColumn("1_Hplan", typeof(bool)),
                            new DataColumn("1_Hosp",typeof(bool)),new DataColumn("1_other",typeof(bool)),new DataColumn("1_othercolor",typeof(string)),
                            new DataColumn("2_ALta", typeof(bool)),new DataColumn("2_Hplan", typeof(bool)),
                            new DataColumn("2_Hosp",typeof(bool)),new DataColumn("2_other",typeof(bool)),new DataColumn("2_othercolor",typeof(string))});
                dtgridbind.Rows.Add(true, false, false, false, "N/A", false, true, false, false, "Red");
                dtgridbind.Rows.Add(true, false, false, false, "N/A", false, true, false, false, "Red");
                dtgridbind.Rows.Add(true, false, false, false, "N/A", false, true, false, false, "Red");
                GridView1.DataSource = dtgridbind;
                GridView1.DataBind();
               // ViewState["modechange"] = 1;
            }
            else
            {
                dtgridbind.Columns.AddRange(new DataColumn[5] { new DataColumn("1_ALta", typeof(bool)),new DataColumn("1_Hplan", typeof(bool)),
                            new DataColumn("1_Hosp",typeof(bool)),new DataColumn("1_other",typeof(bool)),new DataColumn("1_othercolor",typeof(string))});
                dtgridbind.Rows.Add(true, false, false, false, "N/A");
                dtgridbind.Rows.Add(true, false, false, false, "N/A");
                dtgridbind.Rows.Add(true, false, false, false, "Red");
              //  ViewState["grid"] = dtgridbind;
                GridView1.DataSource = dtgridbind;
                GridView1.DataBind();
            }
        }

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            if (e.Row.RowType == DataControlRowType.Header)
            {

                foreach (DataColumn datacol in dtgridbind.Columns)
                {
                    if (datacol.ColumnName.Contains("_othercolor"))
                    {
                        BoundField bfield = new BoundField();
                        bfield.HeaderText = datacol.ColumnName.Substring(2, datacol.ColumnName.Length - 2);
                        bfield.DataField = datacol.ColumnName;
                        GridView1.Columns.Add(bfield);
                    }

                    else
                    {
                        CheckBoxField ck = new CheckBoxField();
                        ck.HeaderText = datacol.ColumnName.Substring(2, datacol.ColumnName.Length - 2);
                        ck.DataField = datacol.ColumnName;
                        GridView1.Columns.Add(ck);





                    }
                }
            }

Answer 1

此代码是否符合您的要求？在此代码中，有一个包含两个值的下拉列表。如果选择“10列”，它将回发并将10列添加到数据表中。如果选择“5列”，它将回发并将5列添加到数据表中。

在OnRowDataBound中，它循环遍历标题单元格，并根据“_”字符拆分文本。然后是第二部分。这仅在您遵循列的命名约定时才有效。

您不能拥有具有相同列名的datacolumns。要解决这个问题，您可以使用OnRowDataBound，只需更改单元格文本，如上所述。

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
        <asp:DropDownList ID="DropDownList1" runat="server" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged" AutoPostBack="true">
            <asp:ListItem Text="" Value =""></asp:ListItem>
            <asp:ListItem Text="10 Columns" Value ="1"></asp:ListItem>
            <asp:ListItem Text="5 Columns" Value ="2"></asp:ListItem>
        </asp:DropDownList>
        <asp:GridView runat="server" ID="GridView1" OnRowDataBound="GridView1_RowDataBound"></asp:GridView>
    </form>
</body>
</html>


public partial class WebForm3 : System.Web.UI.Page
    {
        private DataTable dtgridbind = new DataTable();
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            if (e.Row.RowType == DataControlRowType.Header)
            {
                foreach (TableCell headerCell in e.Row.Cells)
                {
                    headerCell.Text = headerCell.Text.Split('_')[1]; 
                }
            }
        }

        protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (DropDownList1.SelectedIndex == 1)
            {
                dtgridbind.Columns.AddRange(new DataColumn[10] { new DataColumn("1_ALta", typeof(bool)),new DataColumn("1_Hplan", typeof(bool)),
                            new DataColumn("1_Hosp",typeof(bool)),new DataColumn("1_other",typeof(bool)),new DataColumn("1_othercolor",typeof(string)),
                            new DataColumn("2_ALta", typeof(bool)),new DataColumn("2_Hplan", typeof(bool)),
                            new DataColumn("2_Hosp",typeof(bool)),new DataColumn("2_other",typeof(bool)),new DataColumn("2_othercolor",typeof(string))});
                dtgridbind.Rows.Add(true, false, false, false, "N/A", false, true, false, false, "Red");
                dtgridbind.Rows.Add(true, false, false, false, "N/A", false, true, false, false, "Red");
                dtgridbind.Rows.Add(true, false, false, false, "N/A", false, true, false, false, "Red");
                GridView1.DataSource = dtgridbind;
                GridView1.DataBind();
            }
            else
            {
                dtgridbind.Columns.AddRange(new DataColumn[5] { new DataColumn("1_ALta", typeof(bool)),new DataColumn("1_Hplan", typeof(bool)),
                            new DataColumn("1_Hosp",typeof(bool)),new DataColumn("1_other",typeof(bool)),new DataColumn("1_othercolor",typeof(string))});
                dtgridbind.Rows.Add(true, false, false, false, "N/A");
                dtgridbind.Rows.Add(true, false, false, false, "N/A");
                dtgridbind.Rows.Add(true, false, false, false, "Red");
                GridView1.DataSource = dtgridbind;
                GridView1.DataBind();
            }
        }
    }

结果截图：

从asp.net中的动态数据表动态绑定gridview列

1 个答案: