如何在没有数据的情况下隐藏Gridview的列

本文关键字:情况下 隐藏 Gridview 的列 数据 | 更新日期: 2023-09-27 17:50:32

如果没有数据,我想动态隐藏gridview的列。有一个列,即附件,我想隐藏它,但不幸的是,编码有问题,但我找不到它以下是我的代码

<asp:GridView ID="GridView1" CssClass="attengrid" runat="server" Width="100%" AutoGenerateColumns="false"
                        ShowHeader="true" onrowdatabound="GridView1_RowDataBound">
                        <Columns>
                            <asp:BoundField DataField="EmpName" HeaderText="Emp.Name"></asp:BoundField>
                            <asp:BoundField DataField="DOB" HeaderText="DOB"></asp:BoundField>
                            <asp:BoundField DataField="Qualification" HeaderText="Designation"></asp:BoundField>
                            <asp:BoundField DataField="HomePlace" HeaderText="Home Town"></asp:BoundField>
                            <asp:BoundField DataField="DOJInGovrService" HeaderText="DOJ In Gov.Service"></asp:BoundField>
                            <asp:BoundField DataField="DOJInSamvarg" HeaderText="DOJ In Samvarg"></asp:BoundField>
                            <asp:BoundField DataField="DOJInCurrentOff" HeaderText="DOJ In Current Off."></asp:BoundField>
                            <asp:BoundField DataField="CurrentOfficePlace" HeaderText="Current Office"></asp:BoundField>
                            <asp:BoundField DataField="class" HeaderText="Category"></asp:BoundField>
                            <asp:BoundField DataField="Attachment" HeaderText="Attachment"></asp:BoundField>
                        </Columns>
                    </asp:GridView>

以下是.aspx.cs

 protected void btnSearch_Click(object sender, EventArgs e)
{
    dbAccess.execute("select ED.class,ED.CurrentOfficePlace,ED.DOB,ED.DOJInCurrentOff,ED.DOJInGovrService,ED.DOJInSamvarg,ED.EmpName,ED.HomePlace,ED.Qualification, ED.Attachment from tbl_EmplyeesBiodata ED where ED.CurrentOfficePlace='" + ddlCurrentPlacePosting.SelectedItem.Text + "'", DBAccess.SQLType.IS_QUERY);
    DataTable dt = dbAccess.records1();
    if (dt.Rows.Count > 0)
    {
        Label8.Text = dt.Rows.Count.ToString();
        GridView1.DataSource = dt;
        GridView1.DataBind();
        lblmsg.Style.Add("display", "block");
        lblmsg.Attributes.Add("class", "success");
        lblmsg.InnerHtml = closediv + "Case Found";
        tdnotice.Style.Add("display", "block");
    }
    else
    {
        lblmsg.Style.Add("display", "block");
        lblmsg.Attributes.Add("class", "error");
        lblmsg.InnerHtml = closediv + "No Case Found";
        tdnotice.Style.Add("display", "none");
    }
}

 protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        string val = e.Row.Cells[9].ToString();  
        if (string.IsNullOrEmpty(val))
        {
            GridView1.Columns[9].Visible = false;     
        }
    }
}

此代码不起作用,它仍在显示列请帮助

如何在没有数据的情况下隐藏Gridview的列

您不能这样做。这类似于删除程序集中没有人员的特定列。它会把队形搞砸。

GridView被呈现为一个表(HTML(。如果查看源,则可以看到一个表,其中每个tr包含10个td。这意味着每行10列。现在,您希望有条件地隐藏某些行中的一列。

现在,如果你在第10列的任何一行中都没有数据,你可以隐藏它。但RowDataBound不是这样的事件。在GridView1.DataBind()之后再做。

如果在调用DataBind之前设置Visible属性,那么它也会略微降低ViewState,因为这些值从未填充到不可见列中。

protected void btnSearch_Click(object sender, EventArgs e) {
// .....
bool isBlank = true;
foreach (DataRow dr in dt.Rows) { // for each row in the data table
    if (!dr.item("Attachment") == System.DbNull.Value) { // if we find a non null value
        isBlank = false; // show the column in the gridview
        break; // then stop checking for nulls
    }
}
GridView1.Columns(9).Visible = !isBlank;
GridView1.DataBind();
}