Question

如果没有数据，我想动态隐藏gridview列。有一列，即我想隐藏的附件，但不幸的是编码有问题，但我无法找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;     
        }

    }
}

此代码无法正常显示该列请帮忙

Answer 1

你做不到。它类似于删除人们不在装配中的特定列。它会搞砸阵型。

GridView呈现为表格（HTML）。如果您查看来源，则每个td都会看到一个包含10 tr的表格。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，如果第10列的任何行中没有数据，则可以隐藏它。但是RowDataBound不是那个事件。在GridView1.DataBind()之后执行此操作。

Answer 2

If you set the Visible property before calling DataBind, then it also reduces ViewState slightly as the values are never populated into invisible columns.

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();
}

没有数据时如何隐藏Gridview的列？

2 个答案: