当DropDownList筛选器的值不是ALL时，如何删除GridView中的整个第一列
本文关键字：GridView 删除 一列 何删除 筛选 DropDownList ALL | 更新日期: 2023-09-27 18:20:19
我有以下复杂的asp.net代码结构：
- 下拉列表作为筛选器
- 中继器
- 在中继器内部：我有HiddenField和GridView
我希望当Filter的值设置为All时，第一列应该被删除。问题是我使用的StoredProcedure负责生成三个GridView，这样我就把GridView放在了Repeater中。
ASP.NET代码：
<asp:DropDownList ID="ddlDivision" runat="server" AppendDataBoundItems="True"
AutoPostBack="True" DataSourceID="sqlDataSourceDivision" DataTextField="DivisionName"
DataValueField="DivisionName"
Width="275px" EnableViewState="False">
<asp:ListItem Value="%">All</asp:ListItem>
</asp:DropDownList>
<br /> <br />
<asp:Repeater ID="Repeater1" runat="server" DataSourceID="SqlDataSource1">
<ItemTemplate>
<asp:HiddenField ID="HiddenField1" runat="server" Value='<%# Eval("GroupID")%>' />
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:testConnectionString %>"
SelectCommandType="StoredProcedure" SelectCommand="kbiReport"
FilterExpression="[DivisionName] like '{0}%'">
<FilterParameters>
<asp:ControlParameter ControlID="ddlDivision" Name="DivisionName"
PropertyName="SelectedValue" Type="String" />
</FilterParameters>
<SelectParameters>
<%--ControlParameter is linked to the HiddenField above to generate different GridView based on different values
of GroupID--%>
<asp:ControlParameter ControlID="HiddenField1" Name="GroupID" PropertyName="Value" />
</SelectParameters>
</asp:SqlDataSource>
<div style="width:700px; overflow:auto; overflow-y:hidden;">
<asp:GridView ID="GridView1" runat="server"
AllowSorting="True"
CellPadding="3"
DataSourceID="SqlDataSource1"
ClientIDMode="Static" class="fixedTables" Width="600" AutoGenerateColumns="true"
AlternatingRowStyle-CssClass="alt"
RowStyle-HorizontalAlign="Center"
OnRowDataBound="GridView1_RowDataBound" OnPreRender="GridView1_PreRender" OnRowCreated="GridView1_RowCreated"
OnDataBound="GridView1_DataBound">
<AlternatingRowStyle BackColor="White" ForeColor="#284775" />
<HeaderStyle Font-Bold = "true" ForeColor="Black"/>
<Columns>
</Columns>
<EditRowStyle BackColor="#999999" />
<FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
<PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
<RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
<SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
<SortedAscendingCellStyle BackColor="#E9E7E2" />
<SortedAscendingHeaderStyle BackColor="#506C8C" />
<SortedDescendingCellStyle BackColor="#FFFDF8" />
<SortedDescendingHeaderStyle BackColor="#6F8DAE" />
</asp:GridView>
</div>
<br />
</ItemTemplate>
</asp:Repeater>
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:testConnectionString %>"
SelectCommand="SELECT DISTINCT GroupID FROM courses">
</asp:SqlDataSource>
<%--Filtering by Division--%>
<asp:SqlDataSource ID="sqlDataSourceDivision" runat="server"
ConnectionString="<%$ ConnectionStrings:testConnectionString %>"
SelectCommand="SELECT [DivisionName] FROM [Divisions]"></asp:SqlDataSource>
背后的代码：
protected void Page_Load(object sender, EventArgs e)
{
//Repeater1.DataBind();
}
//protected void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e)
//{
// if (e.Item.ItemType == ListItemType.AlternatingItem || e.Item.ItemType == ListItemType.Item)
// {
// GridView gv = e.Item.FindControl("GridView1") as GridView;
// if (gv != null)
// {
// gv.DataBind();
// if (ddlDivision.SelectedValue != "ALL")
// {
// if (gv.Columns.Count > 0)
// gv.Columns[0].Visible = false;
// else
// {
// gv.HeaderRow.Cells[0].Visible = false;
// foreach (GridViewRow gvr in gv.Rows)
// {
// gvr.Cells[0].Visible = false;
// }
// }
// }
// }
// }
//}
//protected void ddlDivision_SelectedIndexChanged(object sender, EventArgs e)
//{
// if (ddlDivision.SelectedItem.Text == "All")
// {
// GridView1.Columns[0].Visible = true;
// }
// else
// {
// GridView1.Columns[0].Visible = false;
// }
//}
//This method is for deleting the first column in the GridView
protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e)
{
// e.Row.Cells[0].Visible = false; // hides the first column
}
protected void GridView1_DataBound(object sender, EventArgs e)
{
//GridView GridView1 = (GridView)sender;
//foreach (GridViewRow gvr in GridView1.Rows)
//{
// if (ddlDivision.SelectedValue != "All")
// {
// gvr.Cells[0].Visible = false;
// }
//}
}
//This function is for checking each cell in each row.
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
//var gv = sender as GridView;
//if (ddlDivision.SelectedValue == "All")
// gv.Columns[0].Visible = false;
if (e.Row.RowType == DataControlRowType.DataRow)
{
foreach (TableCell c in e.Row.Cells)
{
// Check if the cell vlaue = Yes
// if it is Yes, the cell will be colored with Light Green
if (c.Text.Contains(", Yes"))
{
c.BackColor = System.Drawing.Color.LightGreen;
c.Text = "•";
}
else if (c.Text.Contains(", NO"))
{
c.Text = "";
}
}
}
//The following is for changing the color of headers in each GridView based on the value of the HiddenFild
//BTW, the value of the HiddenField is the value of the GroupID in Group Table in the Database
else if (e.Row.RowType == DataControlRowType.Header)
{
switch (((HiddenField)((GridView)sender).Parent.FindControl("HiddenField1")).Value)
{
case "1":
for (int i = 4; i < e.Row.Cells.Count; i++)
e.Row.Cells[i].BackColor = System.Drawing.Color.LightBlue;
break;
case "2":
for (int i = 4; i < e.Row.Cells.Count; i++)
e.Row.Cells[i].BackColor = System.Drawing.Color.LightYellow;
break;
case "3":
for (int i = 4; i < e.Row.Cells.Count; i++)
e.Row.Cells[i].BackColor = System.Drawing.Color.Orange;
break;
}
}
}
protected void GridView1_PreRender(object sender, EventArgs e)
{
var gv = sender as GridView;
if (gv.Rows.Count > 0)
{
gv.UseAccessibleHeader = true;
gv.HeaderRow.TableSection = TableRowSection.TableHeader;
}
}
我做了很多尝试，但都失败了，正如你在上面的代码后面看到的那样。最后一次尝试是：
protected void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.AlternatingItem || e.Item.ItemType == ListItemType.Item)
{
GridView gv = e.Item.FindControl("GridView1") as GridView;
if (gv != null)
{
gv.DataBind();
if (ddlDivision.SelectedValue != "ALL")
{
if (gv.Columns.Count > 0)
gv.Columns[0].Visible = false;
else
{
gv.HeaderRow.Cells[0].Visible = false;
foreach (GridViewRow gvr in gv.Rows)
{
gvr.Cells[0].Visible = false;
}
}
}
}
}
}
我失败了有人能帮我解决这个问题吗
我希望当Filter的值设置为All时，第一列应移除。
如果是这样的话，你肯定想要这个：
if (ddlDivision.SelectedValue == "ALL") { // hide column 0 }
而不是这个：
if (ddlDivision.SelectedValue != "ALL") { // hide column 0 }
假设对gv对象有正确的引用，并且GridView的AutoGenerateColumns属性设置为false，则使用gv.Columns[0].Visible = false;应该可以正常工作。
您必须确保这一点，因为AutoGenerateColumns="true"是GridView的默认值，在这种情况下，GridView.Columns.Count将始终为0。如果您尝试引用.Columns[x]，它将抛出一个"索引超出范围"例外
更多信息请点击此处：https://stackoverflow.com/a/3819831/441574
更新：
当您使用AutoGenerateColumns="true"时，您可以使用GridView:的RowDataBound事件来隐藏列
创建事件处理程序：
如果您的GridView是静态（在.aspx页面上声明），请将其添加到声明中：OnRowDataBound="gv_RowDataBound"
如果您的GridView是用程序创建的，请添加RowDataBound事件处理程序：gv.RowDataBound += new GridViewRowEventHandler(gv_RowDataBound);
然后添加您的RowDataBound事件：
protected void gv_RowDataBound(object sender, GridViewRowEventArgs e)
{
...
if (e.Row.RowType != DataControlRowType.Pager)
{
if (ddlDivision.SelectedItem.Text != "ALL")
{
// only check for pager row, all other rows including header/footer should be hidden
e.Row.Cells[0].Visible = false;
}
}
...
}