我在回发之间遇到了GridView的行为问题。
真正的问题来自我在column[0]的标记中定义的带有子CheckBox控件的TemplateField。第一次和第二次搜索执行工作正常。但是,在第二次执行和之后导致回帖的任何事情之间的某个时刻,我丢失了 TemplateField 的内容。
它只是列的内容,而不是被删除的整个列本身。TemplateField 存在于源文件中,并在表格的位置 0 处显示一个格式化的列。
代码:
protected void ExecuteSearch(object sender, EventArgs e)
{
if (lb_SelectedFields.Items.Count == 0) { return; } //if no selected fields
//Generates custom SQL query based on user inputs and column Selections
BuildQuery(); // sets txbSqlText.Text = to the SQL string
DataTable Table = SqlAdapter.Select(new System.Data.SqlClient.SqlCommand(txbSqlText.Text));
for (int i = gv_SearchResults.Columns.Count - 1; i > 0; i--)
{ gv_SearchResults.Columns.RemoveAt(i); } //removes all the columns except[0]
foreach (ListItem Item in lb_SelectedFields.Items) //adds all the user defined columns
{
//Column object that is able to find the column definition
Column Col = ColumnsBasedOnFocus.FindColumName(Item.Value);
if (Col.Type == "HyperLink") { gv_SearchResults.Columns.Add(CreateHyperLinkField(Col)); }
else { gv_SearchResults.Columns.Add(CreateBoundColumn(Col, true)); } //true is if the column is visable
}
gv_SearchResults.DataSource = Table;
gv_SearchResults.DataBind();
}
ASP.NET:
<asp:GridView ID="gv_SearchResults" runat="server" GridLines="None" CellSpacing="0"
CellPadding="0" AutoGenerateColumns="false" CssClass="TABLE_LIGHTBLUE" Width="100%">
<HeaderStyle CssClass="TABLE_LIGHTBLUE_HEADERROW" />
<Columns>
<asp:TemplateField ItemStyle-Width="30" ItemStyle-Wrap="false">
<HeaderTemplate>
<center>
<asp:Button ID="btn_SelectAll" runat="server" OnClick="SelectAll" Text="All" CssClass="TEXT_SMALL" />
<asp:CheckBox ID="chk_Placeholder" runat="server" Visible="false" /></center>
</HeaderTemplate>
<ItemTemplate>
<center>
<asp:CheckBox ID="chk_Select" runat="server" Visible="true" />
<asp:Label ID="lbl_AssetGID" runat="server" Visible="false" Text='<%# Bind("i_GID") %>' /></center>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>