How can I check the status of a checkbox inside a gridview?
I have a gridview, and I made a template column with a checkbox inside.
Then I want to check the value of checkboxes.
I'm trying to set the row's visible property to false when that row's checkbox is unselected.
I'm always getting null, no matter what I do.
It must be a problem with the FindControl(), but I think it is perfectly normal:
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
DbInteract dbi = new DbInteract("CONNECTION STRING");
GridView1.DataSource = dbi.SqlDA("select * from table");
GridView1.DataBind();
}
protected void ProsseguirBtn_Click(object sender, EventArgs e)
{
if (!IsPostBack)
{
foreach (GridViewRow row in GridView1.Rows)
{
CheckBox cb = (CheckBox)row.FindControl("chk");
if (!cb.Checked)
{
GridView1.Rows[row.RowIndex].Visible = false;
}
}
}
}
}
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False">
<Columns>
<asp:TemplateField>
<EditItemTemplate>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>开发者_如何学C;
</EditItemTemplate>
<ItemTemplate>
<asp:CheckBox ID="chk" runat="server" />
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="nome" HeaderText="jhf" />
</Columns>
</asp:GridView>
<asp:Button ID="ProsseguirBtn" runat="server" Text="Button"
onclick="ProsseguirBtn_Click" />
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
</div>
</form>
</body>
</html>
FindControl is not recursive. In other words, when you call FindControl on your row, it looks at only the immediate controls that the row contains.
A GridViewRow doesn't directly contain your controls - it contains table cells, which then contain your controls. So FindControl won't find your checkbox.
You'll need to use another method, like a foreach loop over the table cells if you don't know the column that you want, or write a recursive version of FindControl. You can find a version that I use sometimes in my old answer here.
Why do you require the check for !IsPostBack?
I have tried this code without this !IsPostBack check and the CheckBox is found correctly, otherwise IsPostBack is false and the code to find the CheckBox will not be hit.
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