[英]How to keep the checkbox inside gridview checked based on certain condition?
[英]How to insert 0 or 1 in a database field if checkbox inside the gridview is checked?
我的Web表单上有一个gridview,并且我在gridview的模板字段中选中了复选框。 我希望如果在gridview中选中该复选框,它将在我的数据库列中插入1,如果未选中,则应插入0,即默认情况下该字段应插入0。我已经尝试过这样做-My aspx页面 -
<asp:GridView ID="GridMain" runat="server" Width="1000px"
AutoGenerateColumns="False">
<Columns>
<asp:TemplateField HeaderText="Student Name">
<ItemTemplate>
<asp:Label ID="lblname" runat="server" Text='<%# Eval("name") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Enable/Disable">
<ItemTemplate>
<asp:CheckBox ID="chkenbl" runat="server" AutoPostBack="True"
oncheckedchanged="chkenbl_CheckedChanged" />
<br />
<asp:Label ID="Label1" runat="server" Text='<%# Eval("id") %>' Visible="False"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
我的CS页面-
public void show()
{
try
{
dt = g1.return_dt("select id,name from tbl_data_show where en_dis='0' order by name");
if (dt.Rows.Count > 0)
{
adsource = new PagedDataSource();
adsource.DataSource = dt.DefaultView;
adsource.PageSize = 5;
GridMain.DataSource = adsource;
GridMain.DataBind();
}
}
catch (Exception ex)
{
Response.Write(ex.ToString());
}
}
protected void chkenbl_CheckedChanged(object sender, EventArgs e)
{
foreach (GridViewRow row in GridMain.Rows)
{
CheckBox chk = sender as CheckBox;
if (chk.Checked)
{
try
{
//Label lblid = (Label)GridMain.FindControl("Label1");
Label lblid = new Label();
lblid.Text = GridMain.FindControl("Label1").ToString();
rows=g1.ExecDB("insert into tbl_data_show(en_dis) values('1') where id="+lblid.Text);
if (rows > 0)
{
Response.Write("Rows Effected Successfull.");
}
}
catch (Exception ex)
{
Response.Write(ex.ToString());
}
}
else
{
//Label lblid1 = (Label)GridMain.FindControl("Label1");
Label lblid1 = new Label();
lblid1.Text = GridMain.FindControl("Label1").ToString();
rows=g1.ExecDB("insert into tbl_data_show(en_dis) values('0') where id="+lblid1.Text);
if (rows > 0)
{
Response.Write("Rows Effected Successfull.");
}
}
}
}
请指导我哪里出问题了。 我收到此异常“对象引用未设置为对象的实例。”。
好了,现在在获得一些详细信息之后,我可以告诉您:1)您的复选框具有autopostback = true,这将导致在每次单击复选框时回发。 在代码隐藏周期中,引发所有行并进行更新,因此,每次单击任何复选框时,都将更新所有行。 2)要获取Label.Text值,您可以尝试执行以下操作:
CheckBox chkStatus = (CheckBox)sender;
GridViewRow row = (GridViewRow)chkStatus.NamingContainer;
Label lbl = (Label)row.FindControl("Label1");
string lblTxt = lbl.Text;
或者,您可以将自定义属性添加到您的复选框(rid =“ <%#Eval(” id“)%>”)并获取其值,而不用隐藏标签:
string id = ((CheckBox)sender).Attributes["rid"].ToString();
if(chkenbl.IsChecked)
{
insert 1..
}
else
{
insert 0..
}
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