我尝试动态创建复选框 - 所有这些复选框都分配有 checkChanged 事件。
在事件处理程序中，我测试是否选中了复选框，如果是，我会在会话中破坏 value 属性。但这对我来说是一个大问题。
例如，客户决定选中一个复选框，并将其 value 属性添加到会话中，但随后他突然决定不希望选中该复选框并取消选中它 - 没关系，但该值将保留存储在会议，我不吃那个。那么当用户取消选中复选框时，有什么方法可以删除这个值
protected void btnProba_Click(objectore sender, EventArgs e)
{
lblProba.Text = ((String)Session["chk"]);
// lblProba.Text = pr.ToString();
}
protected void checkChanged(object sender, EventArgs e)
{
CheckBox chk = (CheckBox)sender;
if (chk.Checked)
{
//lblProba.Text += chk.Text;
//myche.Add(chk.Text);
Session["chk"] += chk.InputAttributes["value"];
}
}
protected void ddlNumberTourists_SelectedIndexChanged(object sender, EventArgs e)
{
chkddlchange = true;
int numTourists = Convert.ToInt32(ddlNumberTourists.SelectedItem.Text);
for (int i = 0; i < numTourists; i++)
{
string connectionString = "Server=localhost\\SQLEXPRESS;Database=excursion;Trusted_Connection=true";
string query =
"SELECT Extra_Charge_ID, Excursion_ID, Amout, Extra_Charge_Description FROM EXTRA_CHARGES WHERE Excursion_ID=" + mynewstring;
SqlConnection conn = new SqlConnection(connectionString);
SqlCommand cmd = new SqlCommand(query, conn);
try
{
conn.Open();
SqlDataReader rd= cmd.ExecuteReader();
int s = 0;
while (rd.Read())
{
CheckBox mycheckbox = new CheckBox();
mycheckbox.ID = "chkblextracharge" + i.ToString() + s.ToString();
mycheckbox.Text = rd["Extra_Charge_Description"].ToString();
mycheckbox.InputAttributes.Add("value", rd["Extra_Charge_ID"].ToString());
mycheckbox.AutoPostBack = true;
mycheckbox.CheckedChanged += new EventHandler(checkChanged);
Page.FindControl("form1").Controls.Add(mycheckbox);
}
}//End of try
catch (Exception ex)
{ }
}//end of for
}
}
}