下拉列表中不能有多个选定项目 [英] Cannot have multiple selected items in dropdown list
本文介绍了下拉列表中不能有多个选定项目的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有三个日期,月份和年份的下拉列表和一个按钮。我收到了错误。我得到:不能在DropDownList中选择多个项目
I have three dropdownlist for date,month,and Year and a button. I am getting the error. I am getting:Cannot have multiple items selected in a DropDownList
protected void Page_Load(object sender, EventArgs e)
{
for (int month = 1; month < 13; month++)
{
ddlMonth.Items.Add(month.ToString());
}
ddlMonth.Items.FindByValue(System.DateTime.Now.Month.ToString()).Selected = true;
for (int year = 1947; year < 2015; year++)
{
ddlYear.Items.Add(year.ToString());
}
ddlYear.Items.FindByValue(System.DateTime.Now.Year.ToString()).Selected = true;
FillDays();
}
public void FillDays()
{
ddlDate.Items.Clear();
//getting number of days in selected month & year
int noofdays = DateTime.DaysInMonth(Convert.ToInt32(ddlYear.SelectedValue), Convert.ToInt32(ddlMonth.SelectedValue));
//Fill days
for (int i = 1; i <= noofdays; i++)
{
ddlDate.Items.Add(i.ToString());
}
ddlDate.Items.FindByValue(System.DateTime.Now.Day.ToString()).Selected = true;// Set current date as selected
}
protected void save_Click(object sender, EventArgs e)
{
SqlCommand cmd = new SqlCommand();
cmd.CommandText = "Insert_Reminder";
cmd.CommandType = CommandType.StoredProcedure;
string datestring = string.Format("{0}-{1}-{2}", ddlMonth.SelectedValue, ddlDate.SelectedValue.PadLeft(2, '0'), ddlYear.SelectedValue.PadLeft(2, '0'));
string timestring = ddlHour.SelectedValue +":"+ddlMinute.SelectedValue +":"+ddlsecond.SelectedValue;
cmd.Parameters.Add("@birthdate",SqlDbType.Date).Value=datestring;
cmd.Parameters.Add("@reminder_time", SqlDbType.Time).Value = timestring.Trim();
cmd.Parameters.Add("@reminder_detail", SqlDbType.Text).Value = txt_reminder.Text.Trim();
cmd.Connection=con;
try
{
con.Open();
cmd.ExecuteNonQuery();
Response.Write("<script>alert('Data Inserted Successfully')</script>");
}
catch(Exception ex)
{
Response.Write(ex.Message);
}
finally
{
con.Close();
con.Dispose();
}
}
推荐答案
ASP.NET DropDownList仅用于单选。您可以使用具有选择模式属性的ListBox,并可以选择乘法值...
从这里开始阅读: ASP.NET中的多选下拉列表 [ ^ ]
ASP.NET DropDownList is only for single selection. You may use ListBox which has property for selection mode and can select multiply values...
Start reading here: Multi select Dropdown list in ASP.NET[^]
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