当我选择一个特定的日期(如我在MonthCalendar中的代码中的代码)时,我会删除列表框中的某些项目,但是之后,当我在MonthCalendar中选择另一个日期时,我希望这些项目又回到列表框中,该怎么做?选择特定日期后,我无法取回这些物品。
private void monthCalendar1_DateChanged_1(object sender, DateRangeEventArgs e)
{
MyConn3 = new MySqlConnection(MyConnection3);
string mday= monthCalendar1.SelectionStart.Date.ToString("yyyyMMdd");
string test = ("select day, time, name from system where day='"+mday+"'");
cmd = new MySqlCommand(test, MyConn3);
MySqlDataReader MyReader2;
try
{
MyConn3.Open();
MyReader2 = cmd.ExecuteReader();
while (MyReader2.Read())
{
eDay = MyReader2.GetString("day");
eTime = MyReader2.GetString("time");
string namn = MyReader2.GetString("name");
if (eDay.Contains(mday))
{
Console.WriteLine("time " + eTime);
Console.WriteLine(eDay);
Console.WriteLine(eTime);
Console.WriteLine("test: " + mday);
listBox1.Items.Remove(eTime);
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
MyConn3.Close();
}
最佳答案
您需要在“ monthCalendar1_DateChanged_1”方法开始起作用之前保留listBox1的dataSource。
在方法开始时,必须将dataSource设置为listBox1,然后从listBox中删除项目。因此,代码将如下所示:
private List<string> myGlobalDataSource= new List<string>{"item1","item2"};
private void monthCalendar1_DateChanged_1(object sender, DateRangeEventArgs e)
{
listBox1.DataSource = myGlobalDataSource;
MyConn3 = new MySqlConnection(MyConnection3);
....
关于c# - 在MonthCalendar中选择特定日期后如何删除项目,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/35701892/