Question

无法将类型为"System.Windows.Forms.TextBox"的对象强制转换为类型"System.IConvertible".

DateTimePicker dtp2 = new DateTimePicker();
dateTimePicker1.Format = DateTimePickerFormat.Long;
DateTime dt2 = Convert.ToDateTime(dtp2);

DateTimePicker dtp3 = new DateTimePicker();
dateTimePicker2.Format = DateTimePickerFormat.Long;
DateTime dt3 = Convert.ToDateTime(dtp3);

TimeSpan ts = dt2 - dt3;
string aw = Convert.ToString(ts.TotalDays);
textBox2.Text = aw;

Answer 1

DateTime dt2 = Convert.ToDateTime(dtp2);

DateTime dt3 = Convert.ToDateTime(dtp3);

这两句，怎么能把时间选择控件转换成日期时间呢，试下：
DateTime dt2 = dtp2.Value;