可空对象必须具有使用C＃错误的值datetime

Question

I am facing one problem in c# datetime i have trying more than time. it's not giving a problem solution. so give me one solution.

var accommodationcategoryList = EmployeeAttendanceCacheMaster.GetAllEmployeeAttendance();
DataSourceResult result = accommodationcategoryList.ToDataSourceResult(request);

foreach(var item in accommodationcategoryList)
{
    item.User = UserCacheMaster.GetUserById(item.employeeid);
    item.loginTime = item.login.Value.ToShortDateString();
    item.logoutTime = (item.logout.Value.ToShortDateString() != null) ? item.logout.Value.ToShortDateString() : "-";
}

My problem is not showing the logouttime it showing error looks like

nullable object must have a value

Answer 1

You're trying to check if a conversion against the null object is null rather than checking the nullable object itself. You need to change this line:

item.logoutTime = (item.logout.Value.ToShortDateString() != null) ? item.logout.Value.ToShortDateString() : "-";

to

item.logoutTime = item.logout.HasValue ? item.logout.Value.ToShortDateString() : "-";

Answer 2

Try this:

if(item.logout.HasValue) {
    item.logoutTime = item.logout.Value;
}