Nullable object must have a value

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class tblEmpMaster: this table class is generated from entity framework, in db the column Resignation_Date is nullable.

public class Employee{ public DateTime? Resignation_Date { get; set; }}

public Nullable<System.DateTime> Resignation_Date { get; set; }

emp.Resignation_Date = (DateTime)tbl.Resignation_Date;/// Getting error here

How do I handle when in db column Resignation_Date is having null value?

What I have tried:

I am new to this concept, pls help

Posted 5-Dec-20 1:00am

Virendra S from Bangalore, Karnataka

Updated 5-Dec-20 1:18am

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Solution 2

Adding to F-ES Sitecore's answer, you could look into the GetValueOrDefault method.

C#

emp.Resignation_Date = tbl.Resignation_Date.GetValueOrDefault(); // Default is MinDate.
emp.Resignation_Date = tbl.Resignation_Date.GetValueOrDefault(DateTime.Today); // Default is today.

Basically, you'll just have to decide what you want to do when the database returns null, or in other words, not a date.

Posted 5-Dec-20 1:18am

Sander Rossel

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F-ES Sitecore · Accepted Answer · 2020-12-05T01:10:00

It depends what you want to do when the date is null. You can check if it is null via

C#

Resignation_Date.HasValue

So you can do something like

C#

if (tbl.Resignation_Date.HasValue)
{
    emp.Resignation_Date = (DateTime)tbl.Resignation_Date;
}

but if emp.Resignation_Date isn't nullable you'll need to decide what value to give it when there is null, you could maybe use DateTime.MinValue.

Or if emp.Resignation_Date is also nullable then

C#

emp.Resignation_Date = tbl.Resignation_Date;