cannot convert string to target type system nullable datetime

Question

public DateTime? SubscriptionStartDate { get; set; }

I want the datetime in string format after it has mapped a value:

SubscriptionStartDate = sheet.AUDIT_SHEET_SUBSCRIPTION_START_DATE

But i cant convert it to a string. I get the exception in my topic. I think i need to convert it to a non-nullable datetime object using the ?? operator, but im not sure how, since i never used it.

Hang on - you're assigning to SubscriptionStartDate... that means converting to a datetime, not from a datetime. It's not clear what you're really trying to do at the moment... — Jon Skeet
– Jon Skeet, Commented Oct 25, 2011 at 10:31
Which is it? Converting to a string or converting from a string? — ChrisF
– ChrisF, Commented Oct 25, 2011 at 10:32
Can you update the title to match the body of the question then. — ChrisF
– ChrisF, Commented Oct 25, 2011 at 10:46

Ross Dargan · Accepted Answer · 2011-10-25 10:31:11Z

2

you need to check it has a value, then you can get the tostring from it. e.g.:-

if(SubscriptionStartDate.HasValue)
{
    String myValue = SubscriptionStartDate.Value.ToString();
}

answered Oct 25, 2011 at 10:31

Ross Dargan

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Aimeast · Accepted Answer · 2011-10-25 10:39:47Z

2

It is easy to use + operator

public DateTime? SubscriptionStartDate { get; set; }

string result = "" + SubscriptionStartDate

answered Oct 25, 2011 at 10:39

Aimeast

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Comments

Martin · Accepted Answer · 2011-10-25 10:33:36Z

0

Not sure this is a nullable issue per say.

Try (making sure to check for null first):

SubscriptionStartDate.parse( sheet.AUDIT_SHEET_SUBSCRIPTION_START_DATE )

( assuming you are retrieving a string and trying to assign a DateTime.... )

answered Oct 25, 2011 at 10:33

Martin

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2 Comments

Johan Over a year ago

Im not recieving a string, im recieving a DateTime? and i want to convert it to a string.

Johan Over a year ago

SOrry, didnt see my typo, should be the opposite in the topic

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