Convert String to Nullable DateTime [duplicate]

问题

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Closed 7 years ago.

Possible Duplicate:
How do I use DateTime.TryParse with a Nullable<DateTime>?

I have this line of code

DateTime? dt = Condition == true ? (DateTime?)Convert.ToDateTime(stringDate) : null;

Is this the correct way to convert string to Nullable DateTime, or is there a direct method to convert without converting it to DateTime and again casting it to Nullable DateTime?

回答1:

You can try this:-

 DateTime? dt = string.IsNullOrEmpty(date) ? (DateTime?)null : DateTime.Parse(date);

回答2:

You are able to build a method to do this:

public static DateTime? TryParse(string stringDate)
{
    DateTime date;
    return DateTime.TryParse(stringDate, out date) ? date : (DateTime?)null;
}

回答3:

DateTime? dt = (String.IsNullOrEmpty(stringData) ? (DateTime?)null : DateTime.Parse(dateString));

回答4:

Simply assigned without cast at all :)

DateTime? dt = Condition == true ? Convert.ToDateTime(stringDate) : null;

来源：https://stackoverflow.com/questions/13247273/convert-string-to-nullable-datetime