Assigning null/Nullable to DateTime in Ternary Operation

问题

I have a statement like

DateTime ? dt = (string1 == string2) ? null; (DateTime)(txtbox.Text);

which I cannot compile. Reason is : null cannot be assigned to DateTime.

So, I have to declare a Nullable<DateTime> nullable variable and replace null with nullable.

I do not want to use if-statement and I want to do this in one line.

Also, Can I use operator ?? here.

回答1:

DateTime? dt = (string1 == string2) ? (DateTime?)null
                                    : DateTime.Parse(txtbox.Text);

回答2:

you can do it like that:

DateTime ? dt = (string1 == string2) ? new Nullable <DateTime>(): (DateTime)(txtbox.Text);

来源：https://stackoverflow.com/questions/6215199/assigning-null-nullable-to-datetime-in-ternary-operation