LINQ query to validate the selected day is not in a list of other dates

Question

Hi ,

I want to validate a selected date that does not fall in a list of dates from other table.

Basically when user selects a date from calendar,i need to validate that date is not in list of dates fetched from a table.

How can i acheive this via LINQ query?

Answer 1

Try something like this:

DateTime selected_date = . . .
IEnumerable<DateTime> list_of_dates = . . .

bool is_valid = !list_of_dates.Contains( selected_date );

If the time part is present and must be ignored:

bool is_valid = list_of_dates.All( d => d.Date != selected_date.Date );