可空的DateTime列表到不可空的DateTime列表

Question

I have a list of nullable date times. I need to filter it down to a non-nullable DateTime list by excuding the null values.

var d = NullableDateTimeList;
??//var nonNullableList = d.Where(p => p.DateX.HasValue).Select(p => p.Datex);

How do I go about doing this. Thanks.

Answer 1

very close, just add the .Value property when selecting the nullable DateTime :

var nonNullableList = d.Where( p => p.DateX.HasValue )
    .Select( p => p.DateX.Value )
    .ToList();

Answer 2

只需选择.Value

var nonNullableList = d.Where(p => p.DateX.HasValue).Select(p => p.DateX.Value);

Answer 3

You have to select the Vaue from the Nullable<DateTime> before you call ToList() :

List<DateTime> nonNulls = NullableDateTimeList
    .Where(d => d.DateX.HasValue)
    .Select(d => d.DateX.Value)
    .ToList();