如何通过比较列表中的实例将列表中的列表分为几部分

Question

suppose my list<struct>

in list some struct have the date 31 january

some have date 5 march

some have 12 august then

i want to make a list of all same date struct

how i can do this in c#

Answer 1

Assume your struct looks like this:

struct YourStruct 
{
    DateTime DateProperty { get; set; }
}

Then you can use GroupBy to get the dates:

List<YourStruct> list = ....;
var dates = list.GroupBy(s => s.DateProperty.Date);

Group by groups on unique values, so you need to group on the Date property of the DateTime instance. The code above will return an IEnumerable<IGrouping<DateTime>> , where the key of each group will be the corresponding date.