Sort C# ArrayList with DateTime

Question

I have a C# ArrayList with objects that includes following fields. I have around 10 objects in the ArrayList. My problem is I need to sort the ArrayList based on the StartDate available in the system which is a DateTime variable.

public int id { get; set; }
public string title {get; set;}
public bool allDay { get; set; }
public string start { get; set; }
public string end { get; set; }
public string color { get; set; }
public DateTime startDate { get; set; }
public DateTime endDate { get; set; }
public string Location { get; set; }
public string StartDatestr { get; set; }
public string EndDatestr { get; set; }
public string StartTime { get; set; }
public string EndTime { get; set; }
public bool Alert { get; set; }
public bool Repeat { get; set; }
public Int32 RepeatDays { get; set; }
public Int32 CalendarID { get; set; }
public int CustomerNo { get; set; }
public string CustomerName { get; set; }
public bool IsProspect { get; set; }
public string Description { get; set; }

Can someone please enlighten me? I tried .Sort() but it just doesn’t do anything (its dump to try sort on ArrayList which has objects I know).

Thanks in advance.

Update:

List<Appointment> appointments = new List<Appointment>();

I created the List as above. Now can I sort it?

Do you really need ArrayList(unless say you are on 1.1), can't you use List<yourclass> ? — V4Vendetta
– V4Vendetta, Commented Dec 10, 2012 at 7:25
var sortedList = appointments.OrderBy(a=>a.startDate).ToList(); — L.B
– L.B, Commented Dec 10, 2012 at 8:13
i alredy answer that check my OR option in my answer you can make use of "OrderBy" to do it — Pranay Rana
– Pranay Rana, Commented Dec 10, 2012 at 8:17

Pranay Rana · Accepted Answer · 2012-12-10 08:17:53Z

6

Try by creating comparere like as below

public class ComparerDateTime : IComparer
{
    public int Compare(object x, object y)
    {
        MYCLASS X = x as MYCLASS;
        MYCLASS Y = y as MYCLASS;

        return X.date.CompareTo(Y.date);
    }
}

 MYCLASSList.Sort(new ComparerDateTime ());

OR

Create Generic collection than you can do this

give try to Enumerable.OrderBy operation will do work for you..you need to include linq for this

IEnumerable<Pet> query = arrayList .OrderBy(x=> x.startDate );

if list is created like as below than try linq option

List<MYCLASS> arrayList  = new List<MYCLASS>();

edited Dec 10, 2012 at 8:17

answered Dec 10, 2012 at 7:20

Pranay Rana

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4 Comments

Jon Skeet Over a year ago

That's not going to work on just ArrayList, which isn't generic.

Pranay Rana Over a year ago

@MayuMayooresan - i laredy answer that check my OR option in my answer you can make use of "OrderBy" to do it

Jaya Mayu Over a year ago

When I try OrderBy i'm getting an error

Error	4	'System.Collections.Generic.List<Rah.BusinessEntities.Appointment>' does not contain a definition for 'OrderBy' and no extension method 'OrderBy' accepting a first argument of type 'System.Collections.Generic.List<Rah.BusinessEntities.Appointment>' could be found (are you missing a using directive or an assembly reference?)

Pranay Rana Over a year ago

@MayuMayooresan - you need to add linq name space which is "using System.Linq;" ....

Pranay Rana · Accepted Answer · 2012-12-10 14:08:31Z

1

You should try making that set of properties into a single class and then create a generic List<NewClass> and you can then use IComparable and IComparer to sort by a particular field.

edited Dec 10, 2012 at 14:08

Pranay Rana

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answered Dec 10, 2012 at 7:33

Mechanik

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