C# – How to Sort a List by a property in the object

cgenericslistsorting

I have a class called Order which has properties such as OrderId, OrderDate, Quantity, and Total. I have a list of this Order class:

List<Order> objListOrder = new List<Order>();
GetOrderList(objListOrder); // fill list of orders

Now I want to sort the list based on one property of the Order object, for example I need to sort it by the order date or order id.

How can i do this in C#?

Best Answer

The easiest way I can think of is to use Linq:

List<Order> SortedList = objListOrder.OrderBy(o=>o.OrderDate).ToList();

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Use LINQ:

Dictionary<string, int> myDict = new Dictionary<string, int>();
myDict.Add("one", 1);
myDict.Add("four", 4);
myDict.Add("two", 2);
myDict.Add("three", 3);

var sortedDict = from entry in myDict orderby entry.Value ascending select entry;

This would also allow for great flexibility in that you can select the top 10, 20 10%, etc. Or if you are using your word frequency index for type-ahead, you could also include StartsWith clause as well.

Python – How to check if a list is empty

if not a:
  print("List is empty")

Using the implicit booleanness of the empty list is quite pythonic.

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