Order list elements by properties sub properties

Question

A list should be ordered by a property which is sub property of a object in a list.

pList = pList
        .OrderBy(x => x.GetType()
            .GetProperty(sortBasedValue)
            .GetValue(x, null))
        .ToList();

Will sort all Elements in the list, but some subelements have multiple properties. Already tried subitem.value as sortBasedValue but will not work.

So `sortBasedValue` is a string like `"Name"` and you want to pass it a chid property like `"Address.City"`? — D Stanley, Jan 08 '15 at 14:45
@DStanley Most likely it is, as GetProperty only takes that as first parameter. — Xiaoy312, Jan 08 '15 at 14:52
@Xiaoy312 I know how `GetProerty` works; I was more interested in how the OP wants to pass in the sub-property. — D Stanley, Jan 08 '15 at 14:53

Xiaoy312 · Accepted Answer · 2015-01-08T14:55:23.267

GetProperty takes the name of the property as parameter, but you can't use it to fletch its property's property directly. You would need to chain it.

Enumerable.Empty<object>()
    // looks from the naming its a private variable, 
    //so you might want to call it via , GetProperty("subitem", BindingFlags.NonPublic) 
    .OrderBy(x => 
    {
        var subitem = x.GetType().GetProperty("subitem").GetValue(x);
        return subitem.GetType().GetProperty("value").GetValue(subitem);
    })
    .ToList();

If you have the type of the pList, I would suggest you to use a property selector aka Func<TObject, TPropertyToOrderBy> and give it to the OrderBy.

score 0 · Answer 2 · edited May 23 '17 at 12:20

0

You need to implement a custom IComparer and use the sort method.

The solution is here C# Sort and OrderBy comparison

edited May 23 '17 at 12:20

Community

1
1

answered Jan 08 '15 at 14:43

Frédéric THEVENON

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Order list elements by properties sub properties

2 Answers2