Building an OrderBy Lambda expression based on child entity's property

Question

I\'m trying to generate a LINQ OrderBy clause using lambda expressions with an input of the column name of an entity as a string (in the \"sortOn\" variable bel

Answer 1

Hi you can also create an extension method like which can sort to any depth not only just child

        public static IEnumerable CustomOrderBy(this IEnumerable source, Func keySelector)
    {
        List list=new List();
        List returnList=new List();
        List indexList = new List();

        if (source == null)
            return null;
        if (source.Count() <= 0)
            return source;
        source.ToList().ForEach(sc=>list.Add(keySelector(sc).ToString())); //Extract the strings of property to be ordered

        list.Sort(); //sort the list of strings

        foreach (string l in list) // extract the list of indexes of source according to the order
        {
            int i=0;
            //list.ForEach(l =>

                foreach (var s in source.ToList())
                {
                    if (keySelector(s).ToString() == l)
                        break;
                    i++;
                }
                indexList.Add(i);
        }
        indexList.ForEach(i=>returnList.Add(source.ElementAt(i))); //rearrange the source according to the above extracted indexes
        return returnList;
    }
}
public class Name
{
    public string FName { get; set; }
    public string LName { get; set; }
}
public class Category
{
    public Name Name { get; set; }
}
public class SortChild
{
    public void SortOn()
    {
        List category = new List{new Category(){Name=new Name(){FName="sahil",LName="chauhan"}},
            new Category(){Name=new Name(){FName="pankaj",LName="chauhan"}},
            new Category(){Name=new Name(){FName="harish",LName="thakur"}},
            new Category(){Name=new Name(){FName="deepak",LName="bakseth"}},
            new Category(){Name=new Name(){FName="manish",LName="dhamaka"}},
            new Category(){Name=new Name(){FName="arev",LName="raghaka"}}
        };
        var a = category.CustomOrderBy(s => s.Name.FName);

    }

}

Its custom method and right now it works only for string property only however it can be reactified using generics to work for any primitive type. I hope this will help.