Sorting according to Capital Latters

Question

1.00/5 (2 votes)

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Hello Everyone,

I am trying to sort my grid control column which contains text. I have one issue. When i am sorting everything in ascending order it puts "AA" before "aa", it is putting the Capital letters first and then the small letters, how to reverse this? does everyone see the same problem or has anyone solved. it.

I want the ascending sort result to be of type ::

aa
bb
AA
Ab

Remember Do not use IComparer in Code.

Posted 25-Apr-12 19:14pm

sunandandutt

Updated 25-Apr-12 21:54pm

v3

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Comments

Pete O'Hanlon 26-Apr-12 4:15am

Why are you trying to avoid IComparer - it's the right tool to do the job. Would you use a melon to hammer in a nail? Of course you wouldn't, so why are you trying to avoid doing this.

Sergey Alexandrovich Kryukov 10-May-12 0:01am

Absolutely. This is a totally incorrect request, an abuse.

Now, what would you say about this request (asking you as the most suspicious member I know :-):
http://www.codeproject.com/Questions/381777/Tech-Gig-Problem-of-Expert-Level

What do you think? Could it be an attempt to cheat or something like that?
--SA

Pete O'Hanlon 10-May-12 3:58am

Oh it's definitely attempting to cheat.

3 solutions

Solution 1

The question is not tagged with the type of UI corresponding to the Grid control mentioned in the question.
However, I think a custom comparer can be used to sort the items as per requirement.
To illustrate the idea, I have taken an array with the above items and sorted it with a custom comparer as shown below

C#

void Main()
{
    string[] items = new [] {"AA","aa","Ab","bb"};
    Array.Sort(items, new ItemComparer());
}

public class ItemComparer : IComparer<string> {
    public int Compare(string x, string y){
        if (char.IsLower(x,0) && char.IsUpper(y,0) )
            return -1;
        else if (char.IsUpper(x,0) && char.IsLower(y,0))
            return 1;
        else
            return x.CompareTo(y);
    }
}
//Sorted array contents
//aa
//bb
//AA
//Ab

Hope, it may give some clue to implement similar functionality for the problem specified in the question.

Posted 25-Apr-12 20:11pm

VJ Reddy

Solution 3

This solution I posted as separate solution, as it is different from my earlier solution, and posting in the earlier make it very long and they may get mixed up.

C#

void Main()
{

    MyString[] items = new [] {new MyString("AA"), new MyString("aa"),
        new MyString("Ab"), new MyString("bb")};

    Array.Sort(items);
}
public struct MyString : IComparable<MyString> {
    public string Item;
    public MyString(string item){
        Item=item;
    }
    public override string ToString(){
        return Item;
    }
    public int CompareTo(MyString other){
        if (char.IsLower(Item,0) && char.IsUpper(other.Item,0) )
            return -1;
        else if (char.IsUpper(Item,0) && char.IsLower(other.Item,0))
            return 1;
        else
            return Item.CompareTo(other.Item);
    }
}
//Sorted array contents
//aa
//bb
//AA
//Ab

Posted 25-Apr-12 20:44pm

VJ Reddy

Updated 25-Apr-12 20:45pm

v2

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sunandandutt · Accepted Answer · 2012-05-17T23:51:00

C#

void Main()
{
    string[] items = new [] {"AA","aa","Ab","bb"};
    Array.Sort(items, new ItemComparer());
}

public class ItemComparer : IComparer<string> {
    public int Compare(string x, string y){
        if (char.IsLower(x,0) && char.IsUpper(y,0) )
            return -1;
        else if (char.IsUpper(x,0) && char.IsLower(y,0))
            return 1;
        else
            return x.CompareTo(y);
    }
}