How do "CreateOrderedEnumerable " know the same sort of elements?

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how do "CreateOrdredEnumerable" know what the sort keys of "OrderBy", and "IOrderedEnumerable" only two methods, No record of the order of elements with the same.How do "CreateOrderedEnumerable" work? :

<pre lang="cs">string[] fruits = { "ee","cc","aa", "ddd", "bbb","aaa" };
IOrderedEnumerable<string> sortedFruits2 =
    fruits.OrderBy(fruit => fruit.Length);
foreach (string fruit in sortedFruits2)
    Console.WriteLine(fruit);
//output:

//ee
//cc
//aa
//ddd
//bbb
//aaa

//"ee,cc,aa" have the same level sort."ddd,bbb,aaa" have the same level sort.
//now "CreateOrderedEnumerable" sort "ee,cc,aa" and "ddd,bbb,aaa".
//How do "CreateOrderedEnumerable " know the same sort of elements?
IOrderedEnumerable<string> sortedFruits3 =
    sortedFruits2.CreateOrderedEnumerable<string>(
        fruit => fruit,
        Comparer<string>.Default, false);
Console.WriteLine();
foreach (string fruit in sortedFruits3)
    Console.WriteLine(fruit);

Posted 15-Jul-10 21:50pm

whoyousee

Updated 16-Jul-10 18:24pm

v5

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OriginalGriff 16-Jul-10 5:35am

Nope. Don't understand a word of that.

Try to explain in better detail what you are trying to achieve, and what your problem is. Bits of that look like a C# problem other bits like an SQL problem.

Edit your question, and include a code fragment (using "code block" to preserve the formatting) that illustrates what your problem is.

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Martin Jarvis · Accepted Answer · 2010-07-16T05:00:00

It looks like you're attempting to compare apples to oranges...

C#

IOrderedEnumerable<string> sortedFruits2 =
    fruits.OrderBy(fruit => fruit.Length);

Is ordering the array by string length, and I assume is using a normal string comparison (ie alphabetical) in a tie break.

C#

IOrderedEnumerable<string> sortedFruits3 =
    sortedFruits2.CreateOrderedEnumerable<string>(
        fruit => fruit,
        Comparer<string>.Default, false);

Your ordering the strings using the default comparison so you get an alphabetical ordering.