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sort data like Windows Explorer sorts files??

Posted on 2004-09-14
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Last Modified: 2010-04-15
have a Windows datagrid whose column values are
(1,10,100,1000,101,10-1,103,11,1710,2).  When the column's sorted (the
column's of type String), it'll sort this way
[1,10,100,1000,101,10-1,103,11,1710,2], which is wrong.  But in Windows
Explorer, when there are files with these same names , Explorer will sort
them like this: [1,2,10,10-1,11,100,101,103,1000,1710], which is correct.

How can I emulate this Windows explorer sort in my column?

Thanks.
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Question by:MyersA
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AvonWyss earned 38 total points
ID: 12059180
Pad the strings with leading 0s.

string sortKey=columnValue.PadLeft(20, '0');
And then compare the sortkeys of the items you want to sort.
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by:MyersA
ID: 12059487
Thanks.
Why does it sort correctly when I add the leading 0's?
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Expert Comment

by:AvonWyss
ID: 12059505
because...
  1 will be 00001 (if padded to 5 digits)
  2 will be 00002
10 will be 00010
etc.
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Author Comment

by:MyersA
ID: 12060171
And what about something like "1-100" or "10A"? How will it treat those?
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Assisted Solution

by:hunor_nam
hunor_nam earned 37 total points
ID: 12062675
You could write youre own compare method to the grid...
Compare(object arg1, object arg2) from the IComparer interface.

It's easy to get something like this:
1,2,10,11,100,101,103,1000,1710,10-1,10-D

You would first check if the two items are numbers (isNum) if so, compare them normally, if bouth items are string, compare them as strings
IF one of the items is number and the other is string then the number is "smaller".
This way you could get a sort as described above... numbers in natural order, and then Strings in "natural" order.

If you don't understand something, just ask.

(Sorry i curently do not work in C#, this is the reason I don't give code, as i don't want to make syntax errors)
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Author Comment

by:MyersA
ID: 12183167
I was assuming that Windows Explorer had a certain sorting mechanism that could be used. Isn't there an easier way to sort these without having to parse the string?
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Expert Comment

by:AvonWyss
ID: 12183673
My solution for instance? The very first one?
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Expert Comment

by:AvonWyss
ID: 12393799
TheLearnedOne, what is your recommendation?
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Expert Comment

by:hunor_nam
ID: 12398408
Good question :)
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