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Use Linq to entities to filter on alpha and numeric values

Posted on 2012-03-20
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Last Modified: 2012-03-20
I have the following code in my method

            MyListViewModel viewModel = new MyListViewModel {
                MyList= repository.MyList
                .Where(m=> alphaFilter == (string)null || m.Title.StartsWith(alphaFilter))

this filters the list based on the first character in the string.  It works perfectly if the value passed as alphaFilter matches the first character of a the m.title.

My problem is that i want an alpha character to filter on the same character, but i want to be able to pass a "#" character and retrieve all entries that start with a numeric value.

in other words, i want my select list of alphaFilter characters to look like this...

# A B C D
not
1 2 3 4 5 6 7 8 9 0 A B C D

I know there is probably an easy solution, but i'm having trouble finding it.  Any help would be much appreciated
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Question by:kmitch62
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2 Comments
 
LVL 58

Accepted Solution

by:
amit_g earned 500 total points
ID: 37743680
What is alphaFilter and how you are populating it. It seems to be string. If so, the posted code won't work if it has more than one characters i.e. alphaFilter = "A" would work but alphaFilter = "AB" won't. Have you tested it for that?

For the digits, you could always do

alphaFilter = alphaFilter.Replace("#", "1234567890");

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and then it would work if the rest of the code works.

string alphaFilter = "AB#";
alphaFilter = alphaFilter.Replace("#", "1234567890");

.Where(m=> alphaFilter == null || alphaFilter.Contains(m.Title.Substring(0, 1)))

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0
 

Author Closing Comment

by:kmitch62
ID: 37743783
it was being populated by  .Select(x=>x.Title.Substring(0,1)  so there would only be one character. '#' is being added to the list at list[0].  that is the correct behavior.

as for the answer... that's exactly what i needed and I don't believe that i didn't see it myself.  Like i said, a simple answer that i was just missing.  Thanks for the help.
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