Compare value to array of strings using StartsWith

Question

I have an array:

string[] exceptions = new string[] { "one", two", "one_1", "three" };

.. I want to be able to say:

var result = from c in myCollection
             where not c.Property[3].Value.StartWith(exceptions)
             select c;

So I want myCollection to be filtered to only show those records whose Property[3].Value does not StartWith a value in the exceptions array. I know StartsWith doesn't take a collection so I'm unsure if this is possible via LINQ or not.

Is this possible in LINQ?! Or am I trying to shoehorn my problem into a LINQ solution?

EDIT: I should say, Contains is not an option since I only want to exclude elements whose property startswith the exception string.

sll · Accepted Answer · 2011-11-23 11:39:01Z

18

var result =  myCollection.Where(c =>  
                           exceptions.All(e => 
                                       !c.Property[3].Value.StartsWith(e));

edited Nov 23, 2011 at 11:39

answered Nov 23, 2011 at 10:57

sll

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9 Comments

pierre Over a year ago

This one worked for me first time and was a one-liner. Thank you.

sll Over a year ago

The query returns collections with property does not start with ANY exception string, !Any() return true even a property does not start single exception but we need to ensure this for all exceptions, I believe there is some confusion with word ANY

sll Over a year ago

@pierre : nice to hear, I would suggest covering such logic by unit tests looking forward

Enigmativity Over a year ago

With All it won't ever return any results. It should be Any.

sll Over a year ago

looks like there is some confusion, we have to ask OP what is work for him

|

Enigmativity · Accepted Answer · 2011-11-23 10:59:37Z

3

Try this:

string[] exceptions = new string[] { "one", "two", "one_1", "three" };

var result = from c in myCollection
            where !exceptions.Any(exception =>
                c.Property[3].Value.StartsWith(exception))
            select c;

answered Nov 23, 2011 at 10:59

Enigmativity

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Comments

Paul · Accepted Answer · 2011-11-23 11:01:19Z

3

You could use IndexOfAny (and check result is index position zero) as that takes a collection.

answered Nov 23, 2011 at 11:01

Paul

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Comments

Krypto_47 · Accepted Answer · 2011-11-23 10:59:01Z

0

You can select the collection of item you don't want then do a IEnumerable.Except().

I should look like this :

var result = from c in myCollection               
             where not c.Property[3].Value.StartWith(exceptions)               
             select c;  

var finalResult = myCollection.Except(myCollection.Select(i => i.StartWith(exception)));

answered Nov 23, 2011 at 10:59

Krypto_47

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Comments

hungryMind · Accepted Answer · 2011-11-23 10:59:35Z

0

var result = myCollection
              .where(
                 rs=>exceptions
                 .where(
                     rs1=>!rs.property[3].value.startsWith(rs1)
                  )
              )

answered Nov 23, 2011 at 10:59

hungryMind

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