CODEWITHSUNDEEP
c#linq
Ben
Ben

Reputation: 2725

Case insensitive .contains for delegates?

If I have an array and I'm using LINQ to check the array elements contain a string using .All() is there a way to do this being case insensitive?

My code is:

string s1 = "hello my name is blah";
string[] split2 = fund.Split(' ');
if (split2.All((s1.Contains)))
    {
        //Do something
    }

If I was doing a simple .Contains(string) I could use the solution from this question. I think the answer will be roughly the same but I'm unsure how to implement the original solution when using delegates.

Upvotes: 0

Views: 164

Answers (5)

Peter Krassoi
Peter Krassoi

Reputation: 567

Spender was right but far short:

split2.All(str => s1.ToUpper().Contains(str.ToUpper()))

is what you need.

Upvotes: -1

Tim Schmelter
Tim Schmelter

Reputation: 460238

You can use the overload of String.IndexOf which accepts a StringComparison:

bool containsAll = split2
    .All(s2 => s1.IndexOf(s2, StringComparison.CurrentCultureIgnoreCase)>= 0);

Upvotes: 0

spender
spender

Reputation: 120508

split2.All(s1.Contains)

is effectively a shorthand for

split2.All(str => s1.Contains(str))

knowing this, it should now be easy for you to apply the extra parameter that you need.

Upvotes: 4

Novakov
Novakov

Reputation: 3095

You can create delegate which wraps Contains

Func<string, bool> insensitiveContains = s => s1.Contains(s, StringComparer.CurrentCultureIgnoreCase);

That you can use insensitiveContains as argument to All():

if (split2.All(insensitiveContains))

Upvotes: 0

Luaan
Luaan

Reputation: 63772

You can simply use a lambda expression instead:

if (
     split2.All
     (str => s1.IndexOf(str, StringComparison.CurrentCultureIgnoreCase) != -1)
   )

Upvotes: 2

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