Contains not working properly

Question

1.00/5 (1 vote)

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i had get the one column values from database that value contains another string or not

code

C#

String.Contains(business.Cuisine,"chicken",StringComparison.OrdinalIgnoreCase)

contains method not shown intelisense report thats why i have implement contains method
This method not working propely.For suppose if the source is null. how to handle and ignore the case.

C#

public static bool Contains(this string source, string toCheck, StringComparison comp)
      {
          if (source == null)
              return false;
          return source.IndexOf(toCheck, comp) >= 0;
      }

Please help me.
Thank u.

What I have tried:

C#

public static bool Contains(this string source, string toCheck, StringComparison comp)
      {
          if (source == null)
              return false;
          return source.IndexOf(toCheck, comp) >= 0;
      }

Posted 25-Dec-18 18:22pm

Krishna Veni

Updated 25-Dec-18 20:00pm

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OriginalGriff · Answer 1 · 2018-12-25T19:59:00

Quote:
contains method not shown intelisense

That's because Contains is not a static method: it's an instance method so you call it on the actual string:

C#

if (business.Cuisine.Contains("chicken"))
   {
   ...

And there is no Contains method that allows you to specify case insensitivity.
But the IndexOf method deos, as you have found on the internet.

But as I explained to you when you were trying it with Regexes:
How to handle null values in regx.ismatch[^]
You need to check and handle nulls yourself! The system will not do that for you - that is by design, and is absolutely correct...

Please, after 104 questions, you should be pretty competent in this stuff now, not making exactly the same mistake over and over again ... which make you look like you are learning absolutely nothing here, and that would just make you a Help Vampire.

LEOH88 · Answer 2 · 2018-12-25T20:00:00

Solution 2

String.IndexOf Method (System) | Microsoft Docs[^]

public static bool Contains(this string source, string toCheck, StringComparison comp)
      {
          if (source == null)
              return false;

          return source.IndexOf(toCheck, 0, source.Length, comp) >= 0;
      }

Posted 25-Dec-18 20:00pm

LEOH88

Comments

OriginalGriff 26-Dec-18 2:17am

Reason for my vote of one: This is the code he has already found, and that is in his question...