How to compare string with specific part of array item?

Question

I have an array arr[] of string type with array-items as follows:

arr[0]= "2/13/2019|202"
arr[1]= "2/14/2019|197"
arr[2]= "2/15/2019|101"
arr[4]= "2/16/2019|271"
arr[5]= "2/17/2019|199"

I want to get an array-item that matches my string "2/15/2019" so I can get "2/15/2019|101". in short, I just want to compare my string with the array-item string till "|" and rest strong will not be considered for comparison. how can I get it?

use contains() method

Atk
– Atk

2020-02-13 04:39:14 +00:00
Commented Feb 13, 2020 at 4:39 — Atk
– Atk, Commented Feb 13, 2020 at 4:39
var results = arr.Where(x => x.StartsWith("2/15/2019"));

TheGeneral
– TheGeneral

2020-02-13 04:42:34 +00:00
Commented Feb 13, 2020 at 4:42 — TheGeneral
– TheGeneral, Commented Feb 13, 2020 at 4:42

TheGeneral · Accepted Answer · 2020-02-13 04:47:41Z

3

You could use Where and StartWith

var results = arr.Where(x => x.StartsWith("2/15/2019"));

Additional Resources

Enumerable.Where Method

Filters a sequence of values based on a predicate.

String.StartsWith Method

Determines whether the beginning of this string instance matches a specified string.

answered Feb 13, 2020 at 4:47

TheGeneral

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Comments

Jawad · Accepted Answer · 2020-02-13 04:58:32Z

3

You can use Linq to get the data you are looking for.

use Contains(string) to check if there is one or more elements that match your criteria
if it does, get the first one from the list (or you can assign that list to a variable and iterate through each of it)
Split the value and get the value after |
Use ?. after FirstOrDefault() method to ensure you dont get NullReferenceException when you run Split().
Use validation to ensure result is not null.

var result = arr.FirstOrDefault(x => x.Contains("2/15/2019"))?.Split('|')[1];
// result contains 101

Enumerable.FirstOrDefault: Returns the first element of a sequence, or a default value if no element is found

edited Feb 13, 2020 at 4:58

answered Feb 13, 2020 at 4:42

Jawad

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2 Comments

devSS Over a year ago

just need to remove?

Jawad Over a year ago

@devSS If you use ?. before Split, you wont get Null Reference exceptions if there is no element in the array that contains that string. Try a search with string that doesnt match. ?. ensures there is always a value to run split on without exceptions.

Atk · Accepted Answer · 2020-02-13 04:46:39Z

1

Use where and contains

           string getdata = "2/15/2019";
            string[] arr = new string[5];
            arr[0] = "2/13/2019|202";
            arr[1] = "2/14/2019|197";
            arr[2] = "2/15/2019|101";
            arr[3] = "2/16/2019|271";
            arr[4] = "2/17/2019|199";

            var op = arr.Where(a => a.Contains(getdata)).FirstOrDefault();

answered Feb 13, 2020 at 4:46

Atk

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