CODEWITHSUNDEEP
c#linq
Trey Balut
Trey Balut

Reputation: 1395

Array Elements Empty Except First

I want to check the elements in an array. If all elements except the first one are empty, then print out the array.

I am using the linq " Are all elements Empty function ". I'm not sure this is the correct syntax.

bool a = items.All(element => element == "");

Here is my code, it is not catching the Line 4 which is a a target line to identify of the commented lines. 

    private void CheckForQualifyArray(string line)
    {
        // "COMBINED ACCUMULATED TOTALS","","","","","","FINAL RESULTS",
        // "Primary Election","","","","","61 Of 61 Vote Centers Reporting","",
        // "March 3, 2020","","","","","","Collin County",
        // "1","","","","","","",
        // "STATISTICS","","","","","","",
        // "","TOTAL","Election Day","Early Voting","Mail","","",

        string[] input = line.Split(',');
        int arraySize = input.Length - 1;
        string[] items = new string[arraySize];

        items[0] = input[1].ToString();
        items[1] = input[2].ToString();
        items[2] = input[3].ToString();
        items[3] = input[4].ToString();
        items[4] = input[5].ToString();
        items[5] = input[6].ToString();
        items[6] = input[7].ToString();


        // Are all elements Empty
        bool a = items.All(element => element == "");

        if (a)
        {
            Debug.WriteLine(line);

        }

    }

Upvotes: 1

Views: 435

Answers (2)

Pavel Anikhouski
Pavel Anikhouski

Reputation: 23228

You don't need to create a new array, just use Skip method to omit the first element from array of line items and then use All. ToString() call is also redundant in your code, because input is already an array of strings

You can also use IsNullOrEmpty method to check that string is empty instead of comparison with empty string

string[] input = line.Split(',');

// Are all elements Empty
bool a = input.Skip(1).All(element => string.IsNullOrEmpty(element));

If quotes itself represent a part of string (it seems so), then All method predicate should care about the quotes (not the empty string)

bool a = input.Skip(1).All(element => element == @"""");

Upvotes: 3

Anu Viswan
Anu Viswan

Reputation: 18155

You could use Linq as the following

var input = line.Split(',').ToList();
if(input.Skip(1).All(x=>x.Equals("\"\""))) // Condition based on note below
{
     Debug.WriteLine(line);
}

Enumerable.Skip allows you to skip/bypass the required number of elements, and returns the remaining elements. You could then use Enumerable.All for checking the required condition.

Note Based on Samples in OP

Based on the samples lines given in the question, it is unclear whether you want to check if the string is Empty or "" (Quotes are part of string).

In case you want to check for String.Empty you could modify your condition above as

if(input.Skip(1).All(x=>string.IsNullOrEmpty(x)))
{
     Debug.WriteLine(line);
}

Upvotes: 2

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