Displaying 5 strings from an array

Question

I want to display strings in a file that begins with the letter "F" (var target = "F";) and then print it in footlockerExistingBlogTextBox however only display 5 strings/lines. The file that holds the array contains more that 5 strings that begin with "F" and so I only want to display the last 5 latest entries. Thanks for your help in advance. Much appreciated.

Below displays my code:

var target = "F";
var results = footlockerArray.Where(r => r.StartsWith(target)).Reverse();

foreach (string result in results)
{
    footlockerExistingBlogTextBox.Text += result;
}

for (int i = footlockerArray.Length - 1; i > footlockerArray.Length - 5; i--)
{
    footlockerArray.Reverse();
    footlockerExistingBlogTextBox.Text += footlockerArray[i];
}

Habib · Accepted Answer · 2014-06-04 13:31:54Z

2

Use Enumerable.Take and you can get the results like:

var results = footlockerArray.Where(r => r.StartsWith(target))
                             .OrderByDescending(r=> r)
                             .Take(5);

Then to get a string separated by a new line you can use string.Join like:

footlockerExistingBlogTextBox.Text = string.Join(Environment.NewLine, results);

answered Jun 4, 2014 at 13:31

Habib

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3 Comments

Paul Over a year ago

You should order by descending before you take 5. Otherwise you are taking the top 5 and reversing them.

Paul Over a year ago

Additionally, you're still ordered wrong. They should be reversed again later on. Now you're taking the last 5 but they are still in reverse order. I'm not sure ordering them is correct because the OP never said they were in order - just that the last 5 are requested.

Habib Over a year ago

@Paul, yes now I see the OP has tried Reverse twice, If op needs an ascending order then another OrderBy(r=> r) could be add in the end of statement. I will leave that for OP.

Paul · Accepted Answer · 2014-06-04 13:33:30Z

1

Reverse and use Take(5):

     footlockerArray
        .Where(o => o.StartsWith("F"))
        .Reverse()
        .Take(5)
        .Reverse()
        .ToList()
        .ForEach(o => footlockerExistingBlogTextBox.Text += o);

answered Jun 4, 2014 at 13:33

Paul

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