How can I use string.Join() to join multiple substrings?

Question

I'm looping through some records, and flagging errors if there are difference using .Except Everything works great, except I want to make a more user friendly error message.

For failedTests, I only want to add the first characters of each line in errorRecords (There may be several lines.) If I do failedTests = string.Join("\n", errorRecords).Substring(0,10); I only get the substring for the first row. I need the substring for each row.

Is there a quick and dirty way to do this?

  var errorRecords = sourceList.Except(destList);
  failedTests = string.Join("\n", errorRecords);

StriplingWarrior · Accepted Answer · 2016-06-28 21:23:08Z

1

I recommend using a simple LINQ statement to create a modified version of each row, then passing that into the Join.

failedTests = string.Join("\n", errorRecords.Select(r => r.Substring(1, 10));

edited Jun 28, 2016 at 21:23

answered Jun 28, 2016 at 21:22

StriplingWarrior

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4 Comments

StriplingWarrior Over a year ago

@AlexD: Yeah, I was basing it on the OP. Not sure if he had that part intentionally.

AlexD Over a year ago

"the first ten characters", so perhaps not intentional.

Richard Over a year ago

Thanks, guys. I'm still playing around with the exact length. But I'll make sure to start it at 0. Cheers!

user4843530 Over a year ago

and you don't need to materialize errorRecords if you do failedTests = string.Join("\n", sourceList.Except(destList).Select(r => r.Substring(0, 10));

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