如何使用string.Join（）联接多个子字符串？

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);

Answer 1

我建议使用简单的LINQ语句创建每行的修改版本，然后将其传递给Join。

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