如何从列表中的字符串中删除\\ n \\ t <string> ？

Question

Inside a loop over the List i did:

private void listtostringlist(List<NewsLine> lnl, List<string> myl)
        {
            for (int i = 0; i < AllNews.Count; i++)
            {
                myl.Add(AllNews[i].text);
                IFormatProvider provider = CultureInfo.InvariantCulture;
                DateTime myTime = DateTime.ParseExact(AllNews[i].original_time, "DyyMMddTHHmm", provider);
                string results = myTime.ToString("hh:mm דווח במקור בתאריך : dd.MM.yy : שעה");
                AllNews[i].original_time = results;
                myl.Add(results);
                myl.Add(AllNews[i].link);
                myl[i] = Regex.Replace(myl[i], @"\t|\n|\r", "");
            }

Tried to use Regex:

myl[i] = Regex.Replace(myl[i], @"\t|\n|\r", "");

But no effect some lines still i see when using a breakpoint in the List have \\n\\t in the beginning or end. And i want to remove them if there are any.

Answer 1

I suspect that the count of AllNews is less than the count of lines in myl or that myl already has some lines in it when you pass it into this function.

If this is the case, then the counts won't match up and you wont get an iteration for each element in the collection, thus, not all elements will have the replace applied.

I'd rewrite it to this:

private void listtostringlist(List<NewsLine> lnl, List<string> myl)
{
    for (int i = 0; i < AllNews.Count; i++)
    {
          myl.Add(AllNews[i].text);
          // etc...
    }

    for(int i = 0; i < myl.Count; i++)
    {
        myl[i] = Regex.Replace(myl[i], @"\t|\n|\r", "");
    }
}

Also, as pointed out in the comments, you're also adding to myl multiple times in the for loop:

myl.Add(AllNews[i].text);
myl.Add(results);
myl.Add(AllNews[i].link);

This will mean that the counts of AllNews and myl will be out of sync so the indexer i is useless to myl given the context.