Perform Trim() while using Split()

问题

today I was wondering if there is a better solution perform the following code sample.

string keyword = " abc, foo  ,     bar";
string match = "foo";
string[] split= keyword.Split(new char[] { ',', ';' }, StringSplitOptions.RemoveEmptyEntries);
foreach(string s in split)
{
  if(s.Trim() == match){// asjdklasd; break;}
}

Is there a way to perform trim() without manually iterating through each item? I'm looking for something like 'split by the following chars and automatically trim each result'.

Ah, immediatly before posting I found

List<string> parts = line.Split(';').Select(p => p.Trim()).ToList();

in How can I split and trim a string into parts all on one line?

Still I'm curious: Might there be a better solution to this? (Or would the compiler probably convert them to the same code output as the Linq-Operation?)

回答1:

Another possible option (that avoids LINQ, for better or worse):

string line = " abc, foo  ,     bar";
string[] parts= Array.ConvertAll(line.Split(','), p => p.Trim());

However, if you just need to know if it is there - perhaps short-circuit?

bool contains = line.Split(',').Any(p => p.Trim() == match);

回答2:

var parts = line
    .Split(';')
    .Select(p => p.Trim())
    .Where(p => !string.IsNullOrWhiteSpace(p))
    .ToArray();

回答3:

If spaces just surrounds the words in the comma separated string this will work:

var keyword = " abc, foo  ,     bar";
var array = keyword.Replace(" ", "").Split(',');
if (array.Contains("foo"))
{
    Debug.Print("Match");
}

回答4:

I know this is 10 years too late but you could have just split by ' ' as well:

string[] split= keyword.Split(new char[] { ',', ';', ' ' }, StringSplitOptions.RemoveEmptyEntries);

Because you're also splitting by the space char AND instructing the split to remove the empty entries, you'll have what you need.

回答5:

I would suggest using regular expressions on the original string, looking for the pattern "any number of spaces followed by one of your delimiters followed by one or more spaces" and remove those spaces. Then split.

回答6:

Try this:

string keyword = " abc, foo  ,     bar";
string match = "foo";
string[] split = Regex.Split(keyword.Trim(), @"\s*[,;]\s*");
if (split.Contains(match))
{
    // do stuff
}

回答7:

You're going to find a lot of different methods of doing this and the performance change and accuracy isn't going to be readily apparent. I'd recommend plugging them all into a testing suite like NUnit in order both to find which one comes out on top AND which ones are accurate.

Use small, medium, and large amounts of text in loops to examine the various situations.

来源：https://stackoverflow.com/questions/1977340/perform-trim-while-using-split

标签

string

trim