从单个字符串C＃获取多个子字符串

Question

I'm using a string to represent name/value pairs in an image filename.

string pairs = image_attribs(color,purple;size,large).jpg;

I need to parse that string to get the name/value pairs from before and after the semicolon. I can split on the semicolon and subtract the length to the opening parenthesis, but I'd like the corresponding function to be scalable to multiple pairs.

I need to come up with a multiple substring function that can return those pairs. I will then make them a list of KeyValuePairs:

List<KeyValuePair<string, string>> attributes = new List<KeyValuePair<string, string>>();

The current parsing which gets only the first pair:

string attribs = imagepath.Substring(imagepath.IndexOf("(") +1, imagepath.IndexOf(";" - imagepath.IndexOf("(");

I already have the function to parse the comma-separated pairs to create and add new KeyValuePairs.

Answer 1

var repspl = mydata.Split(';').Select( x =>  new { Key = x.Split(',')[0], Value = x.Split(',')[1] });

Answer 2

You could do something fun, like:

string pairs = "image_attribs(color,purple;size,large).jpg";

var attributes =  Regex.Match(pairs, @"\((.*?)\)").Groups[1].Value.Split(';')
    .Select(pair => pair.Split(','))
    .Select(pair => new { Attribute = pair[0], Value = pair[1] });

Answer 3

You can use split function with an array like in this example :

using System;

public class SplitTest {
    public static void Main() {

        string words = "This is a list of words, with: a bit of punctuation" +
                       "\tand a tab character.";

        string [] split = words.Split(new Char [] {' ', ',', '.', ':', '\t' });

        foreach (string s in split) {

            if (s.Trim() != "")
                Console.WriteLine(s);
        }
    }
}
// The example displays the following output to the console:
//       This
//       is
//       a
//       list
//       of
//       words
//       with
//       a
//       bit
//       of
//       punctuation
//       and
//       a
//       tab
//       character

This is from : http://msdn.microsoft.com/fr-fr/library/b873y76a(v=vs.110).aspx

Answer 4

You can use a combination of a regex and a cool use of capture capabilities in the .net regex engine:

string pairs = "image_attribs(color,purple;size,large;attr,val).jpg";

//This would capture each key in a <attr> named group and each 
//value in a <val> named group
var groups = Regex.Match(
    pairs, 
    @"\((?:(?<attr>[^),]+?),(?<val>[^);]+?)(?:;|\)))*");

//Because each group's capture is stored in .net you can access them and zip them into one list.
var yourList = 
    Enumerable.Zip
    (
        groups.Groups["attr"].Captures.Cast<Capture>().Select(c => c.Value), 
        groups.Groups["val"].Captures.Cast<Capture>().Select(c => c.Value), 
        (attr, val) => new KeyValuePair<string, string>(attr, val)
    ).ToList();