在C＃中基于两个定界符分割字符串

Question

Question - I am having a file(info.ref) that contains information in a specific format (refrence id |email addresses) eg:

ref1|a@a.com,b@b.com,c@c.com   
ref2|c@c.com,d@d.com

I also fetch refrence id from another file (say ref1).I need to iterate through this file and then want to send email to all email id`s assosiated with this refrence Id.

What I tried-

 using (var streamReader = new StreamReader("info.ref"))
                            {
                                string line1="";
                                while((line1 = streamReader.ReadLine()) != null)
                                {
                                    var parameters =
                                       from line11 in line1
                                       let split = line1.Split('|')
                                       select new { name = split.First(), value = split.Skip(1) };

                                   //email logic to be written


                                }

Problem -How to get email list from this "parameters".

Note -I understand that I can split the string with "|" as delimiters and again split with "," as delimiter and store in array.But can someone please guide what is wrong with the code I have written and how to retreive email addresses?and which is better way?.

Thanks in advance.

Answer 1

You haven't split the emails by comma yet and you don't need the LINQ query in the loop:

string[] tokens = line1.Split('|');
if(tokens.Length >= 2)
{
    string name = tokens[0];
    string[] emails = tokens[1].Split(',');
}

If you are learning LINQ, you could use File.ReadLines and following query:

var allInfos = from line in System.IO.File.ReadLines("info.ref")
               let tokens = line.Split('|')
               where tokens.Length >=  2
               select new { name = tokens[0], emails = tokens[1].Split(',') };

foreach(var info in allInfos)
    Console.WriteLine("Name:{0} Emails{1}", info.name, String.Join(",", info.emails));

Answer 2

You can also split by multiple separators (assuming that ref cannont contain , char)):

var emails = line1.Split('|', ',').Skip(1); //skipping ref

or:

var splitted = line1.Split('|', ',');
var paramerers = 
       new 
       {
           name = splitted.FirstOrDefault(), //for case of empty line
           value = spliited.Skip(1)
       };

//usage
var emails = parameters.value.ToArray(); // f.e.