C＃分割字符串

Question

I want to know how to split the string into different lengths or chunks. Eg I want the name to be split into 0 to 19 with 0 the starting position and 19 the ending position. Any ideas on how I could do this?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace employeefinal
{
    class Program
    {
        static void Main(string[] args)
        {
            employee i = new employee("Tom");
            Console.WriteLine(i.getString());
            Console.ReadLine();
        }

        public class employee
        {
            string employeename = "Name: John Smith, L, U, 012, 2, 7, 2, 4";

            public employee(string name)
            {
                this.employeename = name;
            }

            public string getString()
            {
                employeename.Substring(0, 19).Trim();
                return employeename;
            }
        }
    }
}

Answer 1

You probably want to do as below, since strings are immutable in C#. When you do like you had, the "effect" is lost because you are not assigning that result to anything.

return employeename.Substring(0, 19).Trim();

Also note you lose original string once you assign "Tom" to it, through the constructor.

PS. When you pass start position and length which go out of bounds of the string instance you will get an exception.

Answer 2

As i understand, you want to split on comma separator, you have two options:

Option 01:

  public string getString()
  {
      return employeename.Substring(0, employeename.IndexOf(',').Trim();
  }

Option 02:

    public string getString()
    {
        return employeename.Split(',').FirstOrDefault();
    }

Happy to Help you!

Answer 3

following to what Giorgi said, change the implementation:

      public string getString()
        {
            if (employeename.Length > 19)
            {
                 return employeename.Substring(0, 19).Trim();
            }
            else
            {
                  //return error OR
                  return employeename;
            }

        }

also, your string is too short when assigning "tom" to it, you must make sure that you have atleast 19 characters.. i don't have VS in front of me, but basiclly the above implementation is better