去掉字符串多余空格

using System;
using System.Collections.Generic;
using System.Collections;
using System.Linq;
using System.Text;
using System.Xml;
using System.Text.RegularExpressions;
namespace ConsoleApplication1
{
    class Class1
    {       
        static void Main(string[] args)
        {         
            Class1 myclas = new Class1();
            string str = "a b   bc";//a至b之间空格有1个，b至bc之间空格有3个。       
            Console.WriteLine("{0}", myclas.F(str ));          
            Console.ReadLine();
        }
        public string F(string originStr)
        {
            string newStr = "";
            //以空格为标志分割字符串;经测试splits长度为5,元素为：a,b,"","",bc.第3、4个元素是不为空的元素。
            string[] splits = Regex.Split(originStr, " ", RegexOptions.IgnoreCase);
            int n = splits.Length;
            for (int i = 0; i < splits.Length; i++)
            {
                if (splits[i].Trim().Equals(""))  //这里不是空格，把元素为""的过滤掉.
                {
                    continue;
                }
                else
                {
                    newStr += splits[i] + " ";  //这里加一个空格
                }
            }
            return newStr;
        }              
    }
}