C# Substring 和 String.join 0010

String Contains String:

using System;

namespace StringApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string str = "This is test";
            if (str.Contains("test"))
            {
                Console.WriteLine("The sequence 'test' is found");
            }
            Console.ReadKey();
        }
    }
}
           

output:

The sequence ‘test’ is found

using System;

namespace StringApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string str = "Last night I dreamt of shiqi Li";
            Console.WriteLine(str);
            string substr = str.Substring();
            Console.WriteLine(substr);
            Console.ReadKey();
        }
    }
}
           

output:

Last night I dreamt of shiqi Li

shiqi Li

using System;

namespace StringApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] strarry = new string[] {"I",
            "love",
           "you"};
            string str = String.Join("\n",strarry);
            Console.WriteLine(str);
            Console.ReadKey();
        }

    }
}