字符串比较的常用函数

       static void Main(string[] arg)
        {
            int int1 = 0;
            int int2 = 0;
            int int3 = 0;
            string str1 = "adf";
            string str2 = "adf";
            string str3 = "Adf";
            string str4 = "Bdf";
            string str5 = "";
            //比较字符串的常用函数:
            //(1) ==
            //(2) Int Compare(string strA,string strB);
            //(3) Int Compare(string strA,string strB,bool IgorCase)//忽略大小写
            //(4) public Int CompareTo(string strB );
            //(5) public bool Equals(string value)
            //    public static bool Equals(string a, string b)


            //练习1
            Console.WriteLine(str1 == str2);

            //练习2
            Console.WriteLine(string.Compare("aaa", "aaa"));
            Console.WriteLine(string.Compare("aaa", "bbb"));
            Console.WriteLine(string.Compare("bbb", "aaa"));

            //练习3
            Console.WriteLine(string.Compare("aaa", "aAa", true));
            Console.WriteLine(string.Compare("aaa", "aAa", false));

            //练习4
            Console.WriteLine(str1.CompareTo(str2));

            //练习5
            Console.WriteLine(str1.Equals(str2));
            Console.WriteLine(string.Equals(str1, str2));

            Console.ReadKey();
        }