C#字符串

文章目录

• • • 字符串string

字符串string

String类的属性

namespace MyString
{
    class Program
    {
        static void Main(string[] args)
        {
            string str1, str2;
            str1 = "hello";
            str2 = "world";

            string str3 = str1 + str2;

            Console.WriteLine("legth:{0}", str1.Length);
        }
    }
}

String类的常用方法

namespace MyString
{
    class Program
    {
        static void Main(string[] args)
        {
            string str1 = "hello";
            string str2 = "world";

            string str3 = "hello";
            Console.WriteLine("result is : {0}", String.Compare(str1, str3));

            string str4 = "HELLO";
            Console.WriteLine("Compare result: {0}", String.Compare(str1, str4, true));
            Console.WriteLine("COmpare result: {0}", String.Compare(str1, str4, false));

            Console.WriteLine("Concat result:{0}", String.Concat(str1, str2));
            string str5 = String.Concat(str1, " ", str2);
            Console.WriteLine("Concat result:{0}", str5);
            Console.WriteLine("Concat result:{0}", String.Concat(str1, " ", str2, "!!!"));

            Console.WriteLine("str5 have str1 is {0}", str5.Contains(str1));

            Console.WriteLine("IndexOf: {0}", str1.IndexOf('o'));
            Console.WriteLine("str2 in str5 of IndexOf: {0}", str5.IndexOf(str2));

            Console.WriteLine("IndexOf: {0}", str5.IndexOf('o'));
            Console.WriteLine("IndexOf: {0}", str5.IndexOf('o', 5));

            char[] arr1 = new char[3] { 'l', 'o', 'w' };
            Console.WriteLine("IndexOfAny: {0}", str5.IndexOfAny(arr1));
            Console.WriteLine("IndexOfAny: {0}", str5.IndexOfAny(arr1, 5));

            str1 = str1.Insert(2, str4);
            Console.WriteLine("str1:{0}", str1);

            Console.WriteLine("str1 isNullOrEmpty:{0}", String.IsNullOrEmpty(str1));

            Console.WriteLine("LastIndexOf: {0}", str5.LastIndexOf('o'));
            Console.WriteLine("str2 in str5 of LastIndexOf: {0}", str5.LastIndexOf(str2));

            Console.WriteLine("Rrmove: {0}", str3.Remove(2));
            Console.WriteLine("Rrmove: {0}", str3.Remove(2, 2));

            Console.WriteLine("Replace: {0}", str3.Replace('l', 'w'));
            Console.WriteLine("Replace: {0}", str5.Replace("world", "WORLD"));

            char[] arr2 = str3.ToCharArray();
            foreach (char i in arr2)
            {
                Console.Write("{0} ", i);
            }
            Console.WriteLine(" ");

            char[] arr3 = str3.ToCharArray(2, 3);
            foreach (char i in arr3)
            {
                Console.Write("{0} ", i);
            }
            Console.WriteLine(" ");

            Console.WriteLine("ToLower:{0}", str4.ToLower());
            Console.WriteLine("ToUpper:{0}", str3.ToUpper());

            string str6 = " h e l l o ";
            Console.WriteLine("Trim:{0}", str6.Trim());
            Console.WriteLine("Trim:{0}", str6);

        }
    }
}