求个回答

Question

用C#控制台应用程序   写一个字符串查找替换，
输入字符串：
输入替换的字符串：
替换后的字符串：要完整的。。

Answer 1

            String source;
            String oldstr;
            String newstr;
            Console.Write("输入字符串：");
            source = Console.ReadLine();            Console.Write("输入替换的字符串：");
            oldstr = Console.ReadLine();            Console.Write("替换后的字符串：");
            newstr = Console.ReadLine();            String output = source.Replace(oldstr,newstr);            Console.WriteLine(output);

Answer 2

            Console.WriteLine("输入字符");
            string str = Console.ReadLine();
            Console.WriteLine("输入要替换的字符");
            string A = Console.ReadLine(); 
            Console.WriteLine("输入要替换的字符");
            string B = Console.ReadLine();
            if (!str.Contains(A))
            {
                Console.WriteLine("为查找到该字符");
            }
            Console.WriteLine(str.Replace(A, B));
            Console.ReadLine();