C#语言————拼接、插入、替换、删除四种方法

            StringBuilder sb = new StringBuilder("hello");
            sb.Append("world");//拼接
            sb.Insert(5,",");//插入
            sb.Replace(",","-");//替换
            //sb.Remove(2,3);//删除
             Console.WriteLine(sb);               StringBuilder sb = new StringBu