Exspress's questions

我会给你一个昂贵的代码，给那些不想花 9 块钱下载一个特殊库的人。

static void Progressbar() {
            var blackBlock = "█";
            var middleBlock = "▓";
            var ligthBlock = "▒";
            int blockCount = 100;
            
            int start = 11;

            Console.ForegroundColor = ConsoleColor.Cyan;
            var posY = Console.CursorTop;
            //var LOADING = " Loading: [{0}{1}{2}]";
           // Console.Write(LOADING);

            Console.BackgroundColor = ConsoleColor.Blue;
            string TEMPLATE = " Loading: [{0}{1}{2}] ";
            Console.SetCursorPosition(start, posY);
            for (int i = 0; i < 50; i++) {
                /* Thread.Sleep(100);
                 TimeSpan.FromSeconds(100);
                 Console.Write("{0}", new string(' ', ligthBlock.Length));
                 Console.SetCursorPosition(Console.CursorLeft - 1, posY);
                 Console.Write("{0}", new string(' ', middleBlock.Length));
                 Thread.Sleep(100);
                 Console.BackgroundColor = ConsoleColor.DarkBlue;
                 Console.SetCursorPosition(Console.CursorLeft - 1, posY);
                 Console.Write("{0}", new string(' ', blackBlock.Length));
                 */

                Thread.Sleep(200);
                TimeSpan.FromSeconds(200);
                Console.BackgroundColor = ConsoleColor.Gray;
                var output = string.Format(" Loading: [{0}{1}{2}] ",
                    new string(' ', ligthBlock.Length),
                    new string(' ', middleBlock.Length),
                    new string(' ', blackBlock.Length));
                Console.Write(output);
            }

            Console.BackgroundColor = ConsoleColor.White;
            Console.Write("] \n");
  }

升级版：

       static void Progressbar() {
            int blockCount = 100;
            int start = 11;
            var posY = Console.CursorTop;

                //               //012345678911
                string template = " Loading: [{0}{1}{2} ] {3}% {4}s";
                Console.WriteLine(template);
                int maxProgress = 50;
                ConsoleProgressBar bar = new ConsoleProgressBar(11, posY, maxProgress);
                long previous = -1;
                long total = 1000000000;
                for (long i = 0; i < total; i++) {
                    long progress = i * maxProgress / total;
                    if (progress != previous) {
                        bar.ShowProgress((int)progress);
                        previous = progress;
                    }
                }

            bar.ShowProgress(maxProgress);
            Console.BackgroundColor = ConsoleColor.White;
        }

    }


    public class ConsoleProgressBar {
        public int Left { get; set; }
        public int Top { get; set; }
        public int Length { get; set; }

        public ConsoleProgressBar(int left, int top, int length) {
            Left = left;
            Top = top;
            Length = length;
        }

        public void ShowProgress(int progress) {
            if (progress > Length || progress < 0)
                throw new ArgumentException($"Invalid progress value, must be between 0 and {Length} but actual {progress}.");

            int start = 0;

            (int left, int top) = Console.GetCursorPosition();
            Console.SetCursorPosition(Left, Top);
            Thread.Sleep(100);
            Console.Write($"{new string('█', progress)}" +
                $"{new string('▓', progress)}" +
                $"{new string('░', Length - progress)}" +
                $"{new string(Convert.ToChar(start++), Length - progress)}" +
$"{new string(Convert.ToChar(Timer.ActiveCount), Length - progress)}");
            Console.SetCursorPosition(left, top);
            Thread.Sleep(100);
        }
}

这是我得到的结果：

为什么不显示]，完成百分比，完成时间？并且要注意进度条的一半█还没有结束。在加载过程中括号之间，如果需要，您还可以腾出空闲空间，即ShowProgress指定第二个参数将检查括号之间的空白是否必要并被填充。

我究竟做错了什么？

我不知道怎么做，请告诉我怎么做。我知道在 js 中有一个命令eval() 可以解决所有问题。在C++/CLI中怎么样？我不需要 Lua，只需要C++/CLI。

this->InputTextBox->Text

我想从 this->InputTextBox->Text 中取出一个字符串并将其转换为字符串类型：

String^ Matematic = gcnew String(InputTextBox->Text);

之后我需要把它变成int类型，怎么做？我不知道。然后解决一个数学表达式或示例并执行以下操作：

this->InputTextBox->Text = result;

PS（如果它像Js一样在C++ 中会很酷）。eval()