在DOS下製作進度條

前言

在DOS下，爲了顯示一些進度信息，使用C#在.net core 3.1下編寫了一個類ControlProcessBar類，用於顯示進度信息。基本原理是通過 Console.CursorLeft 和 Console.CursorTop 進行定位，通過 Console.BackgroundColor 和 Console.ForegroundColor 進行顏色設置。

實際效果

調用方式

ControlProcessBar 的用法很簡單，只有一個 Percent 屬性，其值範圍爲 [0, 1]，具體用法如下所示。

static void Main(string[] args)
{
	Random rnd = new Random();
	ConsoleBar cb = new ConsoleBar();
	while (cb.Percent < 1)
	{
  		// 使用時只要修改 Percent 這個屬性即可自動更新。
		cb.Percent += rnd.NextDouble() * 0.01; 
		Thread.Sleep(10);
	}
}

源代碼

using System;

namespace ConsoleApp1
{
	class ConsoleProcessBar
	{
		public int Top { get; set; }
		public int Left { get; set; }

		public int Length { get; set; } = 80;

		double percent = 0;
		public double Percent
		{
			get => percent;
			set
			{
				if (percent == value)
					return;
				percent = value;
				Update();
			}
		}

		public ConsoleColor BackColor { get; set; } = ConsoleColor.Blue;
		public ConsoleColor ForeColor { get; set; } = ConsoleColor.White;

		void show(string s)
		{
			Console.Write(s);
		}

		public ConsoleBar()
		{
			Left = Console.CursorLeft;
			Top = Console.CursorTop;
			Console.SetCursorPosition(Left, Top);
			Console.WriteLine(new string('*', Length));
			for (int i = 0; i < Length; i++)
			{
				show(" ");
			}
			Console.WriteLine();
			Console.WriteLine(new string('*', Length));
		}

		public ConsoleBar(int left = 0, int top = 0)
		{
			Left = left;
			Top = top;
			Console.SetCursorPosition(Left, Top);
			Console.WriteLine(new string('*', Length));
			for (int i = 0; i < Length; i++)
			{
				show(" ");
			}
			Console.WriteLine();
			Console.WriteLine(new string('*', Length));
		}

		public void Update()
		{
			Percent = Percent > 1 ? 1 : Percent;
			Percent = Percent < 0 ? 0 : Percent;
			Console.SetCursorPosition(Left, Top + 1);
			ConsoleColor backColor = Console.BackgroundColor;
			ConsoleColor foreColor = Console.ForegroundColor;
			Console.BackgroundColor = BackColor;
			Console.ForegroundColor = ForeColor;
			int max = (int)(Percent * Length);
			for (int i = 0; i < max; i++)
			{
				show(" "); 
			}
			Console.BackgroundColor = backColor;
			Console.ForegroundColor = foreColor;

			int x = Console.CursorLeft;
			int y = Console.CursorTop;
			Console.SetCursorPosition(Left + 35, Top);
			Console.Write(" " + Percent.ToString("P") + " ");
			Console.SetCursorPosition(x, y);
			Console.WriteLine();
		}

	}
}