在 C# 中读取后消除换行符

Question

using A = System.Console;
public void point()
{
int hour, minute;
A.Write("Enter Time (HH:MM) = ");
hour = A.Read();
A.Write(":");
minute = A.Read();
}

我希望它像

"输入时间 (HH：MM( = 12(小时输入(：49(分钟输入(">

但它来了

"输入时间 (HH：MM( = 12(小时输入(：49(分钟输入(

Answer 1

最简单的方法(假设您正在从控制台读取，并且用户将输入小时然后按Enter，然后输入分钟并按Enter(：

static void Main(string[] args)
{
int hour = 0, minute = 0;
const int MAX_NUMBER_OF_DIGITS = 2 ;
Console.Write("Enter Time (HH:MM) = ");

// store cursor position
int cursorLeft = Console.CursorLeft;
int cursorTop = Console.CursorTop;

// use ReadLine, else you will only get 1 character 
// i.e. number more than 1 digits will not work
hour = int.Parse(Console.ReadLine());
Console.SetCursorPosition(cursorLeft + MAX_NUMBER_OF_DIGITS , cursorTop);
Console.Write(":");
minute = int.Parse(Console.ReadLine());
// Nitpickers! purposefully not using String.Format, 
// or $, since want to keep it simple!
Console.Write("You entered: " + hour + ":" + minute);
}

输出：

输入时间 (HH：MM( = 17：55

您输入： 17：55

虽然我宁愿推荐你这样更好、更不容易出错的方式(用户输入 HH：MM 并按一次Enter，即输入一个字符串，包括:即冒号(：

static void Main(string[] args)
{
int hour = 0, minute = 0;
Console.Write("Enter Time in format HH:MM = ");
string enteredNumber = Console.ReadLine();
string[] aryNumbers = enteredNumber.Split(':');
if (aryNumbers.Length != 2)
{
Console.Write("Invalid time entered!");
}
else
{
hour = int.Parse(aryNumbers[0]);
minute = int.Parse(aryNumbers[1]);
// Nitpickers! purposefully not using String.Format, 
// or $, since want to keep it simple!
Console.Write("You entered: " + hour + ":" + minute);
}
}

Answer 2

假设 A 是控制台，您可以这样做：

static void Main()
{
int hour, minute;
char[] hourChars = new char[2];
Console.Write("Enter Time (HH:MM) = ");
hourChars[0] = Console.ReadKey().KeyChar;
hourChars[1] = Console.ReadKey().KeyChar;
var hourString = new String(hourChars);
hour = int.Parse(hourString);
Console.Write(":");
minute = Console.Read();
}

Answer 3

假设 A 是标准的 c#Console那么您可以使用ReadKey而不是Read

ReadKey一次只会读取一个字符，但它不会强迫您按回车键，这是新行的原因。

static void Main()
{
char h1, h2, m1, m2;
Console.Write("Enter Time (HH:MM) = ");
h1 = Console.ReadKey().KeyChar;
h2 = Console.ReadKey().KeyChar;
Console.Write(":");
m1 = Console.ReadKey().KeyChar;
m2 = Console.ReadKey().KeyChar;
}

我将实际值解析作为练习。