Console.ReadKey 方法

  • 参考

定义

命名空间:
System
程序集:
System.Console.dll
程序集:
netstandard.dll
程序集:
mscorlib.dll

获取用户按下的下一个字符或功能键。

重载

ReadKey()

获取用户按下的下一个字符或功能键。 按下的键显示在控制台窗口中。
ReadKey(Boolean)

获取用户按下的下一个字符或功能键。 按下的键可以选择显示在控制台窗口中。

ReadKey()

获取用户按下的下一个字符或功能键。 按下的键显示在控制台窗口中。

public:
 static ConsoleKeyInfo ReadKey();
[System.Runtime.Versioning.UnsupportedOSPlatform("browser")]
public static ConsoleKeyInfo ReadKey ();
[System.Runtime.Versioning.UnsupportedOSPlatform("browser")]
[System.Runtime.Versioning.UnsupportedOSPlatform("android")]
[System.Runtime.Versioning.UnsupportedOSPlatform("ios")]
[System.Runtime.Versioning.UnsupportedOSPlatform("tvos")]
public static ConsoleKeyInfo ReadKey ();
public static ConsoleKeyInfo ReadKey ();
[<System.Runtime.Versioning.UnsupportedOSPlatform("browser")>]
static member ReadKey : unit -> ConsoleKeyInfo
[<System.Runtime.Versioning.UnsupportedOSPlatform("browser")>]
[<System.Runtime.Versioning.UnsupportedOSPlatform("android")>]
[<System.Runtime.Versioning.UnsupportedOSPlatform("ios")>]
[<System.Runtime.Versioning.UnsupportedOSPlatform("tvos")>]
static member ReadKey : unit -> ConsoleKeyInfo
static member ReadKey : unit -> ConsoleKeyInfo
Public Shared Function ReadKey () As ConsoleKeyInfo

返回

ConsoleKeyInfo

一个对象，描述 ConsoleKey 常数和对应于按下的控制台键的 Unicode 字符（如果存在这样的字符）。 ConsoleKeyInfo 对象还在 ConsoleModifiers 值的按位组合中描述是否在按下控制台键的同时按下了一个或多个 Shift、Alt 和 Ctrl 修改键。

属性
UnsupportedOSPlatformAttribute

例外

InvalidOperationException

从控制台以外的某个流重定向 In 属性。

示例

方法的最常见用途之一 ReadKey() 是在用户按下某个键时暂停程序执行，然后应用终止或显示其他信息窗口。 下面的示例使用 ReadKey() 方法在终止应用之前等待用户按 enter 键。

using System;

public class Example
{
   public static void Main()
   {
      DateTime dat = DateTime.Now;
      Console.WriteLine("The time: {0:d} at {0:t}", dat);
      TimeZoneInfo tz = TimeZoneInfo.Local;
      Console.WriteLine("The time zone: {0}\n",
                        tz.IsDaylightSavingTime(dat) ?
                           tz.DaylightName : tz.StandardName);
      Console.Write("Press <Enter> to exit... ");
      while (Console.ReadKey().Key != ConsoleKey.Enter) {}
   }
}
// The example displays output like the following:
//     The time: 11/11/2015 at 4:02 PM:
//     The time zone: Pacific Standard Time

open System

let dat = DateTime.Now
printfn $"The time: {dat:d} at {dat:t}"

let tz = TimeZoneInfo.Local
printfn $"The time zone: {if tz.IsDaylightSavingTime dat then tz.DaylightName else tz.StandardName}\n"
printf"Press <Enter> to exit... "
while Console.ReadKey().Key <> ConsoleKey.Enter do ()


// The example displays output like the following:
//     The time: 12/28/2021 at 8:35 PM
//     The time zone: Pacific Standard Time

Module Example
   Public Sub Main()
      Dim dat As Date = Date.Now
      Console.WriteLine("The time: {0:d} at {0:t}", dat)
      Dim tz As TimeZoneInfo = TimeZoneInfo.Local
      Console.WriteLine("The time zone: {0}", 
                        If(tz.IsDaylightSavingTime(dat),
                           tz.DaylightName, tz.StandardName))
      Console.WriteLine()
      Console.Write("Press <Enter> to exit... ")
      Do While Console.ReadKey().Key <> ConsoleKey.Enter
      Loop
   End Sub
End Module
' The example displays the following output:
'     The time: 11/11/2015 at 4:02 PM
'     The time zone: Pacific Standard Time

请注意，默认情况下，此 ReadKey 方法重载会回显用户在控制台上按下的所有可显示键。 若要取消它们，请 ReadKey 使用参数调用方法 intercept true 。

下面的示例使用 ReadKey() 方法显示有关用户按下的键的信息。

using namespace System;

void main()
{
   ConsoleKeyInfo cki;
   // Prevent example from ending if CTL+C is pressed.
   Console::TreatControlCAsInput = true;

   Console::WriteLine("Press any combination of CTL, ALT, and SHIFT, and a console key.");
   Console::WriteLine("Press the Escape (Esc) key to quit: \n");
   do 
   {
      cki = Console::ReadKey();
      Console::Write(" --- You pressed ");
      if((cki.Modifiers & ConsoleModifiers::Alt) != ConsoleModifiers()) Console::Write("ALT+");
      if((cki.Modifiers & ConsoleModifiers::Shift) != ConsoleModifiers()) Console::Write("SHIFT+");
      if((cki.Modifiers & ConsoleModifiers::Control) != ConsoleModifiers()) Console::Write("CTL+");
      Console::WriteLine(cki.Key.ToString());
   } while (cki.Key != ConsoleKey::Escape);
}
// This example displays output similar to the following:
//       Press any combination of CTL, ALT, and SHIFT, and a console key.
//       Press the Escape (Esc) key to quit:
//       
//       a --- You pressed A 
//       k --- You pressed ALT+K 
//       ► --- You pressed CTL+P 
//         --- You pressed RightArrow 
//       R --- You pressed SHIFT+R 
//                --- You pressed CTL+I 
//       j --- You pressed ALT+J 
//       O --- You pressed SHIFT+O 
//       § --- You pressed CTL+U }

using System;

class Example
{
   public static void Main()
   {
      ConsoleKeyInfo cki;
      // Prevent example from ending if CTL+C is pressed.
      Console.TreatControlCAsInput = true;

      Console.WriteLine("Press any combination of CTL, ALT, and SHIFT, and a console key.");
      Console.WriteLine("Press the Escape (Esc) key to quit: \n");
      do
      {
         cki = Console.ReadKey();
         Console.Write(" --- You pressed ");
         if((cki.Modifiers & ConsoleModifiers.Alt) != 0) Console.Write("ALT+");
         if((cki.Modifiers & ConsoleModifiers.Shift) != 0) Console.Write("SHIFT+");
         if((cki.Modifiers & ConsoleModifiers.Control) != 0) Console.Write("CTL+");
         Console.WriteLine(cki.Key.ToString());
       } while (cki.Key != ConsoleKey.Escape);
    }
}
// This example displays output similar to the following:
//       Press any combination of CTL, ALT, and SHIFT, and a console key.
//       Press the Escape (Esc) key to quit:
//
//       a --- You pressed A
//       k --- You pressed ALT+K
//       ► --- You pressed CTL+P
//         --- You pressed RightArrow
//       R --- You pressed SHIFT+R
//                --- You pressed CTL+I
//       j --- You pressed ALT+J
//       O --- You pressed SHIFT+O
//       § --- You pressed CTL+U

open System

// Prevent example from ending if CTL+C is pressed.
Console.TreatControlCAsInput <- true

printfn "Press any combination of CTL, ALT, and SHIFT, and a console key."
printfn "Press the Escape (Esc) key to quit: \n"

let mutable cki = Unchecked.defaultof<ConsoleKeyInfo>

while cki.Key <> ConsoleKey.Escape do
    cki <- Console.ReadKey()
    printf " --- You pressed "
    if int (cki.Modifiers &&& ConsoleModifiers.Alt) <> 0 then printf "ALT+"
    if int (cki.Modifiers &&& ConsoleModifiers.Shift) <> 0 then printf "SHIFT+"
    if int (cki.Modifiers &&& ConsoleModifiers.Control) <> 0 then printf "CTL+"
    printfn $"{cki.Key}"


// This example displays output similar to the following:
//       Press any combination of CTL, ALT, and SHIFT, and a console key.
//       Press the Escape (Esc) key to quit:
//
//       a --- You pressed A
//       k --- You pressed ALT+K
//       ► --- You pressed CTL+P
//         --- You pressed RightArrow
//       R --- You pressed SHIFT+R
//                --- You pressed CTL+I
//       j --- You pressed ALT+J
//       O --- You pressed SHIFT+O
//       § --- You pressed CTL+U

Class Example
   Public Shared Sub Main()
      Dim cki As ConsoleKeyInfo
      ' Prevent example from ending if CTL+C is pressed.
      Console.TreatControlCAsInput = True

      Console.WriteLine("Press any combination of CTL, ALT, and SHIFT, and a console key.")
      Console.WriteLine("Press the Escape (Esc) key to quit: " + vbCrLf)
      Do
         cki = Console.ReadKey()
         Console.Write(" --- You pressed ")
         If (cki.Modifiers And ConsoleModifiers.Alt) <> 0 Then Console.Write("ALT+")
         If (cki.Modifiers And ConsoleModifiers.Shift) <> 0 Then Console.Write("SHIFT+")
         If (cki.Modifiers And ConsoleModifiers.Control) <> 0 Then Console.Write("CTL+")
         Console.WriteLine(cki.Key.ToString)
      Loop While cki.Key <> ConsoleKey.Escape
   End Sub 
End Class 
' This example displays output similar to the following:
'       Press any combination of CTL, ALT, and SHIFT, and a console key.
'       Press the Escape (Esc) key to quit:
'       
'       a --- You pressed A 
'       k --- You pressed ALT+K 
'       ► --- You pressed CTL+P 
'         --- You pressed RightArrow 
'       R --- You pressed SHIFT+R 
'                --- You pressed CTL+I 
'       j --- You pressed ALT+J 
'       O --- You pressed SHIFT+O 
'       § --- You pressed CTL+U

注解

ReadKey方法将等待，即在发出方法的线程上进行阻止 ReadKey ，直到按下某个字符或功能键。 可以将一个或多个 Alt、Ctrl 或 Shift 修改键与一个字符或功能键结合使用。 但是，按一个修改键本身将不会导致该 ReadKey 方法返回。

根据你的应用程序，你可能想要将 ReadKey 方法与属性结合使用 KeyAvailable 。

ReadKey即使使用方法将标准输入重定向到文件，该方法也会从键盘读取 SetIn 。

另请参阅

适用于

ReadKey(Boolean)

获取用户按下的下一个字符或功能键。 按下的键可以选择显示在控制台窗口中。

public:
 static ConsoleKeyInfo ReadKey(bool intercept);
[System.Runtime.Versioning.UnsupportedOSPlatform("browser")]
public static ConsoleKeyInfo ReadKey (bool intercept);
[System.Runtime.Versioning.UnsupportedOSPlatform("browser")]
[System.Runtime.Versioning.UnsupportedOSPlatform("android")]
[System.Runtime.Versioning.UnsupportedOSPlatform("ios")]
[System.Runtime.Versioning.UnsupportedOSPlatform("tvos")]
public static ConsoleKeyInfo ReadKey (bool intercept);
public static ConsoleKeyInfo ReadKey (bool intercept);
[<System.Runtime.Versioning.UnsupportedOSPlatform("browser")>]
static member ReadKey : bool -> ConsoleKeyInfo
[<System.Runtime.Versioning.UnsupportedOSPlatform("browser")>]
[<System.Runtime.Versioning.UnsupportedOSPlatform("android")>]
[<System.Runtime.Versioning.UnsupportedOSPlatform("ios")>]
[<System.Runtime.Versioning.UnsupportedOSPlatform("tvos")>]
static member ReadKey : bool -> ConsoleKeyInfo
static member ReadKey : bool -> ConsoleKeyInfo
Public Shared Function ReadKey (intercept As Boolean) As ConsoleKeyInfo

参数

intercept
Boolean

确定是否在控制台窗口中显示按下的键。 如果为 true，则不显示按下的键；否则为 false。

返回

ConsoleKeyInfo

一个对象，描述 ConsoleKey 常数和对应于按下的控制台键的 Unicode 字符（如果存在这样的字符）。 ConsoleKeyInfo 对象还在 ConsoleModifiers 值的按位组合中描述是否在按下控制台键的同时按下了一个或多个 Shift、Alt 和 Ctrl 修改键。

属性
UnsupportedOSPlatformAttribute

例外

InvalidOperationException

从控制台以外的某个流重定向 In 属性。

示例

方法的最常见用途之一 ReadKey 是在用户按下某个键时暂停程序执行，然后应用终止或显示其他信息窗口。 下面的示例使用 ReadKey(Boolean) 方法在终止应用之前等待用户按 enter 键。 请注意，如果用户按下任何其他键，则不会回显到控制台。

using System;

public class Example
{
   public static void Main()
   {
      DateTime dat = DateTime.Now;
      Console.WriteLine("The time: {0:d} at {0:t}", dat);
      TimeZoneInfo tz = TimeZoneInfo.Local;
      Console.WriteLine("The time zone: {0}\n",
                        tz.IsDaylightSavingTime(dat) ?
                           tz.DaylightName : tz.StandardName);
      Console.Write("Press <Enter> to exit... ");
      while (Console.ReadKey(true).Key != ConsoleKey.Enter) {}
   }
}
// The example displays output like the following:
//     The time: 11/11/2015 at 4:02 PM:
//     The time zone: Pacific Standard Time

open System

let dat = DateTime.Now
printfn $"The time: {dat:d} at {dat:t}"

let tz = TimeZoneInfo.Local
printfn $"The time zone: {if tz.IsDaylightSavingTime dat then tz.DaylightName else tz.StandardName}\n"
printf"Press <Enter> to exit... "
while Console.ReadKey(true).Key <> ConsoleKey.Enter do ()


// The example displays output like the following:
//     The time: 12/28/2021 at 8:37 PM
//     The time zone: Pacific Standard Time

Module Example
   Public Sub Main()
      Dim dat As Date = Date.Now
      Console.WriteLine("The time: {0:d} at {0:t}", dat)
      Dim tz As TimeZoneInfo = TimeZoneInfo.Local
      Console.WriteLine("The time zone: {0}", 
                        If(tz.IsDaylightSavingTime(dat),
                           tz.DaylightName, tz.StandardName))
      Console.WriteLine()
      Console.Write("Press <Enter> to exit... ")
      Do While Console.ReadKey(True).Key <> ConsoleKey.Enter
      Loop
   End Sub
End Module
' The example displays the following output:
'     The time: 11/11/2015 at 4:02 PM
'     The time zone: Pacific Standard Time

下面的示例使用 ReadKey(Boolean) 方法来显示用户按下的键的相关信息，而无需将该密钥回显到控制台。

using namespace System;

void main()
{
   ConsoleKeyInfo cki;
   // Prevent example from ending if CTL+C is pressed.
   Console::TreatControlCAsInput = true;

   Console::WriteLine("Press any combination of CTL, ALT, and SHIFT, and a console key.");
   Console::WriteLine("Press the Escape (Esc) key to quit: \n");
   do {
      cki = Console::ReadKey(true);
      Console::Write("You pressed ");
      if ((cki.Modifiers & ConsoleModifiers::Alt) != ConsoleModifiers()) Console::Write("ALT+");
      if ((cki.Modifiers & ConsoleModifiers::Shift) != ConsoleModifiers()) Console::Write("SHIFT+");
      if ((cki.Modifiers & ConsoleModifiers::Control) != ConsoleModifiers()) Console::Write("CTL+");
      Console::WriteLine("{0} (character '{1}')", cki.Key, cki.KeyChar);
   } while (cki.Key != ConsoleKey::Escape);
}
// This example displays output similar to the following:
//       Press any combination of CTL, ALT, and SHIFT, and a console key.
//       Press the Escape (Esc) key to quit:
//       
//       You pressed CTL+A (character '☺')
//       You pressed C (character 'c')
//       You pressed CTL+C (character '♥')
//       You pressed K (character 'k')
//       You pressed ALT+I (character 'i')
//       You pressed ALT+U (character 'u')
//       You pressed ALT+SHIFT+H (character 'H')
//       You pressed Escape (character '←')

using System;

class Example
{
   public static void Main()
   {
      ConsoleKeyInfo cki;
      // Prevent example from ending if CTL+C is pressed.
      Console.TreatControlCAsInput = true;

      Console.WriteLine("Press any combination of CTL, ALT, and SHIFT, and a console key.");
      Console.WriteLine("Press the Escape (Esc) key to quit: \n");
      do {
         cki = Console.ReadKey(true);
         Console.Write("You pressed ");
         if ((cki.Modifiers & ConsoleModifiers.Alt) != 0) Console.Write("ALT+");
         if ((cki.Modifiers & ConsoleModifiers.Shift) != 0) Console.Write("SHIFT+");
         if ((cki.Modifiers & ConsoleModifiers.Control) != 0) Console.Write("CTL+");
         Console.WriteLine("{0} (character '{1}')", cki.Key, cki.KeyChar);
      } while (cki.Key != ConsoleKey.Escape);
   }
}
// This example displays output similar to the following:
//       Press any combination of CTL, ALT, and SHIFT, and a console key.
//       Press the Escape (Esc) key to quit:
//
//       You pressed CTL+A (character '☺')
//       You pressed C (character 'c')
//       You pressed CTL+C (character '♥')
//       You pressed K (character 'k')
//       You pressed ALT+I (character 'i')
//       You pressed ALT+U (character 'u')
//       You pressed ALT+SHIFT+H (character 'H')
//       You pressed Escape (character '←')

open System

// Prevent example from ending if CTL+C is pressed.
Console.TreatControlCAsInput <- true

printfn "Press any combination of CTL, ALT, and SHIFT, and a console key."
printfn "Press the Escape (Esc) key to quit: \n"

let mutable cki = Unchecked.defaultof<ConsoleKeyInfo>

while cki.Key <> ConsoleKey.Escape do
    cki <- Console.ReadKey true
    printf "You pressed "
    if int (cki.Modifiers &&& ConsoleModifiers.Alt) <> 0 then printf "ALT+"
    if int (cki.Modifiers &&& ConsoleModifiers.Shift) <> 0 then printf "SHIFT+"
    if int (cki.Modifiers &&& ConsoleModifiers.Control) <> 0 then printf "CTL+"
    printfn $"{cki.Key} (character '{cki.KeyChar}')" 


// This example displays output similar to the following:
//       Press any combination of CTL, ALT, and SHIFT, and a console key.
//       Press the Escape (Esc) key to quit:
//
//       You pressed CTL+A (character '☺')
//       You pressed C (character 'c')
//       You pressed CTL+C (character '♥')
//       You pressed K (character 'k')
//       You pressed ALT+I (character 'i')
//       You pressed ALT+U (character 'u')
//       You pressed ALT+SHIFT+H (character 'H')
//       You pressed Escape (character '←')

Class Example
   Public Shared Sub Main()
      Dim cki As ConsoleKeyInfo
      ' Prevent example from ending if CTL+C is pressed.
      Console.TreatControlCAsInput = True

      Console.WriteLine("Press any combination of CTL, ALT, and SHIFT, and a console key.")
      Console.WriteLine("Press the Escape (Esc) key to quit: " + vbCrLf)
      Do
         cki = Console.ReadKey(True)
         Console.Write("You pressed ")
         If (cki.Modifiers And ConsoleModifiers.Alt) <> 0 Then Console.Write("ALT+")
         If (cki.Modifiers And ConsoleModifiers.Shift) <> 0 Then Console.Write("SHIFT+")
         If (cki.Modifiers And ConsoleModifiers.Control) <> 0 Then Console.Write("CTL+")
         Console.WriteLine("{0} (character '{1}')", cki.Key, cki.KeyChar)
      Loop While cki.Key <> ConsoleKey.Escape
   End Sub
End Class 
' This example displays output similar to the following:
'       Press any combination of CTL, ALT, and SHIFT, and a console key.
'       Press the Escape (Esc) key to quit:
'       
'       You pressed CTL+A (character '☺')
'       You pressed C (character 'c')
'       You pressed CTL+C (character '♥')
'       You pressed K (character 'k')
'       You pressed ALT+I (character 'i')
'       You pressed ALT+U (character 'u')
'       You pressed ALT+SHIFT+H (character 'H')
'       You pressed Escape (character '←')

注解

ReadKey方法将等待，即在发出方法的线程上进行阻止 ReadKey ，直到按下某个字符或功能键。 可以将一个或多个 Alt、Ctrl 或 Shift 修改键与一个字符或功能键结合使用。 但是，按一个修改键本身将不会导致该 ReadKey 方法返回。

如果 intercept 参数为 true ，则会截获按下的键; 否则，会显示按下的键。

根据你的应用程序，你可能想要将 ReadKey 方法与属性结合使用 KeyAvailable 。

ReadKey即使使用方法将标准输入重定向到文件，该方法也会从键盘读取 SetIn 。

另请参阅

适用于