c＃中的char数据类型 [英] char data type in c#

问题描述

在运行以下代码时没有错误，但它不接受第二次输入。

While am running the following code there is no error, but it doesnt accept second input.

Console.Write("Enter first char ");
          char a = Convert.ToChar(Console.Read());
          Console.Write("Enter second char ");
          char b = Convert.ToChar(Console.Read());// this input cannot be accepted
          Console.WriteLine("a-" + a.ToString() + ",b-" + b.ToString() + "");
          Console.ReadLine();

样本输出：



输入第一个字符c

输入第二个字符，b-

Sample Output:

Enter first char c
Enter second char a-c,b-

推荐答案

如果您只想读取一个字符不要使用 Read（），因为你会遇到更多问题，而不是对你有好处。 Console.ReadKey（）是您的理由：

If you ever want to read only a single character don't use Read() as you'll be getting more problems with it than it's good for you. Console.ReadKey() is the way to go in your case:

Console.Write("Enter first char: ");
char a = Console.ReadKey().KeyChar;
Console.Write("\nEnter second char: ");
char b = Console.ReadKey().KeyChar;
Console.WriteLine("\na-" + a.ToString() + ",b-" + b.ToString() + "");
Console.ReadLine();

虽然读取将从输入流中获取下一个字符，但它也会阻塞，直到输入新行。这个新行将保留在输入队列中，因此后续的 Read（）将获取该行。请参阅下文，了解MSDN对的说法。读取（）。



MSDN文档有这样的说法：

当您输入输入字符时，Read方法会阻止其返回;当您按下Enter键时，它会终止。按Enter键会将与平台相关的行终止序列添加到您的输入中（例如， Windows追加一个回车换行序列。对Read方法的后续调用一次检索输入一个字符。检索到最后一个字符后，Read再次阻止它返回并重复循环。

请注意，除非执行以下操作之一，否则不会获得属性值-1：同时按下Control修饰键和Z控制台键（Ctrl + Z），这表示文件结束条件;按下等效项表示文件结束条件的键，例如Windows中的F6功能键;或者将输入流重定向到具有实际文件结尾c的源（例如文本文件） haracter。





问候，

- Manfred

While read will fetch the next character from the input stream, it will also block until a new line is entered. This new line will remain in the input queue so your subsequent Read() will fetch that. See below for what MSDN has to say about Read().

The MSDN documentation has this to say:
"The Read method blocks its return while you type input characters; it terminates when you press the Enter key. Pressing Enter appends a platform-dependent line termination sequence to your input (for example, Windows appends a carriage return-linefeed sequence). Subsequent calls to the Read method retrieve your input one character at a time. After the final character is retrieved, Read blocks its return again and the cycle repeats.
Note that you will not get a property value of -1 unless you perform one of the following actions: simultaneously press the Control modifier key and Z console key (Ctrl+Z), which signals the end-of-file condition; press an equivalent key that signals the end-of-file condition, such as the F6 function key in Windows; or redirect the input stream to a source, such as a text file, that has an actual end-of-file character."


Regards,

— Manfred

Console.Write("Enter first char ");
           char a = Convert.ToChar(Console.Read());
           Console.ReadLine();
           Console.Write("Enter second char ");
           char b = Convert.ToChar(Console.Read());// this input cannot be accepted
           Console.WriteLine("a-" + a.ToString() + ",b-" + b.ToString() + "");
           Console.ReadKey(true);

在开始和逐行调试中放置一个断点，你可以看到输出。否则添加Console.Read（）以显示预期结果。

Hi,

Place a break point in the start and debug line by line you can see the output. otherwise add the Console.Read() to display the expected result.

Console.Write("Enter first char ");
char a = Convert.ToChar(Console.Read());
Console.Write("Enter second char ");
Console.Read(); // Add this line you can see the expected output
char b = Convert.ToChar(Console.Read());// this input cannot be accepted
Console.WriteLine("a-" + a.ToString() + ",b-" + b.ToString() + "");
Console.ReadLine();

谢谢

Sriram.B

Thanks
Sriram.B

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