c# - 如何在 .Net 控制台应用程序中设置默认输入值？

Question

如何在 .net 控制台应用程序中设置默认输入值？

这是一些虚构的代码:

Console.Write("Enter weekly cost: ");
string input = Console.ReadLine("135"); // 135 is the default. The user can change or press enter to accept
decimal weeklyCost = decimal.Parse(input);

当然，我没想到会这么简单。我打赌必须做一些低级的、不受管理的事情；我只是不知道如何。

编辑

我知道我可以用默认值替换无输入。那不是我要问的。我正在尝试了解实现我描述的行为所涉及的内容:为用户提供可编辑的默认值。我也不担心输入验证；我的问题与此无关。

Answer 1

我相信您会通过聆听每次按键的声音来手动管理它:

快速组合示例:

   // write the initial buffer
   char[] buffer = "Initial text".ToCharArray();
   Console.WriteLine(buffer);

   // ensure the cursor starts off on the line of the text by moving it up one line
   Console.SetCursorPosition(Console.CursorLeft + buffer.Length, Console.CursorTop - 1);

   // process the key presses in a loop until the user presses enter
   // (this might need to be a bit more sophisticated - what about escape?)
   ConsoleKeyInfo keyInfo = Console.ReadKey(true);
   while (keyInfo.Key != ConsoleKey.Enter)
   {

       switch (keyInfo.Key)
       {
            case ConsoleKey.LeftArrow:
                    ...
              // process the left key by moving the cursor position
              // need to keep track of the position in the buffer

         // if the user presses another key then update the text in our buffer
         // and draw the character on the screen

         // there are lots of cases that would need to be processed (backspace, delete etc)
       }
       keyInfo = Console.ReadKey(true);
   }

这非常复杂 - 您必须确保光标不会超出范围并手动更新缓冲区。