（已关闭）C# 控制台自动完成/建议输入，代码改进

Question

我目前正在编写一个 C# 控制台应用程序。部分原因是用户需要输入一个相当复杂的系统名称。为了更容易，我编写了一个函数，它使用 string[] 关键字并自动完成用户输入的字符串 - 在运行时。

代码可以正常工作并按预期运行，但我很好奇如何改进代码（例如可用性、效率）。另外，缺少哪些功能，这是您所期望的？

感谢您的反馈！

            if (Keywords.Length == 0)
                throw new Exception("No Keywords set!");

            bool searching          = true;                 // true while looking for the keyword
            Console.CursorVisible   = true;                 // To help users understand where they are typing
            string System           = "";                   // Initialization of output
            string suggestion       = Keywords[0];          // Initialization of default suggestion
            int toClear             = suggestion.Length;    // Get the length of the line that needs to be cleared

            while (searching)
            {
                Console.Write(new String(' ', toClear));    // Clear line
                Console.CursorLeft = 0;                     // Relocate cursor to line start
                Console.Write(System);                      // Write what has been written previously

                if(suggestion != "")                        // If there is a suggestion fitting the entered string,
                {                                           // complete the string in color and reset the cursor
                    int col = Console.CursorLeft;
                    Console.ForegroundColor = ConsoleColor.Magenta;
                    Console.Write(suggestion.Substring(System.Length));
                    Console.ForegroundColor = ConsoleColor.White;
                    Console.CursorLeft      = col;
                }

                string tempInput = Console.ReadKey().KeyChar.ToString();

                if (tempInput.Equals("\r"))                 // Evaluate input:
                {                                           //  -> Enter
                    if (!suggestion.Equals(""))             //     Valid entry?
                    {
                        searching   = false;
                        System      = suggestion;           //      -> use suggestion
                    }
                }
                else if (tempInput.Equals("\b"))            // Deleting last sign
                {
                    if(System.Length>0)
                        System = System.Substring(0, System.Length - 1);
                }
                else                                        // Any other sign is added to the string
                    System      += tempInput;

                // Set length to clear, if suggestion == "", the system string length needs to be cleared
                toClear = (System.Length>suggestion.Length) ? System.Length : suggestion.Length;

                // Reset suggestion. If no match is found, suggestion remains empty
                suggestion = "";

                // Check keywords for suggestion
                for(int i= 0; i<Keywords.Length; i++)
                {
                    if (Keywords[i].StartsWith(System))
                    {
                        suggestion = Keywords[i];
                        break;
                    }
                }
            }

            // reset cursor visibility
            Console.CursorVisible = false;

            return System;

Answer 1

1. Do not raise reserved exception types

   if (Keywords.Length == 0)
       throw new Exception("No Keywords set!");
   

   改为使用

   if (Keywords.Length == 0)
       throw new ArgumentException(nameof(Keywords), "No Keywords set!");
   

2. 我不会使用 System 作为变量名。 System 是一个非常常见的命名空间。

3. 不确定是不是格式问题，但是赋值之间的制表符不一致，导致代码更难阅读

4. 您计算要清除的长度，但从不使用它

   // 设置长度清零，如果建议== ""，系统字符串长度需要清零 toClear = (System.Length>suggestion.Length) ？ System.Length : 建议.Length;