c＃Alpha电话号码转换器 [英] c# Alpha Telephone Number Translator

问题描述

我有一个家庭作业，程序将接受与555-GET-FOOD类似的格式的任何电话号码。任务是将字母字母映射到数字，并将数字转换为数字等价物。

例如：A，B，C = 2; D，E，F = 3;等等...

I have a homework assignment where the program will accept any phone number in the format similar to 555-GET-FOOD. The task is to map the alphabetic letters to numbers and translate the number to its numeric equivalent.
For example: A, B, C = 2; D, E, F = 3; etc...

我们目前还没有涵盖类或创建地图，所以这些不是可行的解决方案。本章将介绍枚举，因此我正在使用枚举类型来解决这个问题。我有一个设置验证数据的方法（确保正确的字符数，连字符在正确的位置），这样做正常。我有另一种方法设置为删除连字符，并使用ToUpper（）方法，这也可以正常工作，所以foreach循环我已经设置了我们使用这两个方法已经完成后的数字。

We have not covered Classes or creating maps at this point so these would not be viable solutions. This chapter does cover the enum so I am working to solve using an Enumerated type. I have a method set up to validate the data (ensure the correct # of characters and the hyphens are in the correct place) and this does work correctly. I have another method set up to remove the hyphens and also uses the ToUpper() method and this also works correctly, so the foreach loop I have set up us using the number after these two methods have already finished.

我还设置了一个在转换发生后运行的方法来添加连字符，这也可以使用。

I have also set up a method to run after the conversion takes place to add the hyphens back in and this also works.

我已经尝试了几种方法来获得工作，并留下他们注意到他们可能是我需要使用的机会，因为我尝试使用开关声明我现在只用字母A设置，如果能够使其工作，计划完成剩余的字母。我认为我的问题是foreach循环是使用一个char类型，并且交换机正在使用一个int。在foreach循环中尝试代码时似乎也是一样的问题，但我不知道如何修复，所以任何建议都不胜感激。

I have tried several ways to get is to work and have left them in commented out on the chance they might be what I need to use, for my attempt with the switch statement I only set up with the letter A for now, and plan to finish the remaining letters if I am able to get this to work. I think the one my issues is the foreach loop is using a char type and the switch is using an int. Seems to be the same issue when trying the code inside the foreach loop but I am not sure how to fix so any suggestions are appreciated.

public enum AlphaNumber
{ 
    A=2, B=2, C=2, D=3, E=3, F=3, G=4, H=4, I=4, J=5, K=5, L=5, 
    M=6, N=6, O=6, P=7, Q=7, R=7, S=8, T=8, U=8, V=9, W=9, X=9, Y=9, Z=9
}
 private void UpdatePhone(AlphaNumber phone)
    {
        switch (phone)
        {
            case AlphaNumber.A:
           //return AlphaNumber.(int[])Enum.GetValues(typeof(AlphaNumber));
           //return (Enum.GetValues(typeof(AlphaNumber)));
           //   (int)ValueType;
                Enum.GetValues(typeof(AlphaNumber));
                break;                   
        }
private void translateButton_Click(object sender, EventArgs e)
    {
        numberLabel.Text = "";//Clear the numberLabel
        //Get a trimmed copy of the user's input.  
        string input = numberTextBox.Text.Trim();

        if (IsValidFormat(input))
        {
            Unformat(ref input);

            foreach (char ch in input)
            {
                if (char.IsLetter(ch))//                    {
                    ch = (char)Enums.AlphaNumber.Active;
                    //ch = (char)Enum.GetValues(typeof(AlphaNumber));
                    //ch = Enum.TryParse(AlphaNumber);
                   // ch = AlphaNumber.(int[])Enum.GetValues(typeof(AlphaNumber));
                    //UpdatePhone(ch);
                   MessageBox.Show("Character is char");                    }
            }

            TelephoneFormat(ref input);    
            numberLabel.Text = input;

我可以接受任何建议，感谢提供的任何帮助。需要帮助的地方在foreach循环中，我正在查看每个值，如果是一个字母，我想从枚举值中获取值，并用数字值替换char。

I am open to any suggestions and appreciate any help provided. Where I need help is inside the foreach loop, I am looking at each value and if it is a letter I want to get the value from the enum values and replace the char with the number value.

推荐答案

删除枚举和 ，而是对地图进行查找。我创建了一个.NET小提琴，演示如何按需要这里工作。

Drop the enum and the switch, and instead do a lookup against a map. I have created a .NET Fiddle that demonstrates this working as desired here.

但是如果使用 Dictionary< char，char> 是出于某些奇怪的原因，那么我想你可以使用此版本 - 其中我使用枚举。这是更多的工作，更多的移动部分，你更难维护。

But if using a Dictionary<char, char> is for some odd reason out of question, then I suppose you could use this version -- in which I use the enum. It is just a lot more work and the more moving parts you have the harder it is to maintain.

在 C＃类型枚举默认从 int 继承，但您可以指定各种其他数字类型，如 byte 或 long 等...其中一个关键的手段是从一种类型的拳击/拆箱和铸造/转换的概念到另一个如果您有枚举定义为枚举Foo {Bar = 63} 和 cast 到 char 你会期望得到什么？

In C# the type enum inherits from int by default, but you can specify various other numeric types -- like byte or long, etc... One of the key takeaways is the concept of boxing/unboxing and casting/converting from one type to another. If you have an enum defined as enum Foo { Bar = 63 } and you try to cast it to a char what would you expect to get?

这实际上会导致char ？ - 看看 ASCII表，并找到63 $的 DEC 在 Char 列映射到的位置。

This actually would result in the char ? -- take a look at the ASCII table and the find the DEC for 63 and look at what it maps to for the Char column.

这个疯狂的复杂问题是固定的： p>

The issue is fixed with this crazy complicated mess:

    public enum AlphaNumber
    { 
        A=2, B=2, C=2, D=3, E=3, F=3, G=4, H=4, I=4, J=5, K=5, L=5, 
        M=6, N=6, O=6, P=7, Q=7, R=7, S=8, T=8, U=8, V=9, W=9, X=9, Y=9, Z=9
    }

    public static class PhoneNumber
    {
        public static char ParseInput(char input)
        {
            if (input == '-' || char.IsDigit(input))
            {
                return input;
            }

            if (char.IsLetter(input))
            {
                var num = (AlphaNumber)(Enum.Parse(typeof(AlphaNumber), (char.IsLower(input) ? char.ToUpperInvariant(input) : input).ToString()));
                return ((int)num).ToString()[0];
            }

            return '\0';
        }
    }

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