在字典中使用RegEx [英] Using RegEx in Dictionary

问题描述

我是C#的新手，看来我需要将Regex与Dictionary<string, Action>一起使用

I'm new to C#, and it looks I need to use Regex with Dictionary<string, Action>

下面的工作示例与我一起测试，以了解C#中的Regex:

The below working example with me, as testing of understanding the Regex in C#:

using System;
using System.Collections.Generic;
using System.Text.RegularExpressions;

public class Program
{


    public static void Main()
    {

        string sPattern = "word1|word2";
        string input = "word2";

        Match result = Regex.Match(input, sPattern);

        Console.WriteLine(result);
    }
}

我试图将其包含在Dictionary中，如下所示，但失败了:

I tried to include it in Dictionary as below, but failed:

var functions = new Dictionary<Match, Action>();
functions.Add(Regex.Match(string, sPattern), CountParameters);

Action action;
if (functions.TryGetValue("word1|word2", out action)) {action.Invoke(); }

它给了我invalid expression string at Regex.Match(string, sPattern)和cannot convert string to Match at .TryGetValue("word1|word2")

更新

我按如下所示重组了代码，因此没有编译错误，但结果没有打印出来:

I restructured my code like below, so I've no compiling error, but nothing is printed out as a result:

using System;
using System.Collections.Generic;
using System.Text.RegularExpressions;

public class Program
{


    public static void Main()
    {

        string sPattern1 = "word1|word2";
        string sPattern2 = "word3|word4";

        string input = "word2";

        var functions = new Dictionary<string, Action>();
        functions.Add("word1", CountParameters);
        functions.Add("word3", SomeOtherMethodName);

        Action action;
        if (functions.TryGetValue((Regex.Match(input, sPattern1)).ToString(), out action))
        {
            action.Invoke();
        }
        else
        {
            // No function with that name
        }

    }


    public static void CountParameters()
    {
    Console.WriteLine("Fn 1");
    }

    public static void SomeOtherMethodName()
    {
    Console.WriteLine("Fn 2");
    }
}

如果字符串输入="word1"，则上述方法有效.但如果字符串输入="word2"，则不起作用；正则表达式应该根据string sPattern = "word1|word2";

The above is working if string input = "word1"; but not working if string input = "word2"; while the RegEx should consider both word1 and word2 as the same based on the string sPattern = "word1|word2";

更新2

如果还不够清楚，则上面的输出应为:

In case it was not clear enough, the output of the above should be:

1. 在输入为word1或word2的情况下执行CountParameters，因为考虑到以上模式中使用的|，RegEx应该将它们视为相同.

1. Executing CountParameters in case the input is word1 or word2, as the RegEx should consider them the same considering the | used in the pattern above.

在输入为word3或word4的情况下执行SomeOtherMethodName，因为考虑到以上模式中使用的|，RegEx应该将它们视为相同.

Executing SomeOtherMethodName in case the input is word3 or word4, as the RegEx should consider them the same considering the | used in the pattern above.

依此类推，以防万一我使用|

and so on, in case I added more RegEx expression using the OR which is |

推荐答案

我认为您想要这样的东西:

I think you want something like this:

var input = "word2";
var functions = new Dictionary<Regex, Action>
{
    {new Regex("word1|word2"), CountParameters}
};
functions.FirstOrDefault(f => f.Key.IsMatch(input)).Value?.Invoke();

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