在字典中搜索字符串值

def search_value_in_dict(dictionary, value):
    for key, val in dictionary.items():
        if val == value:
            return key
    return "Value not found"

# 示例用法
my_dict = {"key1": "value1", "key2": "value2", "key3": "value3"}
result = search_value_in_dict(my_dict, "value2")
print(result)  # 输出：key2

public class DictionarySearch {
    public static String searchValueInDictionary(Map<String, String> dictionary, String value) {
        for (Map.Entry<String, String> entry : dictionary.entrySet()) {
            if (entry.getValue().equals(value)) {
                return entry.getKey();
            }
        }
        return "Value not found";
    }

    // 示例用法
    public static void main(String[] args) {
        Map<String, String> myDictionary = new HashMap<>();
        myDictionary.put("key1", "value1");
        myDictionary.put("key2", "value2");
        myDictionary.put("key3", "value3");

        String result = searchValueInDictionary(myDictionary, "value2");
        System.out.println(result);  // 输出：key2
    }
}

using System;
using System.Collections.Generic;

public class DictionarySearch
{
    public static string SearchValueInDictionary(Dictionary<string, string> dictionary, string value)
    {
        foreach (KeyValuePair<string, string> pair in dictionary)
        {
            if (pair.Value == value)
            {
                return pair.Key;
            }
        }
        return "Value not found";
    }

    // 示例用法
    public static void Main(string[] args)
    {
        Dictionary<string, string> myDictionary = new Dictionary<string, string>();
        myDictionary.Add("key1", "value1");
        myDictionary.Add("key2", "value2");
        myDictionary.Add("key3", "value3");

        string result = SearchValueInDictionary(myDictionary, "value2");
        Console.WriteLine(result);  // 输出：key2
    }
}