使用字典中的键获取值

Question

使用我的代码，我在获取值时遇到了问题，该值是使用关键字本身的单词数那是我的代码，

 public static void essintial(string UserCorpus, string word)
    {
       // string str = "Alameer Ashraf Hassan Alameer ashraf,elnagar.";

        string[] CorpusResult = UserCorpus.Split(' ', ',', '.');

       //Creating the Dictionary to hold up each word as key & its occurance as Value  ......! 
        Dictionary<string, int> Dict = new Dictionary<string, int>(StringComparer.OrdinalIgnoreCase);

       //looping over the corpus and fill the dictionary in .........!
        foreach (string item in CorpusResult)
        {
            if (item != "")
            {
                if (Dict.ContainsKey(item) == false)
                {
                    Dict.Add(item, 1);
                }
                else
                {
                    Dict[item]++;
                }
            }
        }

        //Console.WriteLine(Dict);
        foreach (var item in Dict)
        {
            Console.WriteLine(item);
        }


        int ss = Dict[word];
        Console.WriteLine(ss);
}

钥匙出问题了

Answer 1

我不知道你到底遇到了什么问题，但我有一个想法。一个问题可能是您提供的单词不在字典中。这可能会导致 KeyNotFoundException。一个简单的修复是这样的：

if(Dict.ContainsKey(word)){
    Console.WriteLine(Dict[word]);
} else {
    Console.WriteLine(0); //Or whatever you deem appropriate
}

您可能遇到的另一个问题是 foreach(var item in Dict)。字典迭代元素对。变量 item 的推断类型为 KeyValuePair<string,int> 并且 Console.WriteLine(item); 可能不会打印您期望的内容。尝试用 Console.WriteLine(item.Key + " " +item.Value);

替换 Console.WriteLine(item)

Answer 2

试试这个：

string str = "Alameer Ashraf Hassan Alameer ashraf,elnagar.";

        string[] CorpusResult = str.Split(' ', ',', '.');

       //Creating the Dictionary to hold up each word as key & its occurance as Value  ......! 
        Dictionary<string, int> Dict = new Dictionary<string, int>();

       //loopnig over the corpus and fill the dictionary in .........!
        foreach (string item in CorpusResult)
        {
            if (string.IsNullOrEmpty(item)) continue;

            if (Dict.ContainsKey(item))
            {
                Dict[item]++;
            }
            else
            {
                Dict.Add(item, 1);
            }
        }

        Console.WriteLine("Method 1: ");
        foreach (var item in Dict)
        {
            Console.WriteLine(item.Value);
        }

        Console.WriteLine("Method 2: ");
        foreach(var k in Dict.Keys)
        {
            Console.WriteLine(Dict[k]);
        }

.NET Fiddle: https://dotnetfiddle.net/JZ9Eid

使用字典中的键获取值

get out the value by using a key in the dictionary

c#

dictionary

key-value