如何将文本文件中的特定值仅获取到组合框中?

本文关键字：获取组合文本文件 | 更新日期: 2023-09-27 17:52:15

所以我需要帮助，关于如何我只添加一个特定的信息到一个组合框。我和我的伙伴们正在做一个狗收容所项目，你可以买一只狗或捐赠一只狗(顺便说一句，不是真正的狗收容所。只是为了好玩而创造的)。所以当用户决定购买一只狗时，他/她可以从组合框中选择一个品种(顺便说一句，这是成功的)。然后，用户单击next按钮，以便用户可以从组合框内的列表中选择一个(问题是，组合框的项目将从文本文件中获取)。

例如，用户选择牛头犬作为一个品种，然后点击"下一步"。然后下一个窗口将显示一个组合框，其中列出了文本文件中所有的斗牛犬(狗的标签号-int-，狗的名字-string-和价格-decimal-)

文本文件是这样的:

1-Chihuahua+YY=625.00
3-Boxer+Rad=875.00
25-Terrier+Micky=1500.00
10-Bulldog+Mary=1997.500
4-Pug+Charlie=562.50
6-Bulldog+Cayne=2062.50

* (tagNumber-Breed + nameOfTheDog =价格)**one dog info =一行，不知道文本的结构怎么了

，到目前为止的代码是这样的:

  string location=@"C:''Users''LMCPENA98''Desktop''MilleniumPaws''bin''Debug''Files.txt";
        string[] temp = File.ReadAllLines(location);
        int[] TagNumber = new int[temp.Length];
        string[] Breed = new string[temp.Length];
        string[] Name = new string[temp.Length];
        decimal[] Price = new decimal[temp.Length];
        for (int i = 0; i < TagNumber.Length; i++)
        {
            TagNumber[i] = int.Parse(temp[i].Substring(0, temp[i].IndexOf("-")));
            Breed[i] = temp[i].Substring(0, temp[i].IndexOf("+"));
            Breed[i] = Breed[i].Substring(Breed[i].LastIndexOf("-") + 1);
            Name[i] = temp[i].Substring(0, temp[i].IndexOf("="));
            Name[i] = Name[i].Substring(Name[i].LastIndexOf("+") + 1);
            Price[i] = decimal.Parse(temp[i].Substring(temp[i].LastIndexOf("=") + 1));

如何在组合框中只显示两只名为Mary和Cayne的斗牛犬(包括标签号和价格)??

如何将文本文件中的特定值仅获取到组合框中?

首先以最方便的格式获取数据:

  var data = File
    .ReadLines(location)  
    .Select(line => Split('-', '+', '='))
    .Select(items => new {
       tagNumber = int.Parse(items[0]),
       breed = items[1], 
       name = items[2], 
       price = Decimal.Parse(items[3])
     });

则过滤掉并表示

  myComboBox.Items.AddRange(data
    .Where(item => (item.breed == "Bulldog") &&
                   ((item.name == "Mary") || (item.name == "Cayne"))))
    .Select(item => String.Format("tag: {0}; price: {1}", item.tagNumber, item.price)));

我已经使用了一个匿名类，但是如果这样的查询很频繁，您可能想要实现一个特殊的类来记录在文件中:

 public class Dog {
   public int TagNumber {get; private set}
   ...
   public decimal Price {get; private set}
   ...
   public static Dog Parse(String value) {...}
   ...
   public override String ToString() {
     return String.Fromat("tag: {0}; price: {1}", TagNumber, Price);  
   }
 } 

 var data = File
   .ReadLines(location) 
   .Select(line => Dog.Parse(line));
 ...
 myComboBox.Items.AddRange(data
   .Where(dog => (dog.Breed == "Bulldog") &&
                 ((dog.Name == "Mary") || (dog.Name == "Cayne"))))
   .Select(dog => dog.ToString()));

尝试:

if (Breed[i] == BreedChosen)
{
    TagNumber[i] = int.Parse(temp[i].Substring(0, temp[i].IndexOf("-")));
    Breed[i] = temp[i].Substring(0, temp[i].IndexOf("+"));
    Breed[i] = Breed[i].Substring(Breed[i].LastIndexOf("-") + 1);
    Name[i] = temp[i].Substring(0, temp[i].IndexOf("="));
    Name[i] = Name[i].Substring(Name[i].LastIndexOf("+") + 1);
    Price[i] = decimal.Parse(temp[i].Substring(temp[i].LastIndexOf("=") + 1));
}

…除非我理解错了。

我建议对代码进行整体重组。最好是创建一个类来保存狗的所有数据，例如:

public class Dog
    {
        public int tagNumber;
        public string Breed;
        public string Name;
        public decimal Price;
        public Dog()
        {
            tagNumber = 0;
            Breed = "None";
            Name = "Nameless";
            Price = 0;
        }
    }

您可以在这样的构造函数中添加任何类型的功能，它非常适合您的需要并且易于使用。然后，你可以将你的狗加载到一个简单的列表中，并按照你喜欢的方式对数据进行排序。例子:

string location=@"C:''Users''LMCPENA98''Desktop''MilleniumPaws''bin''Debug''Files.txt";
        string[] temp = File.ReadAllLines(location);
        //Now we'll get all the dogs from our text file
        List<Dog> listOfDogs =  temp
                                .Select(line => line.Split('-', '+', '='))//selecting an array of arrays with the parts of each line
                                .Select(parts => new Dog{   tagNumber = int.Parse(parts[0]),
                                                            Breed = parts[1],
                                                            Name = parts[2],
                                                            Price = Decimal.Parse(parts[3])})//we're converting those arrays of parts to an instance of our Dog class
                                .ToList();//making it list
        //Now you have your list of dogs
        //You can get all the breeds (if you need them for a combobox e.g.). Will be using hashset, so that all the equal strings would be gone
        HashSet<string> hsOfDogBreeds = new HashSet<string>(listOfDogs.Select(dog => dog.Breed));
        //Afterwards you can do quite much everything you want with the info and it's more comfortable in this way.

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