Question

我需要帮助按字母顺序排序已经读入列表框的文本文件。有没有办法可能让列表框对包含在文本文件中的这组数据进行排序：

pizza, margherita, regular, 4.40, dough, 1.00, sauce, 0.25, mozzarella, 0.75
pizza, margherita, large, 5.40, dough, 1.44, sauce, 0.36, mozzarella, 1.08
pizza, margherita, extra-large, 7.50, dough, 1.79, sauce, 0.45, mozzarella, 1.34
pizza, pepperoni, regular, 5.00, dough, 1.00, sauce, 0.25, mozzarella, 0.75, pepperoni, 2.0
pizza, pepperoni, large, 6.00, dough, 1.44, sauce, 0.36, mozzarella, 1.08, pepperoni, 2.88
pizza, pepperoni, extra-large, 10.00, dough, 1.79, sauce, 0.45, mozzarella, 1.342, pepperoni, 3.58
pizza, hawaiian, regular, 5.50, dough, 1.00, sauce, 0.25, mozzarella, 0.75, ham, 1.50, pineapple, 0.5
pizza, hawaiian, large, 6.50, dough, 1.44, sauce, 0.36, mozzarella, 1.08, ham, 2.16, pineapple, 0.72
pizza, hawaiian, extra-large, 11.00, dough, 1.79, sauce, 0.45, mozzarella, 1.34, ham, 2.69, pineapple, 0.90
pizza, vegetable, regular, 5.40, dough, 1.00, sauce, 0.25, mozzarella, 0.75, olives, 0.75, spinach, 0.25, mushrooms, 1.00
pizza, vegetable, large, 6.40, dough, 1.44, sauce, 0.36, mozzarella, 1.08, olives, 1.08, spinach, 0.36, mushrooms, 1.44
pizza, vegetable, extra-large, 10.00, dough, 1.79, sauce, 0.45, mozzarella, 1.342, olives, 1.34, spinach, 0.45, mushrooms, 1.79
pizza, meaty, regular, 5.50, dough, 1.00, sauce, 0.25, mozzarella, 0.75, chicken, 0.50, beef, 0.50, ham, 0.25, pepperoni, 0.25
pizza, meaty, large, 6.50, dough, 1.44, sauce, 0.36, mozzarella, 1.08, chicken, 0.72, beef, 0.72, ham, 0.36, pepperoni, 0.36
pizza, meaty, extra-large, 13.00, dough, 1.79, sauce, 0.45, mozzarella, 1.34, chicken, 1.08, beef, 1.08, ham, 0.45, pepperoni, 0.45
burger, beef, regular, 2.30, bun, 1, beef patty, 1
burger, beef, large, 3.40, bun, 1, beef patty, 2
burger, chicken, regular, 3.00, bun, 1, chicken fillet, 1
burger, chicken, large, 4.10, bun, 1, chicken fillet, 2
burger, vegetarian, regular, 2.50, bun, 1, falafel, 1
burger, vegetarian, large, 3.60, bun, 1, falafel, 2
sundry, chips, regular, 1.20, chips, 1
sundry, onion-rings, regular, 1.70, onion rings, 1
sundry, coleslaw, regular, 1.00, coleslaw,

Answer 1

启用Sorted Property为true

listBox1.Sorted = true;

Answer 2

无论如何，您是否可以更改存储值的方式？

例如。

Burger，Vegetarian，Large，3.60，bun，1，沙拉三明治，2个逗号分隔线。

怎么样

汉堡，素食，大，3.60，发髻：1 |沙拉三明治：2然后你会知道你有产品，类型，尺寸，价格，成分和成分是'|'分开，并且名称和数量之间的'：'。

无论如何，如果它被设置为你可以将其读入对象列表或字典，那么列表框中的每个项目都可以将Key作为值，那么你可以使用其他值在代码中容易。

public class FoodItem
{
   public string FoodCategory {get;set;}
   public string FoodType {get;set;}
   public string Size {get;set;}
   public double Price {get;set;}
   public List<Ingredient> Ingredients {get;set;}
}

public class Ingredient
{
   public string Name {get;set;}
   public int Quantity {get;set;}
}

然后，当您阅读文本字段时，将每行解析为食物项目的实例。

另一个问题是逐行阅读文本文件。

https://stackoverflow.com/a/7980605/7683170

Answer 3

为了建立Rob的答案，您还可以在FoodItem类上创建一个静态方法，该方法知道如何从逗号分隔的字符串创建FoodItem。您可以在读取文件时调用此方法，以简化生成食物项列表。

此外，覆盖这些类的ToString()属性也使得显示项目变得更加容易。

以下是FoodItem类，其中添加了一些内容：

public class FoodItem
{
    public string FoodCategory { get; set; }
    public string FoodType { get; set; }
    public string Size { get; set; }
    public double Price { get; set; }
    public List<Ingredient> Ingredients { get; set; }

    public FoodItem()
    {
        Ingredients = new List<Ingredient>();
    }

    public static FoodItem CreateFromCommaString(string commaSeparatedValues)
    {
        var foodItem = new FoodItem();
        if (string.IsNullOrWhiteSpace(commaSeparatedValues)) return foodItem;

        var values = commaSeparatedValues.Split(',')
            .Select(value => value.Trim()).ToList();

        double price;
        foodItem.FoodCategory = values[0];
        if (values.Count > 1) foodItem.FoodType = values[1];
        if (values.Count > 2) foodItem.Size = values[2];
        if (values.Count > 3 && double.TryParse(values[3], out price))
        {
            foodItem.Price = price;
        }

        if (values.Count > 4)
        {
            for (int i = 4; i < values.Count; i += 2)
            {
                var ingredient = new Ingredient {Name = values[i]};
                double qty;
                if (values.Count > i + 1 && double.TryParse(values[i + 1], out qty))
                {
                    ingredient.Quantity = qty;
                }
                foodItem.Ingredients.Add(ingredient);
            }
        }

        return foodItem;
    }

    public override string ToString()
    {
        return string.Format("{0}: {1} ({2}) = ${3:0.00}. Contains: {4}",
            FoodCategory, FoodType, Size, Price, string.Join(", ", Ingredients));
    }
}

Ingredient类ToString覆盖：

public class Ingredient
{
    public string Name { get; set; }
    public double Quantity { get; set; }
    public override string ToString()
    {
        return $"{Name}: {Quantity}";
    }
}

然后，填充类的列表很简单：只获取所有文件行，并为每个文件行生成一个新的FoodItem并将其添加到列表中。完成后，您可以使用OrderBy和ThenBy按多个字段对列表进行排序：

private static void Main()
{
    var filePath = @"f:\public\temp\temp.txt";

    var foodItems = new List<FoodItem>();

    foreach (var fileLine in File.ReadAllLines(filePath))
    {
        foodItems.Add(FoodItem.CreateFromCommaString(fileLine));
    }

    var sortedItems = foodItems
        .OrderBy(item => item.FoodCategory)
        .ThenBy(item => item.FoodType)
        .ThenBy(item => item.Price)
        .ToList();

    sortedItems.ForEach(Console.WriteLine);

    Console.Write("\nDone!\nPress any key to exit...");
    Console.ReadKey();
}

输出（点击放大）：

C＃ - 按字母顺序对列表框进行排序

3 个答案: