尝试查找POCO实例的前3个属性 [英] Trying to find the top 3 properties of a POCO instance

问题描述

我有一个简单的POCO课程，其中包含学生的分数.

I have a simple POCO class that contains the student's scores.

For example:
Math - 83%
Engrish - 82%
Chemistry - 81%
Drama - 100%
etc..

有没有办法(使用 LINQ ?)我可以确定前3名按得分排序的属性?

Is there a way (using LINQ?) that I could figure out the top 3 properties ordered by score?

我假设最终对象将是匿名类型的IList< T>，它将具有两个字段.

I'm assuming the final object will be an IList<T> of an anonymous type, which will have two fields.

1. 名称(属性名称)
2. 分数(十进制值).

对象中的属性数量虽然是有限的:)

The number of properties in the object ARE finite though :)

有什么建议吗?

作为替代答案，可以在数据库中代替吗?

As an alternative answer, could this be done in a database instead?

推荐答案

您是否正在寻找类似的东西?

Are you looking for something like this?

class Notes
{
    public double Math{ get; set; }
    public double English { get; set; }
    public double Chemistry { get; set; }
    public double Drama { get; set; }
    public string IgnoreMePlease { get; set; }
}

class Program
{
    static void PrintHighestNotes(Notes notes)
    {
        var pairs = from property in notes.GetType().GetProperties()
                     where property.PropertyType == typeof (double)
                     select new
                            {
                                Name = property.Name,
                                Value = (double) property.GetValue(notes, null)
                            };
        var result = pairs.OrderByDescending(pair => pair.Value);

        foreach (var pair in result)
            Console.WriteLine("{0} = {1}", pair.Name, pair.Value);
    }

    static void Main(string[] args)
    {
        Notes notes = new Notes()
                      {
                          Chemistry = 0.10,
                          Math = 0.2,
                          Drama = 1,
                          English = 0.3,
                          IgnoreMePlease = "Ignore"
                      };
        PrintHighestNotes(notes);
    }
}

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