链接app.config中的自定义配置节

本文关键字：自定义 配置 app config 链接 | 更新日期: 2023-09-27 18:06:04

我的app.config有这些自定义部分:

<Animals>
  <add Type="Elephant" Name="Dumbo" Age="22" />
  <add Type="Giraffe" Name="Shorty" Age="5" />
  <add Type="Giraffe" Name="Mike" Age="7" />
  <add Type="Lion" Name="Shaggy" Age="2" />
</Animals>

<Zoos>
  <add Name="New York Zoo" Animals="Dumbo,Shorty" />
  <add Name="Paris Zoo" Animals="Mike,Shaggy" />
</Zoos>

我有这些标准类:Animal, AnimalCollection, Zoo, ZooCollection。

Zoo完全符合预期，看起来像这样:

public class Zoo : ConfigurationElement {
  [ConfigurationProperty("Name", IsRequired=true)]
  public string Name { get { return base["Name"] as string; } }
  // I don't want this:
  [ConfigurationProperty("Animals", IsRequired=true)]
  public string Animals { get { return base["Animals"] as string; } }
  // I want something like this:
  /*
  [ConfigurationProperty("Animals", IsRequired=true)]
  public IEnumerable<Animal> Animals { get { return ...?
  */
}

所以Zoo.Animals是Animal实例名称的CSV字符串。但是我想要的是一个IEnumerable<Animal>属性。

我该怎么做?

链接app.config中的自定义配置节

基本上，您需要提供一种将逗号分隔的字符串值转换为IEnumerable的方法。这可以通过提供一个定制的TypeConverter来实现。所以你的Zoo类应该是这样的:

public class Zoo : ConfigurationElement
{
    [ConfigurationProperty("Name")]
    public string Name
    {
        get { return (string)base["Name"]; }
    }
    [TypeConverter(typeof(AnimalConverter))]
    [ConfigurationProperty("Animals")]
    public IEnumerable<Animal> Animals
    {
        get { return (IEnumerable<Animal>)base["Animals"]; }
    }
}

和AnimalConverter是:

public class AnimalConverter : TypeConverter
{
    public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
    {
        AnimalCollection animals = AnimalSettings.Settings.AnimalList;
        List<Animal> result = new List<Animal>();
        foreach (string animalName in value.ToString().Split(','))
        {
            foreach (Animal animal in animals)
            {
                if (animalName == animal.Name)
                {
                    result.Add(animal);
                }
            }
        }
        return result;
    }
}

当我用一个控制台应用程序测试它时:

class Program
{
    static void Main(string[] args)
    {
        AnimalCollection animals = AnimalSettings.Settings.AnimalList;
        foreach (Animal animal in animals)
        {
            Console.WriteLine($"{animal.Name}'t't{animal.Age}'t't{animal.Type}");
        }
        Console.WriteLine();
        ZooCollection zoos = ZooSettings.Settings.ZooList;
        foreach (Zoo zoo in zoos)
        {
            Console.WriteLine(zoo.Name);
            foreach (Animal animal in zoo.Animals)
            {
                Console.WriteLine($"{animal.Name}'t't{animal.Age}'t't{animal.Type}" );
            }
            Console.WriteLine();
        }
    }
}

我得到了这些结果:

Dumbo           22              Elephant
Shorty          5               Giraffe
Mike            7               Giraffe
Shaggy          2               Lion
New York Zoo
Dumbo           22              Elephant
Shorty          5               Giraffe
Paris Zoo
Mike            7               Giraffe
Shaggy          2               Lion

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