无法获取值，只能获取密钥

Question

我正在尝试使用配置部分和配置元素。 没有得到价值只得到了钥匙。 我有一个这样的 app.config：

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>   
    <sectionGroup name="ProductSettings">
      <section name="DellSettings" type="System.Configuration.NameValueSectionHandler"/>
    </sectionGroup>
  </configSections>
  <ProductSettings>
    <DellSettings>
      <add key = "ProductNumber" value="20001" ></add>
      <add key =" ProductName" value="Dell Inspiron"></add>
      <add key ="Color" value="Black"></add>
      <add key =" Warranty" value ="2 Years" ></add>
    </DellSettings>
  </ProductSettings>
  <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1" />
    </startup>
</configuration>

产品设置类

像这样：

 public class ProductSettings : ConfigurationSection
    {
        [ConfigurationProperty("DellSettings", IsRequired = true)]
        public DellFeatures DellFeatures
        {
            get
            {
                return (DellFeatures)this["DellSettings"];
            }
        }
    }

DellFeatures 类

像这样解析配置中的每个元素

 public class DellFeatures : ConfigurationElement
    {
        [ConfigurationProperty("ProductNumber", IsRequired = true)]
        public int ProductNumber
        {
            get
            {
                return (int)this["ProductNumber"];
            }
        }

        [ConfigurationProperty("ProductName", IsRequired = true)]
        public string ProductName
        {
            get { return (string)this[nameof(ProductName)]; }
            set { this[nameof(ProductName)] = value; }

        }

        [ConfigurationProperty("Color", IsRequired = false)]
        public string Color
        {
            get
            {
                return (string)this["Color"];
            }
        }
        [ConfigurationProperty("Warranty", IsRequired = false)]
        public string Warranty
        {
            get
            {
                return (string)this["Warranty"];
            }
        }
    }

主类代码如下：

    static void Main(string[] args)
    {
        var productSettings =
            ConfigurationManager.GetSection("ProductSettings/DellSettings") as NameValueCollection;
        if (productSettings == null)
        {
            Console.WriteLine("Product Settings are not defined");
        }
    }

我只能看到键而不是值。我哪里做错了。

Answer 1

变化必须发生在下面

1. 当你设置程序集和类型（FQN）时，你必须像下面这样注册

   <section name="BlogSettings" type="Fully.Qualified.TypeName.ProductSettings,   
    AssemblyName" />
   

2. 当你尝试添加配置时，你必须像下面这样使用

   <DellSettings
        ProductNumber="20001"  .../>
   

这应该在配置端完成，当您要访问代码中的配置值时，您可以尝试以下方式

int productNo = DellSettings.Settings.ProductNumber;
Console.WriteLine(productNo);

如果有任何工作示例，请参考以下链接 https://haacked.com/archive/2007/03/12/custom-configuration-sections-in-3-easy-steps.aspx/