基于 app.config 值的不同 app.config appSettings

Question

我有app.config

<?xml version="1.0" encoding="utf-8"?>
<configuration>
    <appSettings>       
        <!--One set of properties-->
        <add key="Condition" value="A"/>
        <add key="DependingPropertyA" value="B"/>
        <add key="DependingPropertyB" value="C"/>
        <!--Another set of properties-->
        <add key="Condition" value="B"/>
        <add key="DependingPropertyA" value="D"/>
        <add key="DependingPropertyB" value="E"/>
    </appSettings>
</configuration>

所以我想要 if Condition == A 定义一组属性，if Condition == B - 不同的属性集，这样当我在 A 和 B 之间切换时，我不需要更改所有其他属性。可能吗？

Answer 1

如果每个 "Condition" 的属性名称都相同（也许是环境？），那么您可以通过一些编码技巧来做到这一点：

(App.Config:)

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <appSettings>       

    <!--Condition 'selector', change value to 'CondB' when you want to switch-->
    <add key="Condition" value="CondA"/>

    <add key="CondA.DependingPropertyA" value="B"/>
    <add key="CondA.DependingPropertyB" value="C"/>
    <add key="CondB.DependingPropertyA" value="D"/>
    <add key="CondB.DependingPropertyB" value="E"/>
  </appSettings>
</configuration>

然后，假设在您的 C# .NET 代码中：

string keyPrepend = System.Configuration.ConfigurationManager.AppSettings["Condition"];

string propAValue = System.Configuration.ConfigurationManager.AppSettings[String.Format("{0}.{1}", keyPrepend, "DependingPropertyA")];
string propBValue = System.Configuration.ConfigurationManager.AppSettings[String.Format("{0}.{1}", keyPrepend, "DependingPropertyB")];

这让您可以根据单个条件键的值切换要使用的 key/values 组。

Answer 2

我决定走这条路。自定义部分：

using System.Configuration;

namespace ConditionalConfig
{
    public class ConditionalConfigurationSection : ConfigurationSection
    {
        [ConfigurationProperty("selector", IsRequired = true, IsDefaultCollection = true)]
        public string Selector
        {
            get { return (string) base["selector"]; }
            set { base["selector"] = value; }
        }

        public new string this[string key]
        {
            get
            {
                var result = Shared[key] ?? ((KeyValueConfigurationCollection) base[Selector])[key];
                return result != null ? result.Value : null;
            }
        }

        [ConfigurationProperty("", IsRequired = true, IsDefaultCollection = true)]
        public KeyValueConfigurationCollection Shared
        {
            get { return (KeyValueConfigurationCollection) base[""]; }
        }

        [ConfigurationProperty("opt1", IsRequired = true)]
        public KeyValueConfigurationCollection Opt1
        {
            get { return (KeyValueConfigurationCollection) base["opt1"]; }
        }

        [ConfigurationProperty("opt2", IsRequired = true)]
        public KeyValueConfigurationCollection Opt2
        {
            get { return (KeyValueConfigurationCollection) base["opt2"]; }
        }
    }
}

app.config:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="conditional" type="ConditionalConfig.ConditionalConfigurationSection, ConditionalConfig" />
  </configSections>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
    </startup>
  <conditional selector="opt2">
    <add key="test" value="value"/>
    <opt1>
      <add key="test1" value="value1"/>
    </opt1>
    <opt2>
      <add key="test1" value="value2"/>
    </opt2>
  </conditional>
</configuration>

要是我能删除 "public KeyValueConfigurationCollection Opt1" 属性就好了 - 这对我来说太完美了。

基于 app.config 值的不同 app.config appSettings

Different app.config appSettings based on app.config value

.net

c#

configuration

app-config

config