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c#.netconfigurationconfigapp-config
Art
Art

Reputation: 3167

Different app.config appSettings based on app.config value

I have 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>

So I want if Condition == A define one set of properties and if Condition == B - different set of properties so when I switch between A and B I don't need to change all other properties. Is it possible?

Upvotes: 4

Views: 2527

Answers (2)

Art
Art

Reputation: 3167

I decided to come this way. Custom section:

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>

If only I could remove "public KeyValueConfigurationCollection Opt1" properties - it'd be perfect for me.

Upvotes: 0

ryancdotnet
ryancdotnet

Reputation: 2260

If the property names are the same for each "Condition" (environment perhaps?), then you can do this with a little coding wizardry:

(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>

Then, let's say, in your C# .NET code:

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")];

This let's you switch which set of key/values you want to use based on a single Condition key's value.

Upvotes: 3

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