Multiple values for a single config key

问题:

I'm trying to use ConfigurationManager.AppSettings.GetValues() to retrieve multiple configuration values for a single key, but I'm always receiving an array of only the last value. My appsettings.config looks like

<add key="mykey" value="A"/>
<add key="mykey" value="B"/>
<add key="mykey" value="C"/>

and I'm trying to access with

ConfigurationManager.AppSettings.GetValues("mykey");

but I'm only getting { "C" }.

Any ideas on how to solve this?

回答1:

Try

<add key="mykey" value="A,B,C"/>

And

string[] mykey = ConfigurationManager.AppSettings["mykey"].Split(',');

回答2:

The config file treats each line like an assignment, which is why you're only seeing the last line. When it reads the config, it assigns your key the value of "A", then "B", then "C", and since "C" is the last value, it's the one that sticks.

as @Kevin suggests, the best way to do this is probably a value whose contents are a CSV that you can parse apart.

回答3:

I know I'm late but i found this solution and it works perfectly so I just want to share.

It's all about defining your own ConfigurationElement

namespace Configuration.Helpers
{
    public class ValueElement : ConfigurationElement
    {
        [ConfigurationProperty("name", IsKey = true, IsRequired = true)]
        public string Name
        {
            get { return (string) this["name"]; }
        }
    }

    public class ValueElementCollection : ConfigurationElementCollection
    {
        protected override ConfigurationElement CreateNewElement()
        {
            return new ValueElement();
        }


        protected override object GetElementKey(ConfigurationElement element)
        {
            return ((ValueElement)element).Name;
        }
    }

    public class MultipleValuesSection : ConfigurationSection
    {
        [ConfigurationProperty("Values")]
        public ValueElementCollection Values
        {
            get { return (ValueElementCollection)this["Values"]; }
        }
    }
}

And in the app.config just use your new section:

<configSections>
    <section name="PreRequest" type="Configuration.Helpers.MultipleValuesSection,
    Configuration.Helpers" requirePermission="false" />
</configSections>

<PreRequest>
    <Values>
        <add name="C++"/>
        <add name="Some Application"/>
    </Values>
</PreRequest>

and when retrieving data just like this :

var section = (MultipleValuesSection) ConfigurationManager.GetSection("PreRequest");
var applications = (from object value in section.Values
                    select ((ValueElement)value).Name)
                    .ToList();

Finally thanks to the author of the original post

回答4:

What you want to do is not possible. You either have to name each key differently, or do something like value="A,B,C" and separate out the different values in code string values = value.split(',').

It will always pick up the value of the key which was last defined (in your example C).

回答5:

I think, you can use Custom Config Sections http://www.4guysfromrolla.com/articles/032807-1.aspx

回答6:

Since the ConfigurationManager.AppSettings.GetValues() method is not working, I've used the following workaround to get a similar effect, but with the need to suffix the keys with unique indexes.

var name = "myKey";
var uniqueKeys = ConfigurationManager.AppSettings.Keys.OfType<string>().Where(
    key => key.StartsWith(name + '[', StringComparison.InvariantCultureIgnoreCase)
);
var values = uniqueKeys.Select(key => ConfigurationManager.AppSettings[key]);

This will match keys like myKey[0] and myKey[1].

回答7:

Here is full solution: code in aspx.cs

namespace HelloWorld
{
    public partial class _Default : Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            UrlRetrieverSection UrlAddresses = (UrlRetrieverSection)ConfigurationManager.GetSection("urlAddresses");
        }
    }

    public class UrlRetrieverSection : ConfigurationSection
    {
        [ConfigurationProperty("", IsDefaultCollection = true,IsRequired =true)]
        public UrlCollection UrlAddresses
        {
            get
            {
                return (UrlCollection)this[""];
            }
            set
            {
                this[""] = value;
            }
        }
    }


    public class UrlCollection : ConfigurationElementCollection
    {
        protected override ConfigurationElement CreateNewElement()
        {
            return new UrlElement();
        }
        protected override object GetElementKey(ConfigurationElement element)
        {
            return ((UrlElement)element).Name;
        }
    }

    public class UrlElement : ConfigurationElement
    {
        [ConfigurationProperty("name", IsRequired = true, IsKey = true)]
        public string Name
        {
            get
            {
                return (string)this["name"];
            }
            set
            {
                this["name"] = value;
            }
        }

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

    }
}

And in web config

<configSections>
   <section name="urlAddresses" type="HelloWorld.UrlRetrieverSection" />
</configSections>
<urlAddresses>
    <add name="Google" url="http://www.google.com" />
   <add name="Yahoo"  url="http://www.yahoo.com" />
   <add name="Hotmail" url="http://www.hotmail.com/" />
</urlAddresses>

回答8:

My take on JJS's reply: Config file:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="List1" type="System.Configuration.AppSettingsSection, System.Configuration, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
    <section name="List2" type="System.Configuration.AppSettingsSection, System.Configuration, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
  </configSections>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.2" />
    </startup>
  <List1>
    <add key="p-Teapot" />
    <add key="p-drongo" />
    <add key="p-heyho" />
    <add key="p-bob" />
    <add key="p-Black Adder" />
  </List1>
  <List2>
    <add key="s-Teapot" />
    <add key="s-drongo" />
    <add key="s-heyho" />
    <add key="s-bob"/>
    <add key="s-Black Adder" />
  </List2>

</configuration>

Code to retrieve into string[]

 private void button1_Click(object sender, EventArgs e)
    {

        string[] output = CollectFromConfig("List1");
        foreach (string key in output) label1.Text += key + Environment.NewLine;
        label1.Text += Environment.NewLine;
        output = CollectFromConfig("List2");
        foreach (string key in output) label1.Text += key + Environment.NewLine;
    }
    private string[] CollectFromConfig(string key)
    {
        NameValueCollection keyCollection = (NameValueCollection)ConfigurationManager.GetSection(key);
        return keyCollection.AllKeys;
    }

IMO, that's as simple as it is going to get. Feel free to prove me wrong :)

回答9:

I use naming convention of the keys and it works like a charm

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <configSections>
    <section name="section1" type="System.Configuration.NameValueSectionHandler"/>
  </configSections>
  <section1>
    <add key="keyname1" value="value1"/>
    <add key="keyname21" value="value21"/>
    <add key="keyname22" value="value22"/>
  </section1>
</configuration>

var section1 = ConfigurationManager.GetSection("section1") as NameValueCollection;
for (int i = 0; i < section1.AllKeys.Length; i++)
{
    //if you define the key is unique then use == operator
    if (section1.AllKeys[i] == "keyName1")
    {
        // process keyName1
    }

    // if you define the key as a list, starting with the same name, then use string StartWith function
    if (section1.AllKeys[i].Startwith("keyName2"))
    {
        // AllKeys start with keyName2 will be processed here
    }
}