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app.config (SIMPLE)

Posted on 2007-03-30
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Last Modified: 2012-06-22
I am planning on using the app.config file to read in some user defined data.  I have a number of form names that will continually change over time.

Can I have the same key listed twice?

<add key=FormName value=RothIRA>
<addkey=FormName value=TOA>

etc...

I was hoping to loop through (in code) and check for all of the FormNames.  Anything found in the appConfig.....I'll be applying logic to in my app.

Is it possible to list multiple entries with the same key name?   Is there a better way to go about this?

thx.

Knoxxx
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Question by:JohnnyKnoxville
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Expert Comment

by:_TAD_
ID: 18826425

No, each key must be unique.

On the other hand, if you use XML, and serialize the data into a class, you can easily create an array of values.
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Expert Comment

by:_TAD_
ID: 18826472
Here's a sample from code that I use all the time:

[App.Config]



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

  <configSections>
    <section name="Section1"
             type="ConfigSectionHandler.ConfigSectionHandler, ConfigSectionHandler" />
    <section name="Section2"
             type="ConfigSectionHandler.ConfigSectionHandler, ConfigSectionHandler" />
  </configSections>

  <Section1 type="Namespace.Class, Namespace">
     <FormName>MyForm1</FormName>
     <FormName>MyForm2</FormName>
     <FormName>MyForm3</FormName>
     <FormName>MyForm4</FormName>
     <FormName>MyForm5</FormName>
  </Section1>
</configuration>
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Expert Comment

by:_TAD_
ID: 18826481
[Add this class to your application]


using System;
using System.Xml;
using System.Xml.XPath;
using System.Xml.Serialization;
using System.Configuration;

namespace ConfigSectionHandler
{
    /// <summary>
    /// This class contains only one method, Create().
    /// This is designed to handle custom sections in an Applications Configuration file.
    /// By Implementing <see cref="IConfigurationSectionHandler"/>, we can implement the
    /// Create method, which will provide the XmlNode from the configuration file. This is
    /// Deserialized into an object and passed back to the Caller.
    /// </summary>
    /// <example>
    /// Here is a configuration file entry in the <c>configSections</c> sectikon of the <c>App.Config</c>
    /// file.
    ///<code>      ///
    ///&lt;section name="ServerConfig" type="ConfigSectionHandler.ConfigSectionHandler, ConfigSectionHandler" /&gt;
    ///</code>
    ///This tells the CLR that there is a section further in, with a node name of <c>ServerConfig</c>. When this section
    ///is to be parsed, an object of type <c>ConfigSectionHandler.ConfigSectionHandler</c> which resides in the
    ///assembly <c>ConfigSectionHandler</c> will be instantiated. The CLR automatically calls a method in that object
    ///called <c>Create</c>
    ///</example>
    public class ConfigSectionHandler : IConfigurationSectionHandler
    {
        public ConfigSectionHandler()
            : base()
        {
        }

        #region IConfigurationSectionHandler Members

        /// <summary>
        /// A method which is called by the CLR when parsing the App.Config file. If custom sections
        /// are found, then an entry in the configuration file will tell the runtime to call this method,
        /// passing in the XmlNode required.
        /// </summary>
        /// <param name="parent">The configuration settings in a corresponding parent configuration section. Passed in via the CLR</param>
        /// <param name="configContext">An <see cref="HttpConfigurationContext"/> when Create is called from the ASP.NET configuration system. Otherwise,
        /// this parameter is reserved and is a null reference (Nothing in Visual Basic). Passed in via the CLR</param>
        /// <param name="section">The <see cref="XmlNode"/> that contains the configuration information from the configuration file.
        /// Provides direct access to the XML contents of the configuration section.       Passed in via the CLR.</param>
        /// <returns>The Deserialized object as an object</returns>
        /// <exception cref="System.Configuration.ConfigurationException">The Configuration file is not well formed,
        /// or the Custom section is not configured correctly, or the type of configuration handler was not specified correctly
        /// or the type of object was not specified correctly.
        /// or the copn</exception>
        public object Create(object parent, object configContext, System.Xml.XmlNode section)
        {
            try
            {
                XPathNavigator xNav = section.CreateNavigator();
                string typeOfObject = (string)xNav.Evaluate("string(@type)");
                Type t = Type.GetType(typeOfObject);
                XmlSerializer ser = new XmlSerializer(t);
                XmlNodeReader xNodeReader = new XmlNodeReader(section);
                return ser.Deserialize(xNodeReader);
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
                if (e.InnerException.Message.Length > 0)
                    Console.WriteLine(e.InnerException.Message);
                return null;
            }
           
        }
        #endregion
    }
}
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LVL 22

Expert Comment

by:_TAD_
ID: 18826504
[Create a class that you serialize your app.config data to]

using System;
using System.Collections.Generic;
using System.Text;
using System.Xml;
using System.Xml.Serialization;

namespace Application1
{
    [XmlRoot("Section1")]
    public class FirstSection
    {
        [XmlElement("FormName")]
        public string[] _formName;    }
}
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LVL 22

Accepted Solution

by:
_TAD_ earned 50 total points
ID: 18826530
[Putting it all together]

<Button1_Click>

// use configuration manager class to pull proper app.config section
// and serialize it to a class
Section1 s1 = (Section1)ConfigurationManager.GetSection("Section1");

// itterate through class data collection
for(int i=0; i<s1._formName.Length; i++)
   Console.Writeline(s1._formName[i]);
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