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POHow to modify custom sections of the web.config file, from a generic .NET application?
 

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  1. POHow to modify custom sections of the web.config file, from a generic .NET application?
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    <p>I have a WinForm derived application (note NOT an ASP.NET web application) from where I need to modify a custom section of an arbitrary web.config file. As an example, if my web.config is something like this:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;configuration&gt; &lt;!-- General web.config stuff follows --&gt; &lt;system.web&gt; &lt;httpRuntime executionTimeout="110" maxRequestLength="1024" requestValidationMode="2.0" /&gt; &lt;/system.web&gt; &lt;MyConfigSection&gt; &lt;GeneralParameters&gt; &lt;param key="Var1" value="value1" /&gt; &lt;/GeneralParameters&gt; &lt;/MyConfigSection&gt; &lt;/configuration&gt; </code></pre> <p>I can easily modify some default parameter, say, for <code>maxRequestLength</code> I'd do this and it would work:</p> <pre><code>//Path to the web.config file string strWebConfigFile = @"C:\My files\web.config"; //Convert absolute path to virtual var configFile = new FileInfo(strWebConfigFile); var vdm = new VirtualDirectoryMapping(configFile.DirectoryName, true, configFile.Name); var wcfm = new WebConfigurationFileMap(); wcfm.VirtualDirectories.Add("/", vdm); //Open web.config file System.Configuration.Configuration config = System.Web.Configuration.WebConfigurationManager.OpenMappedWebConfiguration(wcfm, "/"); if (config != null) { System.Configuration.ConfigurationSection system_web = config.GetSection("system.web/httpRuntime"); PropertyInformation pi = system_web.ElementInformation.Properties["maxRequestLength"]; pi.Value = 1234; //Set new value //Save config.Save(ConfigurationSaveMode.Modified); } </code></pre> <p>The issue is when I try to modify my custom section. Say, if I wanted to rewrite <code>Var1</code> parameter's value with <code>value2</code>, the following:</p> <pre><code>System.Configuration.ConfigurationSection genParams = config.GetSection("MyConfigSection/GeneralParameters"); </code></pre> <p>returns <code>null</code> and if I call it with just <code>MyConfigSection</code>, it gives me this exception:</p> <blockquote> <p>An error occurred creating the configuration section handler for MyConfigSection: Could not load type 'MyWebApp.Configuration' from assembly 'System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=N'.</p> </blockquote> <p>What shall I do here to add that "configuration section handler"?</p>
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