当使用ConfigurationManager.OpenMappedExeConfiguration时,如何从ConfigSection中获取定义为NameValueSectionHandler的值 [英] How do I get the values from a ConfigSection defined as NameValueSectionHandler when using ConfigurationManager.OpenMappedExeConfiguration
问题描述
当您使用应用程序的当前配置文件时,从使用由System.Configuration.NameValueSectionHandler定义的部分的配置文件获取值很容易。
Getting the values from a config file that uses a section defined by System.Configuration.NameValueSectionHandler is easy when you're using the current config file for the application.
示例配置文件。
<configuration>
<configSections>
<section name="MyParams" type="System.Configuration.NameValueSectionHandler" />
</configSections>
<MyParams>
<add key="FirstParam" value="One"/>
<add key="SecondParam" value="Two"/>
</MyParams>
</configuration>
示例代码可以方便地读取。
Example Code that easily reads it.
NameValueCollection myParamsCollection =
ConfigurationManager.GetSection("MyParams") as NameValueCollection;
这是不起作用的代码。
NameValueCollection collection =
ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None)
.GetSection("MyParams") as NameValueCollection;
编译时出现以下错误。
无法通过引用转换,装箱转换,取消装箱转换,换行或空类型转换将类型System.Configuration.ConfigurationSection转换为System.Collections.Specialized.NameValueCollection。
Cannot convert type 'System.Configuration.ConfigurationSection' to 'System.Collections.Specialized.NameValueCollection' via a reference conversion, boxing conversion, unboxing conversion, wrapping conversion, or null type conversion.
ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None)返回System.Configuration.Configuration,Configuration.GetSection返回ConfigurationSection。
ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None) returns a System.Configuration.Configuration, and Configuration.GetSection returns ConfigurationSection.
ConfigurationManager.GetSection返回对象。
ConfigurationManager.GetSection returns object.
那么,当我必须使用OpenExeConfiguration时,如何获取我的NameValueCollection?
So, how do I get back my NameValueCollection when I have to use OpenExeConfiguration?
推荐答案
我在两年前遇到了我自己的回答。
I ran across my own answer from two years ago.
NameValueSectionHandler - 我可以使用这个部分类型写回应用程序配置文件吗?
NameValueSectionHandler - can i use this section type for writing back to the application config file?
这是我的方法来解决我当前的问题。 / p>
This is my approach to solve my current issue.
ExeConfigurationFileMap configFileMap = new ExeConfigurationFileMap() {
ExeConfigFilename = "path to config here"
};
Configuration config = ConfigurationManager.OpenMappedExeConfiguration(
configFileMap, ConfigurationUserLevel.None);
ConfigurationSection myParamsSection = config.GetSection("MyParams");
string myParamsSectionRawXml = myParamsSection .SectionInformation.GetRawXml();
XmlDocument sectionXmlDoc = new XmlDocument();
sectionXmlDoc.Load(new StringReader(myParamsSectionRawXml ));
NameValueSectionHandler handler = new NameValueSectionHandler();
NameValueCollection handlerCreatedCollection =
handler.Create(null, null, sectionXmlDoc.DocumentElement) as NameValueCollection;
Console.WriteLine(handlerCreatedCollection.Count);
一种适用于任何遗留IConfigurationSectionHandler类型NameValueSectionHandler,DictionarySectionHandler,SingleTagSectionHandler的方法。
A method that works with any of the legacy IConfigurationSectionHandler types NameValueSectionHandler, DictionarySectionHandler, SingleTagSectionHandler.
public static object GetConfigurationValues(string configFileName, string sectionName)
{
ExeConfigurationFileMap configFileMap = new ExeConfigurationFileMap() { ExeConfigFilename = configFileName };
Configuration config = ConfigurationManager.OpenMappedExeConfiguration(configFileMap, ConfigurationUserLevel.None);
ConfigurationSection section = config.GetSection(sectionName);
string xml = section.SectionInformation.GetRawXml();
XmlDocument doc = new XmlDocument();
doc.Load(XmlReader.Create(new StringReader(xml)));
string type = section.SectionInformation.Type;
string assemblyName = typeof(IConfigurationSectionHandler).Assembly.GetName().FullName;
ObjectHandle configSectionHandlerHandle = Activator.CreateInstance(assemblyName, section.SectionInformation.Type);
if (configSectionHandlerHandle != null)
{
IConfigurationSectionHandler handler = configSectionHandlerHandle.Unwrap() as IConfigurationSectionHandler;
return handler.Create(null, null, doc.DocumentElement);
}
return null;
}
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