在C＃中读取自定义配置部分的键值 [英] Reading custom configuration section's key values in C#

问题描述

我需要从app / web.config中的自定义部分读取键值。

I need to read key values from custom sections in app/web.config.

我经历了

使用ConfigurationManager从Web.Config读取密钥

和

How can I retrieve list of custom configuration sections in the .config file using C#?

但是，当我们需要显式指定配置文件的路径时，它们没有指定如何读取自定义节（在我的情况下，配置文件不在这是默认位置）

However, they do not specify how to read a custom section when we need to explicitly specify the path to the configuration file (in my case, the configuration file is not in it's default location)

我的web.config文件示例：

Example of my web.config file:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <MyCustomTag> 
    <add key="key1" value="value1" />
    <add key="key2" value="value2" />
  </MyCustomTag>
<system.web>
  <compilation related data />
 </system.web> 
</configuration>

其中，我需要读取MyCustomTag内部的键值对。

in which i need to read key value pairs inside MyCustomTag.

当我尝试（configFilePath是我的配置文件的路径）时：-

When i try (configFilePath is the path to my configuration file):-

var configFileMap = new ExeConfigurationFileMap { ExeConfigFilename = configFilePath };

var config =
          ConfigurationManager.OpenMappedExeConfiguration(
            configFileMap, ConfigurationUserLevel.None);

        ConfigurationSection section = config.GetSection(sectionName);

        return section[keyName].Value;

我在[keyName]部分收到一条错误消息，指出无法在此处访问受保护的内部索引器'this'

I get a error stating "Cannot access protected internal indexer 'this' here" at section[keyName]

推荐答案

不幸的是，这并不像听起来那样简单。解决该问题的方法是使用 ConfigurationManager 获取文件配置文件，然后使用原始xml。因此，我通常使用以下方法：

Unfortunately, this is not as easy as it sounds. The way to solve the problem is to get file config file with ConfigurationManager and then work with the raw xml. So, I normally use the following method:

private NameValueCollection GetNameValueCollectionSection(string section, string filePath)
{
        string file = filePath;
        System.Xml.XmlDocument xDoc = new System.Xml.XmlDocument();
        NameValueCollection nameValueColl = new NameValueCollection();

        System.Configuration.ExeConfigurationFileMap map = new ExeConfigurationFileMap();
        map.ExeConfigFilename = file;
        Configuration config = ConfigurationManager.OpenMappedExeConfiguration(map, ConfigurationUserLevel.None);
        string xml = config.GetSection(section).SectionInformation.GetRawXml();
        xDoc.LoadXml(xml);

        System.Xml.XmlNode xList = xDoc.ChildNodes[0];
        foreach (System.Xml.XmlNode xNodo in xList)
        {
            nameValueColl.Add(xNodo.Attributes[0].Value, xNodo.Attributes[1].Value);

        }

        return nameValueColl;
 }

该方法的调用：

 var bla = GetNameValueCollectionSection("MyCustomTag", @".\XMLFile1.xml");


for (int i = 0; i < bla.Count; i++)
{
    Console.WriteLine(bla[i] + " = " + bla.Keys[i]);
}

结果：

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