如何动态加载单独的应用程序设置文件并与当前设置合并？

Question

存在与 从单独的配置文件读取设置和其他类似问题有关的问题，但我的问题特定于应用程序属性设置（即

<MyApplication.Properties.Settings>

- 请参阅下面的 XML 文件）以及如何动态加载它们。我尝试了这篇文章中的方法，其中涉及刷新主配置文件的整个appSettings部分，但我的改编引发了异常，因为我没有替换appSettings部分：

var config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.PerUserRoamingAndLocal);
// Have tried the other ConfigurationUserLevels to no avail
config.AppSettings.File = myRuntimeConfigFilePath;
config.Save(ConfigurationSaveMode.Modified); // throws ConfigurationErrorsException
ConfigurationManager.RefreshSection("userSettings");

ConfigurationErrorsException.Message 是“根元素必须与引用文件‘appSettings’的部分的名称匹配（C:\myFile.xml 第 2 行）。”该文件是：

<?xml version="1.0" encoding="utf-8"?>
<configuration>
    <userSettings>
        <MyApplication.Properties.Settings>
            <setting name="SineWaveFrequency" serializeAs="String">
                <value>6</value>
            </setting>
            <setting name="SineWaveAmplitude" serializeAs="String">
                <value>6</value>
            </setting>
        </MyApplication.Properties.Settings>
    </userSettings>
</configuration>

有没有办法将此文件中的值导入到

MyApplication.Properties.Settings.Default

类中，并让框架处理所有 XML 反序列化，就像在应用程序启动时加载配置文件时那样？

Answer 1

嗯，这有效：

using System;
using System.Configuration;
using System.IO;
using System.Linq;
using System.Xml.Linq;
using System.Xml.XPath;

public static class SettingsIO
{
    internal static void Import(string settingsFilePath)
    {
        if (!File.Exists(settingsFilePath))
        {
            throw new FileNotFoundException();
        }

        var appSettings = Properties.Settings.Default;
        try
        {
            var config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.PerUserRoamingAndLocal);

            string appSettingsXmlName = Properties.Settings.Default.Context["GroupName"].ToString(); // returns "MyApplication.Properties.Settings";

            // Open settings file as XML
            var import = XDocument.Load(settingsFilePath);
            
            // Get the whole XML inside the settings node
            var settings = import.XPathSelectElements("//" + appSettingsXmlName);

            config.GetSectionGroup("userSettings")
                .Sections[appSettingsXmlName]
                .SectionInformation
                .SetRawXml(settings.Single().ToString());
                
            config.Save(ConfigurationSaveMode.Modified);
            ConfigurationManager.RefreshSection("userSettings");

            appSettings.Reload();
        }
        catch (Exception) // Should make this more specific
        {
            // Could not import settings.
            appSettings.Reload(); // from last set saved, not defaults
        }
    }

    internal static void Export(string settingsFilePath)
    {
        Properties.Settings.Default.Save();
        var config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.PerUserRoamingAndLocal);
        config.SaveAs(settingsFilePath);
    }
}

导出方法创建如下文件：

<?xml version="1.0" encoding="utf-8"?>
<configuration>
    <userSettings>
        <MyApplication.Properties.Settings>
            <setting name="SineWaveFrequency" serializeAs="String">
                <value>1</value>
            </setting>
            <setting name="SineWaveAmplitude" serializeAs="String">
                <value>100</value>
            </setting>
            <setting name="AdcShift" serializeAs="String">
                <value>8</value>
            </setting>
            <setting name="ControlBitsCheckedIndices" serializeAs="String">
                <value>0,1,2,3,5,6,7,8</value>
            </setting>
            <setting name="UpgradeSettings" serializeAs="String">
                <value>False</value>
            </setting>
        </MyApplication.Properties.Settings>
    </userSettings>
</configuration>

导入方法解析该文件，获取 节点内的所有内容，将该 XML 放入 user.config 文件的适当部分，然后重新加载 Properties.Settings.Default 以从新的 user.config 中获取这些值文件。

Answer 2

Pat建议的解决方案：

// Get the whole XML inside the settings node
var settings = import.XPathSelectElements("//" + appSettingsXmlName);

返回

null

。我把它改成了

var settings = import.Element("configuration").Element("userSettings").Element(appSettingsXmlName);

config.GetSectionGroup("userSettings")
      .Sections[appSettingsXmlName]
      .SectionInformation
      .SetRawXml(settings.ToString());

而且效果非常好。