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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?

user-settings configuration-files persistence .net

Pat · 技术社区 · 15 年前

有一些问题与 reading settings from a separate config file 以及其他类似的问题,但我的问题是特定于应用程序属性设置(即 <MyApplication.Properties.Settings> -请参见下面的XML文件)以及如何动态加载它们。我试过这个方法 this post ,这涉及刷新主配置文件的整个appsettings部分,但由于我没有替换appsettings部分,因此我的改编引发了异常:

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");

configurationErrorException.message为“根元素必须与引用文件“appSettings”(C:\myfile.xml第2行)的节的名称匹配”。该文件为:

<?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>

是否有方法将此文件中的值导入到 MyApplication.Properties.Settings.Default 类,框架像在应用程序启动时加载配置文件一样处理所有XML反序列化?

2 回复 | 直到 15 年前

Pat 15 年前

好吧,这是可行的:

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);
    }
}

export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>

import方法解析该文件,获取节点内的所有内容,将该XML放入相应部分的user.config文件中,然后重新加载properties.settings.default,以便从新的user.config文件中获取这些值。

Martijn Pieters 12 年前

PAT建议的解决方案:

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

收益率 null . 我把它改成

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

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

而且效果很好。