有没有办法在运行时从默认文件以外的其他文件加载设置App.config
?我想在加载默认配置文件后执行此操作。
我使用Settings.Settings
Visual Studio 中的 GUIApp.config
为我创建文件。配置文件最终看起来像这样:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<sectionGroup name="applicationSettings" type="System.Configuration.ApplicationSettingsGroup, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" >
<section name="SnipetTester.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</sectionGroup>
</configSections>
<applicationSettings>
<SnipetTester.Properties.Settings>
<setting name="SettingSomething" serializeAs="String">
<value>1234</value>
</setting>
</SnipetTester.Properties.Settings>
</applicationSettings>
</configuration>
在代码中,我可以访问这样的设置:
Console.WriteLine("Default setting value: " + Properties.Settings.Default.SettingSomething);
这个想法是,当应用程序运行时,我应该能够在运行时指定一个配置文件,并让应用程序将配置文件加载到Properties.Settings.Default
对象中,而不是使用默认app.config
文件。配置文件的格式相同,但设置的值会不同。
我知道用ConfigurationManager.OpenExeConfiguration(configFile);
. 但是,在我运行的测试中,它不会更新Properties.Settings.Default
对象以反映配置文件中的新值。
在考虑了一段时间之后,我已经能够提出一个我更喜欢的解决方案。我确信它有一些陷阱,但我认为它会为我需要它做的事情工作。
本质上,Properties.Settings
该类是由 Visual Studio 自动生成的;它为您生成类的代码。我能够找到代码的生成位置并添加一些函数调用来自行加载配置文件。这是我的补充:
internal sealed partial class Settings : global::System.Configuration.ApplicationSettingsBase
{
//Parses a config file and loads its settings
public void Load(string filename)
{
System.Xml.Linq.XElement xml = null;
try
{
string text = System.IO.File.ReadAllText(filename);
xml = System.Xml.Linq.XElement.Parse(text);
}
catch
{
//Pokemon catch statement (gotta catch 'em all)
//If some exception occurs while loading the file,
//assume either the file was unable to be read or
//the config file is not in the right format.
//The xml variable will be null and none of the
//settings will be loaded.
}
if(xml != null)
{
foreach(System.Xml.Linq.XElement currentElement in xml.Elements())
{
switch (currentElement.Name.LocalName)
{
case "userSettings":
case "applicationSettings":
foreach (System.Xml.Linq.XElement settingNamespace in currentElement.Elements())
{
if (settingNamespace.Name.LocalName == "SnipetTester.Properties.Settings")
{
foreach (System.Xml.Linq.XElement setting in settingNamespace.Elements())
{
LoadSetting(setting);
}
}
}
break;
default:
break;
}
}
}
}
//Loads a setting based on it's xml representation in the config file
private void LoadSetting(System.Xml.Linq.XElement setting)
{
string name = null, type = null, value = null;
if (setting.Name.LocalName == "setting")
{
System.Xml.Linq.XAttribute xName = setting.Attribute("name");
if (xName != null)
{
name = xName.Value;
}
System.Xml.Linq.XAttribute xSerialize = setting.Attribute("serializeAs");
if (xSerialize != null)
{
type = xSerialize.Value;
}
System.Xml.Linq.XElement xValue = setting.Element("value");
if (xValue != null)
{
value = xValue.Value;
}
}
if (string.IsNullOrEmpty(name) == false &&
string.IsNullOrEmpty(type) == false &&
string.IsNullOrEmpty(value) == false)
{
switch (name)
{
//One of the pitfalls is that everytime you add a new
//setting to the config file, you will need to add another
//case to the switch statement.
case "SettingSomething":
this[name] = value;
break;
default:
break;
}
}
}
}
我添加的代码公开了一个Properties.Settings.Load(string filename)
函数。该函数接受配置文件名作为参数。它将解析文件并加载它在配置文件中遇到的任何设置。要恢复到原始配置,只需调用Properties.Settings.Reload()
.
希望这可以帮助别人!