问题
I'm developing a C# WPF MVVM application with .NET Framework 4.6.1 and I have a custom section in App.config:
<configuration>
<configSections>
<section name="SpeedSection" type="System.Configuration.NameValueSectionHandler" />
</configSections>
<SpeedSection>
<add key="PrinterSpeed" value="150" />
<add key="CameraSpeed" value="150" />
</SpeedSection>
</configuration>
I want to modify PrinterSpeed
and CameraSpeed
from my app. I have tried this code:
static void AddUpdateAppSettings(string key, string value)
{
try
{
var configFile = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
var settings = configFile.AppSettings.Settings;
if (settings[key] == null)
{
settings.Add(key, value);
}
else
{
settings[key].Value = value;
}
configFile.Save(ConfigurationSaveMode.Modified);
ConfigurationManager.RefreshSection(configFile.AppSettings.SectionInformation.Name);
}
catch (ConfigurationErrorsException)
{
Console.WriteLine("Error writing app settings");
}
}
But it doesn't work because I'm not modifying AppSettings
section.
How can I modify those values?
回答1:
System.Configuration.NameValueSectionHandler
is hard to work with. You can replace it with System.Configuration.AppSettingsSection
without touching anything else:
<configuration>
<configSections>
<section name="SpeedSection" type="System.Configuration.AppSettingsSection" />
</configSections>
<SpeedSection>
<add key="PrinterSpeed" value="150" />
<add key="CameraSpeed" value="150" />
</SpeedSection>
</configuration>
And then change your method as follows:
static void AddUpdateAppSettings(string key, string value)
{
try
{
var configFile = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
var settings = ((AppSettingsSection) configFile.GetSection("SpeedSection")).Settings;
if (settings[key] == null)
{
settings.Add(key, value);
}
else
{
settings[key].Value = value;
}
configFile.Save(ConfigurationSaveMode.Modified);
ConfigurationManager.RefreshSection(configFile.AppSettings.SectionInformation.Name);
}
catch (ConfigurationErrorsException)
{
Console.WriteLine("Error writing app settings");
}
}
回答2:
You should use ConfigurationSection class. This tutorial could help: https://msdn.microsoft.com/en-us/library/2tw134k3.aspx
来源:https://stackoverflow.com/questions/40737395/modify-custom-app-config-config-section-and-save-it