blocks|key|971766|text|也许您应该考虑添加一个设置文件。(例如App.Settings)创建此文件将允许您执行以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|971767|string+mysetting+=+App.Default.MySetting;
App.Default.MySetting+=+"my+new+setting";|code-block|syntax|javascript|971768|这意味着您可以编辑项目，然后更改项目，其中项目是强类型的，最重要的是...在部署之前，您不必接触任何xml！|971769|结果是应用程序或用户上下文设置。|971770|查看设置文件的"add+new+item“菜单。|971771|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Perhaps you should look at adding a Settings File. (e.g. App.Settings)
Creating this file will allow you to do the following:

<pre><code>string mysetting = App.Default.MySetting;
App.Default.MySetting = "my new setting";
</code></pre>

This means you can edit and then change items, where the items are strongly typed, and best of all... you don't have to touch any xml before you deploy! 

The result is a Application or User contextual setting.

Have a look in the "add new item" menu for the setting file.

blocks|key|971871|text|试着在你的save调用之后添加这个。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|971872|ConfigurationManager.RefreshSection(+"appSettings"+);|code-block|syntax|javascript|971873|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try adding this after your save call.

<pre><code>ConfigurationManager.RefreshSection( "appSettings" );
</code></pre>

blocks|key|756307|text|有关如何更改app.config文件中appSettings节中的值的信息：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|756308|config.AppSettings.Settings.Remove(key);
config.AppSettings.Settings.Add(key,+value);|code-block|syntax|javascript|756309|就能完成这项工作。|756310|当然，更好的做法是使用Settings类，但这取决于你想要什么。|756311|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

On how to change values in appSettings section in your app.config file:

<pre><code>config.AppSettings.Settings.Remove(key);
config.AppSettings.Settings.Add(key, value);
</code></pre>

does the job.

Of course better practice is Settings class but it depends on what are you after.

blocks|key|756419|text|首选<appSettings>而不是<customUserSetting>部分。使用(网络)ConfigurationManager读写要容易得多。ConfigurationSection、ConfigurationElement和ConfigurationElementCollection要求您派生自定义类并实现自定义ConfigurationProperty属性。对于普通的普通人来说，这实在是太多了。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|756420|下面是一个读写web.config的示例：|756421|using+System.Web.Configuration;
using+System.Configuration;

Configuration+config+=+WebConfigurationManager.OpenWebConfiguration("/");
string+oldValue+=+config.AppSettings.Settings["SomeKey"].Value;
config.AppSettings.Settings["SomeKey"].Value+=+"NewValue";
config.Save(ConfigurationSaveMode.Modified);|code-block|syntax|javascript|756422|之前：|756423|<appSettings>
++<add+key="SomeKey"+value="oldValue"+/>
</appSettings>|756424|之后：|756425|<appSettings>
++<add+key="SomeKey"+value="newValue"+/>
</appSettings>|756426|entityMap^0|2|D|I|J|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]|$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|11|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|12|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|13|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|14|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|15|8|@]|D|@]|E|$]]|$1|S|3|T|5|J|7|16|8|@]|D|@]|E|$K|L]]|$1|U|3|-4|5|6|7|17|8|@]|D|@]|E|$]]]|V|$]]

Prefer <code>&lt;appSettings&gt;</code> to <code>&lt;customUserSetting&gt;</code> section. It is much easier to read AND write with (Web)ConfigurationManager. ConfigurationSection, ConfigurationElement and ConfigurationElementCollection require you to derive custom classes and implement custom ConfigurationProperty properties. Way too much for mere everyday mortals IMO.

Here is an example of reading and writing to web.config:

<pre><code>using System.Web.Configuration;
using System.Configuration;

Configuration config = WebConfigurationManager.OpenWebConfiguration("/");
string oldValue = config.AppSettings.Settings["SomeKey"].Value;
config.AppSettings.Settings["SomeKey"].Value = "NewValue";
config.Save(ConfigurationSaveMode.Modified);
</code></pre>

Before:

<pre class="lang-xml prettyprint-override"><code>&lt;appSettings&gt;
 &lt;add key="SomeKey" value="oldValue" /&gt;
&lt;/appSettings&gt;
</code></pre>

After:

<pre class="lang-xml prettyprint-override"><code>&lt;appSettings&gt;
 &lt;add key="SomeKey" value="newValue" /&gt;
&lt;/appSettings&gt;
</code></pre>

blocks|key|971995|text|请记住，ConfigurationManager只使用一个app.config+-启动项目中的一个。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|971996|如果你将一些app.config放到一个解决方案A中，并从另一个解决方案B中引用它，那么如果你运行B，那么来自A的app.config将被忽略。|971997|例如，单元测试项目应该有自己的app.config。|971998|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

Remember that ConfigurationManager uses only one app.config - one that is in startup project.

If you put some app.config to a solution A and make a reference to it from another solution B then if you run B, app.config from A will be ignored.

So for example unit test project should have their own app.config.

blocks|key|756476|text|由于基本问题是关于win表单的，下面是解决方案：(我刚刚用user1032413修改了代码以反映windowsForms设置)，如果它是一个新的密钥：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|756477|Configuration+config+=+configurationManager.OpenExeConfiguration(Application.ExecutablePath);+
config.AppSettings.Settings.Add("Key","Value");
config.Save(ConfigurationSaveMode.Modified);|code-block|syntax|javascript|756478|如果密钥已经存在：|756479|Configuration+config+=+ConfigurationManager.OpenExeConfiguration(Application.ExecutablePath);+
config.AppSettings.Settings["Key"].Value="Value";
config.Save(ConfigurationSaveMode.Modified);|756480|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

as the base question is about win forms here is the solution :
( I just changed the code by user1032413 to rflect windowsForms settings )
if it's a new key :

<pre><code>Configuration config = configurationManager.OpenExeConfiguration(Application.ExecutablePath); 
config.AppSettings.Settings.Add("Key","Value");
config.Save(ConfigurationSaveMode.Modified);
</code></pre>

if the key already exists :

<pre><code>Configuration config = ConfigurationManager.OpenExeConfiguration(Application.ExecutablePath); 
config.AppSettings.Settings["Key"].Value="Value";
config.Save(ConfigurationSaveMode.Modified);
</code></pre>

blocks|key|972075|text|我知道我迟到了:)但我是这样做的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|972076|public+static+void+AddOrUpdateAppSettings(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");
++++}
}|code-block|syntax|javascript|972077|有关更多信息，请查看MSDN|offset|length|972078|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.configuration.configurationmanager.appsettings(v=vs.110).aspx^0|0|0|A|4|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

I know I'm late :) But this how i do it:

<pre><code>public static void AddOrUpdateAppSettings(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");
 }
}
</code></pre>

For more information look at <a href="http://msdn.microsoft.com/en-us/library/system.configuration.configurationmanager.appsettings(v=vs.110).aspx">MSDN</a>

blocks|key|756582|text|我认为问题在于，在调试visual+studio中，不要使用普通的exeName。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|756583|它使用indtead+"NameApplication".host.exe|756584|因此，配置文件的名称是"NameApplication".host.exe.config，而不是"NameApplication".exe.config|756585|并在应用程序关闭后返回到back+app.config|756586|因此，如果您检查了错误的文件或错误的时间，您将看到没有任何更改。|756587|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|N|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|O|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

I think the problem is that in the debug visual studio don't use the normal exeName.

it use indtead "NameApplication".host.exe

so the name of the config file is "NameApplication".host.exe.config and not
"NameApplication".exe.config

and after the application close - it return to the back app.config

so if you check the wrong file or you check on the wrong time you will see that nothing changed.

blocks|key|756628|text|您可以手动更改它：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|756629|private+void+UpdateConfigFile(string+appConfigPath,+string+key,+string+value)
{
+++++var+appConfigContent+=+File.ReadAllText(appConfigPath);
+++++var+searchedString+=+$"<add+key=\"{key}\"+value=\"";
+++++var+index+=+appConfigContent.IndexOf(searchedString)+%2B+searchedString.Length;
+++++var+currentValue+=+appConfigContent.Substring(index,+appConfigContent.IndexOf("\"",+index)+-+index);
+++++var+newContent+=+appConfigContent.Replace($"{searchedString}{currentValue}\"",+$"{searchedString}{newValue}\"");
+++++File.WriteAllText(appConfigPath,+newContent);
}|code-block|syntax|javascript|756630|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can change it manually:

<pre><code>private void UpdateConfigFile(string appConfigPath, string key, string value)
{
 var appConfigContent = File.ReadAllText(appConfigPath);
 var searchedString = $"&lt;add key=\"{key}\" value=\"";
 var index = appConfigContent.IndexOf(searchedString) + searchedString.Length;
 var currentValue = appConfigContent.Substring(index, appConfigContent.IndexOf("\"", index) - index);
 var newContent = appConfigContent.Replace($"{searchedString}{currentValue}\"", $"{searchedString}{newValue}\"");
 File.WriteAllText(appConfigPath, newContent);
}
</code></pre>

It might sound too trival to ask and I do the same thing as suggested in articles, yet it doesn't work as expected. Hope someone can point me to the right direction.

I would like to save the usersettings per AppSettings.

Once the Winform is closed I trigger this:

<pre><code>conf.Configuration config = 
 ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);

if (ConfigurationManager.AppSettings["IntegrateWithPerforce"] != null)
 ConfigurationManager.AppSettings["IntegrateWithPerforce"] = 
 e.Payload.IntegrateCheckBox.ToString();
else
 config.AppSettings.Settings.Add("IntegrateWithPerforce", 
 e.Payload.IntegrateCheckBox.ToString());

config.Save(ConfigurationSaveMode.Modified);
</code></pre>

So the first time when the entry doesnt exist yet, it would simply create it, otherwise it would modify the existing entry. However this doesn't save.

1) What am I doing wrong?

2) Where am I expecting the usersettings for App settings to be saved again? Is it in the Debug folder or in C:\Documents and Settings\USERNAME\Local Settings\Application Data folder?

ConfigurationManager.AppSettings - How to modify and save?

单元测试

这听起来可能太琐碎了，我按照文章中的建议做了同样的事情，但它并没有像预期的那样工作。希望有人能给我指引正确的方向。我想保存每个AppSettings的用户设置。一旦Winform关闭，我将触发此操作：conf.Configuration config =            ConfigurationManager....

问ConfigurationManager.AppSettings -如何修改和保存？
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