blocks|key|1463834|text|它可以工作，只需查看bin/Debug文件夹，您可能正在查看项目中的app.config文件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1463835|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

It works, just look at the bin/Debug folder, you are probably looking at app.config file inside project.

blocks|key|1463894|text|您必须手动更新app.config文件|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1463895|//+Load+the+app.config+file
XmlDocument+xml+=+new+XmlDocument();
xml.Load(AppDomain.CurrentDomain.SetupInformation.ConfigurationFile);

//+Do+whatever+you+need,+like+modifying+the+appSettings+section

//+Save+the+new+setting
xml.Save(AppDomain.CurrentDomain.SetupInformation.ConfigurationFile);|code-block|syntax|javascript|1463896|然后告诉您的应用程序重新加载您修改过的任何部分|1463897|ConfigurationManager.RefreshSection("appSettings");|1463898|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|$]]

You have to update your app.config file manually

<pre><code>// Load the app.config file
XmlDocument xml = new XmlDocument();
xml.Load(AppDomain.CurrentDomain.SetupInformation.ConfigurationFile);

// Do whatever you need, like modifying the appSettings section

// Save the new setting
xml.Save(AppDomain.CurrentDomain.SetupInformation.ConfigurationFile);
</code></pre>

And then tell your application to reload any section you modified

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

blocks|key|1249167|text|下面的代码适用于我：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1249168|++++Configuration+config+=+ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);+
++++config.AppSettings.Settings["test"].Value+=+"blah";+++++++
++++config.Save(ConfigurationSaveMode.Modified);
++++ConfigurationManager.RefreshSection("appSettings");|code-block|syntax|javascript|1249169|注意:它不会更新解决方案项'app.config'，但如果您使用F5运行它，则会更新bin/文件夹中的'.exe.config‘项。|1249170|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

This code works for me:

<pre><code> Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None); 
 config.AppSettings.Settings["test"].Value = "blah"; 
 config.Save(ConfigurationSaveMode.Modified);
 ConfigurationManager.RefreshSection("appSettings");
</code></pre>

Note: it doesn't update the solution item 'app.config', but the '.exe.config' one in the bin/ folder if you run it with F5.

blocks|key|1249177|text|尝试：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1249178|Configuration+config+=+ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
config.AppSettings.Settings.Remove("configFilePath");
config.AppSettings.Settings.Add("configFilePath",+configFilePath);
config.Save(ConfigurationSaveMode.Modified,true);
config.SaveAs(@"C:\Users\USERNAME\Documents\Visual+Studio+2010\Projects\ADI2v1.4\ADI2CE2\App.config",ConfigurationSaveMode.Modified,+true);+|code-block|syntax|javascript|1249179|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:

<pre><code>Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
config.AppSettings.Settings.Remove("configFilePath");
config.AppSettings.Settings.Add("configFilePath", configFilePath);
config.Save(ConfigurationSaveMode.Modified,true);
config.SaveAs(@"C:\Users\USERNAME\Documents\Visual Studio 2010\Projects\ADI2v1.4\ADI2CE2\App.config",ConfigurationSaveMode.Modified, true); 
</code></pre>

blocks|key|1463989|text|对Adis+H的示例进行扩展，以包括null情况(在这个示例中得到了比特)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1463990|+Configuration+config+=+ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
++++++++++++if+(config.AppSettings.Settings["HostName"]+!=+null)
++++++++++++++++config.AppSettings.Settings["HostName"].Value+=+hostName;
++++++++++++else++++++++++++++++
++++++++++++++++config.AppSettings.Settings.Add("HostName",+hostName);++++++++++++++++
++++++++++++config.Save(ConfigurationSaveMode.Modified);
++++++++++++ConfigurationManager.RefreshSection("appSettings");|code-block|syntax|javascript|1463991|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|$]]

Expanding on Adis H's example to include the null case (got bit on this one)

<pre><code> Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
 if (config.AppSettings.Settings["HostName"] != null)
 config.AppSettings.Settings["HostName"].Value = hostName;
 else 
 config.AppSettings.Settings.Add("HostName", hostName); 
 config.Save(ConfigurationSaveMode.Modified);
 ConfigurationManager.RefreshSection("appSettings");
</code></pre>

blocks|key|1464002|text|+XmlReaderSettings+_configsettings+=+new+XmlReaderSettings();
+_configsettings.IgnoreComments+=+true;

+XmlReader+_configreader+=+XmlReader.Create(ConfigFilePath,+_configsettings);
+XmlDocument+doc_config+=+new+XmlDocument();
+doc_config.Load(_configreader);
+_configreader.Close();

+foreach+(XmlNode+RootName+in+doc_config.DocumentElement.ChildNodes)
+{
+++++if+(RootName.LocalName+==+"appSettings")
+++++{
+++++++++if+(RootName.HasChildNodes)
+++++++++{
+++++++++++++foreach+(XmlNode+_child+in+RootName.ChildNodes)
+++++++++++++{
+++++++++++++++++if+(_child.Attributes["key"].Value+==+"HostName")
+++++++++++++++++{
+++++++++++++++++++++if+(_child.Attributes["value"].Value+==+"false")
+++++++++++++++++++++++++_child.Attributes["value"].Value+=+"true";
+++++++++++++++++}
+++++++++++++}
+++++++++}
+++++}
+}
+doc_config.Save(ConfigFilePath);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1464003|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code> XmlReaderSettings _configsettings = new XmlReaderSettings();
 _configsettings.IgnoreComments = true;

 XmlReader _configreader = XmlReader.Create(ConfigFilePath, _configsettings);
 XmlDocument doc_config = new XmlDocument();
 doc_config.Load(_configreader);
 _configreader.Close();

 foreach (XmlNode RootName in doc_config.DocumentElement.ChildNodes)
 {
 if (RootName.LocalName == "appSettings")
 {
 if (RootName.HasChildNodes)
 {
 foreach (XmlNode _child in RootName.ChildNodes)
 {
 if (_child.Attributes["key"].Value == "HostName")
 {
 if (_child.Attributes["value"].Value == "false")
 _child.Attributes["value"].Value = "true";
 }
 }
 }
 }
 }
 doc_config.Save(ConfigFilePath);
</code></pre>

I want to modify a value in appSetting section in app.config. So i wrote,

<pre><code>Console.WriteLine(ConfigurationManager.AppSettings["name"]);
Console.Read();
Configuration config=ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None); 
config.AppSettings.Settings["name"].Value = "raja"; 
config.Save(ConfigurationSaveMode.Modified); 
ConfigurationManager.RefreshSection("appSettings");
Console.WriteLine(ConfigurationManager.AppSettings["name"]);
Console.Read();
</code></pre>

after the execution of above code, i verified the app.config whether the value of "name" element has been changed or not. but no change.

what is the wrong with my code? or is there any other way to do this?

Change the value in app.config file dynamically

Visual Studio

我想在app.config的appSetting部分修改一个值。所以我写了，Console.WriteLine(ConfigurationManager.AppSettings["name"]);Console.Read();Configuration config=ConfigurationManager.OpenE...

问动态更改app.config文件中的值
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