blocks|key|1588826|text|更改web.config通常会导致应用程序重新启动。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1588827|如果您确实需要您的应用程序编辑它自己的设置，那么您应该考虑一种不同的方法，比如将这些设置存储到数据库中，或者创建一个包含可编辑设置的xml文件。|1588828|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Changing the web.config generally causes an application restart.

If you really need your application to edit its own settings, then you should consider a different approach such as databasing the settings or creating an xml file with the editable settings.

blocks|key|1588887|text|您需要使用WebConfigurationManager.OpenWebConfiguration()：例如：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1588888|Dim+myConfiguration+As+Configuration+=+System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration("~")
myConfiguration.ConnectionStrings.ConnectionStrings("myDatabaseName").ConnectionString+=+txtConnectionString.Text
myConfiguration.AppSettings.Settings.Item("myKey").Value+=+txtmyKey.Text
myConfiguration.Save()|code-block|syntax|javascript|1588889|我认为您可能还需要在machine.config中设置AllowLocation。这是一个布尔值，指示是否可以使用元素配置单个页面。如果"allowLocation“为false，则无法在单个元素中进行配置。|1588890|最后，如果您在IIS中运行应用程序，并从Visual+Studio中运行测试示例，情况会有所不同。ASP.NET进程标识是IIS帐户、ASPNET或网络服务(取决于IIS版本)。|1588891|可能需要授予ASP.NET或网络服务对web.config所在文件夹的“修改”访问权限。|1588892|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.configuration.sectioninformation.allowlocation(VS.80).aspx^0|5|1A|0|0|R|D|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|12|8|@]|D|@$9|13|A|14|1|15]]|E|$]]|$1|M|3|N|5|6|7|16|8|@]|D|@]|E|$]]|$1|O|3|P|5|6|7|17|8|@]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|18|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|X]]]]

You need to use <code>WebConfigurationManager.OpenWebConfiguration()</code>:
For Example:

<pre><code>Dim myConfiguration As Configuration = System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration("~")
myConfiguration.ConnectionStrings.ConnectionStrings("myDatabaseName").ConnectionString = txtConnectionString.Text
myConfiguration.AppSettings.Settings.Item("myKey").Value = txtmyKey.Text
myConfiguration.Save()
</code></pre>

I think you might also need to set <a href="http://msdn.microsoft.com/en-us/library/system.configuration.sectioninformation.allowlocation(VS.80).aspx" rel="noreferrer">AllowLocation</a> in machine.config. This is a boolean value that indicates whether individual pages can be configured using the element. If the "allowLocation" is false, it cannot be configured in individual elements. 

Finally, it makes a difference if you run your application in IIS and run your test sample from Visual Studio. The ASP.NET process identity is the IIS account, ASPNET or NETWORK SERVICES (depending on IIS version).

Might need to grant ASPNET or NETWORK SERVICES Modify access on the folder where web.config resides.

blocks|key|1373860|text|如果你想避免重启应用程序，你可以移出appSettings部分：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1373861|<appSettings+configSource="Config\appSettings.config"/>|code-block|syntax|javascript|1373862|添加到单独的文件中。与ConfigurationSaveMode.Minimal结合使用|1373863|var+config+=+System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration("~");
config.Save(ConfigurationSaveMode.Minimal);|1373864|您可以继续使用appSettings节作为各种设置的存储区，而不会导致应用程序重新启动，也不需要使用与普通appSettings节不同格式的文件。|1373865|entityMap^0|I|B|0|0|B|T|0|0|7|B|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|13|8|@]|D|@]|E|$]]]|R|$]]

And if you want to avoid the restart of the application, you can move out the <code>appSettings</code> section:

<pre><code>&lt;appSettings configSource="Config\appSettings.config"/&gt;
</code></pre>

to a separate file. And in combination with <code>ConfigurationSaveMode.Minimal</code>

<pre><code>var config = System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration("~");
config.Save(ConfigurationSaveMode.Minimal);
</code></pre>

you can continue to use the <code>appSettings</code> section as the store for various settings without causing application restarts and without the need to use a file with a different format than the normal appSettings section.

blocks|key|1588972|text|喜欢直截了当的人，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1588973|在配置中|1588974|++++<appSettings>

++++<add+key="Conf_id"+value="71"+/>

++</appSettings>|code-block|syntax|javascript|1588975|在你的代码中(c#)|1588976|///SET
++++ConfigurationManager.AppSettings.Set("Conf_id",+"whateveryourvalue");
++++++///GET++++++++++++++
++++string+conf+=+ConfigurationManager.AppSettings.Get("Conf_id").ToString();|1588977|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Who likes directly to the point,

In your Config

<pre><code> &lt;appSettings&gt;

 &lt;add key="Conf_id" value="71" /&gt;

 &lt;/appSettings&gt;
</code></pre>

in your code(c#)

<pre><code>///SET
 ConfigurationManager.AppSettings.Set("Conf_id", "whateveryourvalue");
 ///GET 
 string conf = ConfigurationManager.AppSettings.Get("Conf_id").ToString();
</code></pre>

blocks|key|1373918|text|试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1373919|using+System;
using+System.Configuration;
using+System.Web.Configuration;

namespace+SampleApplication.WebConfig
{
++++public+partial+class+webConfigFile+:+System.Web.UI.Page
++++{
++++++++protected+void+Page_Load(object+sender,+EventArgs+e)
++++++++{
++++++++++++//Helps+to+open+the+Root+level+web.config+file.
++++++++++++Configuration+webConfigApp+=+WebConfigurationManager.OpenWebConfiguration("~");
++++++++++++//Modifying+the+AppKey+from+AppValue+to+AppValue1
++++++++++++webConfigApp.AppSettings.Settings["ConnectionString"].Value+=+"ConnectionString";
++++++++++++//Save+the+Modified+settings+of+AppSettings.
++++++++++++webConfigApp.Save();
++++++++}
++++}
}|code-block|syntax|javascript|1373920|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 This:

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

namespace SampleApplication.WebConfig
{
 public partial class webConfigFile : System.Web.UI.Page
 {
 protected void Page_Load(object sender, EventArgs e)
 {
 //Helps to open the Root level web.config file.
 Configuration webConfigApp = WebConfigurationManager.OpenWebConfiguration("~");
 //Modifying the AppKey from AppValue to AppValue1
 webConfigApp.AppSettings.Settings["ConnectionString"].Value = "ConnectionString";
 //Save the Modified settings of AppSettings.
 webConfigApp.Save();
 }
 }
}
</code></pre>

I am confused on how to modify the web.config appSettings values at runtime. For example, I have this appSettings section:

<pre><code>&lt;appSettings&gt;
 &lt;add key="productspagedesc" value="TODO: Edit this default message" /&gt;
 &lt;add key="servicespagedesc" value="TODO: Edit this default message" /&gt;
 &lt;add key="contactspagedesc" value="TODO: Edit this default message" /&gt;
 &lt;add key="aboutpagedesc" value="TODO: Edit this default message" /&gt;
 &lt;add key="homepagedesc" value="TODO: Edit this default message" /&gt;
 &lt;/appSettings&gt;
</code></pre>

Let's say, I want to modify the "homepagedesc" key at runtime. I tried ConfigurationManager and WebConfigurationManager static classes, but the settings are "read-only". How do I modify appSettings values at runtime?

UPDATE:
Ok, so here I am 5 years later. I would like to point out that experience has told me, we should not put any configuration that intentionally is editable at runtime in the web.config file but instead we should put it in a separate XML file as what one of the users commented below. This will not require any of edit of web.config file to restart the App which will result with angry users calling you.

How do you modify the web.config appSettings at runtime?

Visual Studio

数据库

我对如何在运行时修改web.config appSettings值感到困惑。例如，我有一个appSettings部分：<appSettings> <add key="productspagedesc" value="TODO: Edit this default message" /> <add key="serv...

问如何在运行时修改web.config appSettings？
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问如何在运行时修改web.config appSettings？
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