Can't read appSettings value from Web.Config

问题

I have the following in my web.config:

<configuration>
    <appSettings>
        <add key="PsychMon" value="true"/>
    </appSettings>
 . . .
</configuration>

I have the following code in my codebehind:

  System.Configuration.Configuration webConfig = 
System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration(null) ; 

However, when I look at webConfig, webConfig.AppSettings.Settings.Count = 0 .

Why is it not reading the app setting?

What I want to do is be able to get the setting by using:

          System.Configuration.KeyValueConfigurationElement psych = 
webConfig.AppSettings.Settings["PsychMon"];

I am using c# 3.5, vs 2008

回答1:

Why don't you just write this ?

string value = 
    System.Web.Configuration.WebConfigurationManager.AppSettings["PsychMon"];

回答2:

try this :

ConfigurationManager.AppSettings["PsychMon"];

or ( for global)

 Configuration webConfig = WebConfigurationManager.OpenWebConfiguration(Request.ApplicationPath);

回答3:

Instead of creating the webConfig variable, why not just use ConfigurationManager.AppSettings["PsychMon"]

来源：https://stackoverflow.com/questions/11651005/cant-read-appsettings-value-from-web-config