无法使用WebConfigurationManager.AppSettings检索值

Question

我在c#中和mvc3一起使用mvc3。我有一个Web.Config设置。

我需要检索<add key="sitelocalization" value="en-GB" />的值。

使用下面的代码，我将收到以下错误：

String reference not set to an instance of a String.
Parameter name: name

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.ArgumentNullException: String reference not set to an instance of a String.
Parameter name: name

在这一行中，Thread.CurrentThread.CurrentUICulture =新CultureInfo(本地化)；

<appSettings>
    <add key="webpages:Enabled" value="false" />
    <add key="sitelocalization" value="en-GB" />
</appSettings>


        string localization = WebConfigurationManager.AppSettings["sitelocalization"];
        Thread.CurrentThread.CurrentUICulture = new CultureInfo(localization);
        Thread.CurrentThread.CurrentCulture = new CultureInfo(localization);

Answer 1

尝试使用System.Configuration.ConfigurationManager.AppSettings"sitelocalization“

Answer 2

System.Configuration.Configuration rootWebConfig1 =
                System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration(null);
            if (rootWebConfig1.AppSettings.Settings.Count > 0)
            {
                System.Configuration.KeyValueConfigurationElement customSetting = 
                    rootWebConfig1.AppSettings.Settings["customsetting1"];
                if (customSetting != null)
                    Console.WriteLine("customsetting1 application string = \"{0}\"", 
                        customSetting.Value);
                else
                    Console.WriteLine("No customsetting1 application string");
            }




<appSettings>
  <add key="customsetting1" value="Some text here"/>
</appSettings>