如何读取 web.config 文件中的 appSettings 部分？

我的 XML 是这样的，文件名是 web.config

<?xml version="1.0"?>
<configuration>
<appSettings>
<add key="configFile" value="IIS.config"/>
<add key="RialtoDomain" value="ASNC_AUDITORS"/>
</appSettings>
<system.serviceModel>
....
</system.serviceModel>
</configuration>

当我读到这样的代码时

String path = ConfigurationSettings.AppSettings["configFile"];

我得到一个空值。没有抛出异常。 这样做对吗？

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小开 
ConfigurationManager.AppSettings["configFile"]

http://msdn.microsoft.com/en-us/library/system.configuration.configurationmanager.appsettings.aspx

小开

Add namespace

using System.Configuration;

and in place of

ConfigurationSettings.AppSettings

you should use

ConfigurationManager.AppSettings

String path = ConfigurationManager.AppSettings["configFile"];
小开
最佳答案

Since you're accessing a web.config you should probably use 

using System.Web.Configuration;


WebConfigurationManager.AppSettings["configFile"]
小开

You should add System.configuration dll as reference and use System.Configuration.ConfigurationManager.AppSettings["configFile"].ToString

Don't forget to add usingstatement at the beginning. Hope it will help.

小开 
    using System.Configuration;


/// <summary>
/// For read one setting
/// </summary>
/// <param name="key">Key correspondent a your setting</param>
/// <returns>Return the String contains the value to setting</returns>
public string ReadSetting(string key)
{
var appSettings = ConfigurationManager.AppSettings;
return appSettings[key] ?? string.Empty;
}


/// <summary>
/// Read all settings for output Dictionary<string,string>
/// </summary>
/// <returns>Return the Dictionary<string,string> contains all settings</returns>
public Dictionary<string, string> ReadAllSettings()
{
var result = new Dictionary<string, string>();
foreach (var key in ConfigurationManager.AppSettings.AllKeys)
result.Add(key, ConfigurationManager.AppSettings[key]);
return result;
}
小开

Here's the easy way to get access to the web.config settings anywhere in your C# project.

 Properties.Settings.Default

Use case:

litBodyText.Text = Properties.Settings.Default.BodyText;
litFootText.Text = Properties.Settings.Default.FooterText;
litHeadText.Text = Properties.Settings.Default.HeaderText;

Web.config file:

  <applicationSettings>
<myWebSite.Properties.Settings>
<setting name="BodyText" serializeAs="String">
<value>
&lt;h1&gt;Hello World&lt;/h1&gt;
&lt;p&gt;
Ipsum Lorem
&lt;/p&gt;
</value>
</setting>
<setting name="HeaderText" serializeAs="String">
My header text
<value />
</setting>
<setting name="FooterText" serializeAs="String">
My footer text
<value />
</setting>
</myWebSite.Properties.Settings>
</applicationSettings>

No need for special routines - everything is right there already. I'm surprised that no one has this answer for the best way to read settings from your web.config file.


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