silverlight 实现读取app.config 或 web.config

无意中写一个silverlight程序，准备做成浏览器外运行模式。就想如果是浏览器外运行模式，它就是个实实在在的C/S程序了应该和以前的WinForm应用程序一样，能读取本地系统文件。然后就开始google之旅，

此方法有很大局限性，使用慎用。其原理从应用程序包里读取资源文件。

原文章地址http://andrewtokeley.net/archive/2011/01/23/silverlight-4-ndash-simple-configuration-manager.aspx

主要有几点要点，

APP.config 文件通过添加XML文件改XML后缀名实现。

其内部代码如下：

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<appSettings>
<add key="test" value="123456llll"/>
</appSettings>
</configuration>

APP.CONFIG 必须把生成文件选项设置为 Resource 模式。否则会读取不到资源文件。

silverlight 实现读取app.config 或 web.config

ConfigurationManager静态类模拟了咋们通常使用的System.configuration，需要引用using System.Xml.Linq;

silverlight 实现读取app.config 或 web.config

ConfigurationManager类如下：

 /// <summary>    
    /// Access appSettings from a configuration file    
    /// </summary>    
    /// <remarks>Your appConfig file must be in the root of your applcation</remarks>   
    public static class ConfigurationManager
    {
         static ConfigurationManager()
        {
            AppSettings = new Dictionary<string, string>();
            ReadSettings();
        }
        public static Dictionary<string, string> AppSettings { get; set; }
        private static void ReadSettings()
        {
            // Get the name of the executing assemby - we are going to be looking in the root folder for           
            // a file called app.config           
            string assemblyName = Assembly.GetExecutingAssembly().FullName;
            assemblyName = assemblyName.Substring(0, assemblyName.IndexOf(','));
            string url = String.Format("{0};component/app.config", assemblyName);
            StreamResourceInfo configFile = Application.GetResourceStream(new Uri(url, UriKind.Relative));
            if (configFile != null && configFile.Stream != null)
            {
                Stream stream = configFile.Stream;
                XDocument document = XDocument.Load(stream);
                foreach (XElement element in document.Descendants("appSettings").DescendantNodes())
                {
                    AppSettings.Add(element.Attribute("key").Value, element.Attribute("value").Value);
                }
            }
        }
    }

Unlike the full framework, Silverlight 4 doesn’t have built in support to read from an application configuration file – theSystem.Configuration.ConfigurationManager isn’t part of the framework. Of course, Silverlight is a bit different to other applications where users may need to gain access to an app.config file but nevertheless it’s sometimes nice to store and retrieve configuration data in a familiar way.

So here’s a quick and easy way to do it.

Add an XML file to the root of your Silverlight project, rename it to app.config and set it’s build action to Resource.

silverlight 实现读取app.config 或 web.config

Whack in some appSettings in the same way you would a normal configuration file.

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appSettings>
    <add key="serviceUrl" value="http://myservice.com"/>
    <add key="guestAccountEmail" value="guest@mycompany.com"/>
  </appSettings>
</configuration>

Now create your very own ConfigurationManager class (note, you’ll need to add have a reference to System.Xml.Linq).

using System;
using System.Windows;
using System.Collections.Generic;
using System.Windows.Resources;
using System.IO;
using System.Xml.Linq;
using System.Reflection;
 
namespace GoogleReader.API.Tests
{
    /// <summary>
    /// Access appSettings from a configuration file
    /// </summary>
    /// <remarks>Your appConfig file must be in the root of your applcation</remarks>
    public static class ConfigurationManager
    {
 
        static ConfigurationManager()
        {
            AppSettings = new Dictionary<string, string>();
            ReadSettings();
        }
 
        public static Dictionary<string, string> AppSettings { get; set; }
 
        private static void ReadSettings()
        {
            
            // Get the name of the executing assemby - we are going to be looking in the root folder for
            // a file called app.config
            string assemblyName = Assembly.GetExecutingAssembly().FullName;
            assemblyName  = assemblyName.Substring(0, assemblyName .IndexOf(','));
            string url = String.Format("{0};component/app.config", assemblyName);
 
            StreamResourceInfo configFile = Application.GetResourceStream(new Uri(url, UriKind.Relative));
 
            if (configFile != null && configFile.Stream != null)
            {
                Stream stream = configFile.Stream;
                XDocument document = XDocument.Load(stream);
 
                foreach (XElement element in document.Descendants("appSettings").DescendantNodes())
                {
                    AppSettings.Add(element.Attribute("key").Value, element.Attribute("value").Value);
                }
            }
        }
    }
}
 

 

And write the code you’re used to.

 
// Give me a url please
string serviceUrl = ConfigurationManager.AppSettings["serviceUrl"];

Easy.