Silverlight作为一个精简版的.NET framework,没有为配置文件提供相应的支持。我们无法像在winForm中那样使用System.Configuration.ConfigurationManager 来访问app.config中的配置信息。所以比较好的一个方式就是自己写一个配置文件管理类ConfigurationManager。
首先,在工程中创建一个XML文件,取名为app.config,记得放在工程的根目录,方便后面设置路径。把Build Action设成Resource,随便在app.config中写点东西。
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<appSettings>
<add key="name" value="srzhz"/>
<add key="university" value="Tsinghua University"/>
</appSettings>
</configuration>
然后要开始创建这个ConfigurationManager类了。
首先在工程上按右键点击Add Reference,之后选择System.Xml.Linq。(如果没加的话无法引入命名空间System.Xml.Linq)
然后在ConfigurationManager类中写入如下代码
using System;
using System.Windows;
using System.Collections.Generic;
using System.Windows.Resources;
using System.IO;
using System.Xml.Linq;
using System.Reflection;
namespace SilverlightApplication92
{
/// <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);
}
}
}
}
}
之后你就可以通过调用这个类来获得配置信息了。例如:
String name = ConfigurationManager.AppSettings["name"];
另外,使用WebClient也可以实现配置文件的访问。实现方法如下:
public static void ReadFrequencyConfigFile(Action<XDocument> p_result)
{
WebClient webClient = new WebClient();
string uri = Application.Current.Host.Source.AbsoluteUri; //服务器路径
int index = uri.IndexOf("/ClientBin", System.StringComparison.Ordinal);
uri = uri.Substring(0, index + 10) + "/FrequencyConfig.xml";
webClient.OpenReadAsync(new Uri(uri, UriKind.Absolute));
webClient.OpenReadCompleted += (s1, e1) =>
{
if (e1.Error != null)
{
throw new Exception("频率配置文件读取错误!");
}
var doc = XDocument.Load(e1.Result);
if (p_result != null)
{
p_result(doc);
}
};
}