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Silverlight获取WebHost配置信息:WebClient和XmlSerializer模拟

在我们的silverlight项目中,是被打包为xap zip文件下载到客户端,所以silverlight中的app配置文件我们不能直接修改,而在其宿主web host中的web.config在服务端我们也不能直接访问。在我们的项目中遇见了这个问题所以我就有了此博客。
先说明解决这个问题的方案有:

1:调用wcf,webservice,Asp.net页面等服务端数据源,异步显示在我们的UI。

2:利用silverlight项目的宿主页面 object,传入初始化参数,在silverlight app中获取。

上面的方案都是针对于我们的少量有限配置信息的获取。我这里做的是利用在服务端的xml配置文件来模拟配置文件(为什么不用web.config?以为存在权限信息的问题,所以我觉得尽量避免此文件信息暴露)。在silverlight的异步加载xml文档并解析xml文档。形成配置信息。

为了全局使用,早些加载xml文档,我们需要在app中加一句:

SLConfigManager.Current.ConfigPath = "../SlConfig.xml";//配置文件的路径,相对于我们的xap文件路径。

我们先看一下测试xml:

<?xml version="1.0" encoding="utf-8" ?>
<Configuration>
<appSettings>
<add key="test1" value="123"></add>
<add key="test2" value="1"></add>
</appSettings>
<Class ClassID="111">
<Student Age="123">
<Name>ddddd</Name>
</Student>
<Student Age="28">
<Name>111</Name>
</Student>
</Class>
</Configuration>
这是我们可以使用:

void Page1_Loaded(object sender, RoutedEventArgs e)
{
MessageBox.Show(SLConfigManager.Current.GetSection<Class>("Class").ClassID + "");
MessageBox.Show(SLConfigManager.Current.GetAppSettings("test1").ToString());
MessageBox.Show(SLConfigManager.Current.GetAppSettings<Sex>("test2").ToString());
}
public enum Sex
{
man,woman
}

在这里我们模拟了AppSettings,和Section(注:这里的section,不需要预申明,在利用xml转化形成的,更利于我们的配置扩展性,使用到了XmlRoot,XmlElement等attribute),在看看我们的Class类:

using System.Xml.Serialization;
namespace SilverlightApplication2
{
[XmlRoot("Student")]
public class Student
{
[XmlElement("Name")]
public string Name
{ get; set; }

[XmlAttribute("Age")]
public int Age
{
get;
set;
}
}

[XmlRoot("Class")]
public class Class
{
[XmlAttribute("ClassID")]
public int ClassID
{
get;
set;
}

[XmlArray()]
[XmlArrayItem("Students")]
public System.Collections.Generic.List<Student> Students
{
get;
set;
}
}
}

最后需要说明的是:在于我们的项目中可能存在xml文件还没有加载,的情况,所以加入了时间支持和IsLoaded属性标示。

源码:

View Code
using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Xml;
using System.Xml.Linq;
using System.Linq;
using System.Collections.Generic;
using Green.Utility.Utils;
namespace SilverlightApplication2
{
public delegate void LoadComplete();

public class SLConfigManager
{
private XDocument document = null;

private static readonly SLConfigManager _SLConfigManager = new SLConfigManager();
private Dictionary<string, object> dict = new Dictionary<string, object>();
private Dictionary<string, string> appSettings = new Dictionary<string, string>();
private string _ConfigPath = null;

public static SLConfigManager Current
{
get
{
return _SLConfigManager;
}
}

public string ConfigPath
{
get { return _ConfigPath; }
set
{
if (_ConfigPath != value)
{
_ConfigPath = value;
LoadResource();
}
}
}

public bool IsLoaded
{
get;
private set;
}
public event LoadComplete LoadComplete;

public void EnsureLoadResource()
{

if (document == null)
{
LoadResource();
}
}

protected virtual void LoadResource()
{
if (string.IsNullOrEmpty(ConfigPath))
{
throw new Exception("ConfigPath is required!");
}

dict.Clear();
Uri url = new Uri(Application.Current.Host.Source, ConfigPath);
WebClient client = new WebClient();
client.OpenReadCompleted += new OpenReadCompletedEventHandler(client_OpenReadCompleted);
client.OpenReadAsync(url, client);
}

protected virtual void client_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{
if (e.Error != null)
{
throw e.Error;
}

var sw = new System.IO.StreamReader(e.Result);
var xml = sw.ReadToEnd();
document = XDocument.Parse(xml);
sw.Close();
e.Result.Close();
sw = null;

GetappSettings();

IsLoaded = true;
if (LoadComplete != null)
{
LoadComplete();
}
}

protected virtual void GetappSettings()
{
if (document != null)
{
var appSettingsel = document.Root.Element("appSettings");
if (appSettings != null)
{
appSettingsel.Elements("add").ToList().ForEach(e =>
{
var key = e.Attribute("key").Value;
var value = e.Attribute("value").Value;
if (!string.IsNullOrEmpty(key)&&!this.appSettings.ContainsKey(key))
{
this.appSettings.Add(key, value);
}
});
}
}
}

public T GetSection<T>(string section) where T : class ,new()
{
if (document == null)
{
// throw new Exception("Config Document is null!");
}
if (!dict.ContainsKey(section))
{
var el = document.Root.Descendants().SingleOrDefault(t => t.Name == section);
var xml = el.ToString();
dict.Add(section, XmlSerializer<T>(xml));
}
return dict[section] as T;
}

protected virtual T XmlSerializer<T>(string xml) where T : class ,new()
{
System.Xml.Serialization.XmlSerializer serialzer = new System.Xml.Serialization.XmlSerializer(typeof(T));
System.IO.MemoryStream ms = new System.IO.MemoryStream(System.Text.Encoding.UTF8.GetBytes(xml));
var obj = serialzer.Deserialize(ms) as T;
ms.Flush();
ms.Close();
ms = null;
return obj;
}

public T GetAppSettings<T>(string key) where T : IConvertible
{
if (appSettings.ContainsKey(key))
{
var val = this.appSettings[key];
if (string.IsNullOrEmpty(val))
return default(T);
if (typeof(T).IsEnum)
{
return (T)Enum.Parse(typeof(T), val, true);
}
return (T)Convert.ChangeType(val, typeof(T), null);
}
return default(T);
}

public string GetAppSettings(string key)
{
return GetAppSettings<string>(key);
}
}
}

最后附:测试程序打包下载

来源:http://www.cnblogs.com/whitewolf/archive/2011/07/06/slconfig.html

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