不管是报表图表还是电子地图，将Silverlight应用程序嵌入到MOSS中，可以大大提高MOSS站点的用户体验。而合理的应用WebPart对嵌入的Silverlight进行封装则能够减少开发复杂程度。
最近参与的项目中有不少这样的案例，于是便写了一个简单的Silverlight封装WebPart，分享与此，希望能够帮助又需要的朋友。
（第一次写WebPart，请多指教）
考虑到的问题有：
- xap文件缓存期限
- 承载容器的样式
- xap文件路径配置
- xap文件接收的参数
没有考虑到的问题有：
- 安全性（绝大多数MOSS应用都是intranet的，相对安全）
代码如下：
/****************************** Module Header ******************************\
* Module Name: SilverLightWrapper.cs
* Project: CarolLib.MOSS.WebParts
* Author: Lance Zhang
* Copyright (c) CarolLib Co., Ltd.
*
* Provide a way to wrap Silverlight xap with webpart,
* and output the rendered div to web page.
*
* Key Features:
* ==============================================================
*
* @ - Private different timespan unit to control the browser cache.
* @ - Can pass custom parameter(s, by split) to silverlight application.
* @ - Customize containner div's style.
*
* ==============================================================
*
* History:
* * 8/19/2009 13:53 PM Lance Zhang Created
* * 8/24/2009 21:29 PM Lance Zhang Add ContainerStyle
* * 9/09/2009 21:29 PM Lance Zhang Add CustomParams
\***************************************************************************/
using System;
using System.Runtime.InteropServices;
using System.Text;
using System.Web.UI;
using Microsoft.SharePoint.WebPartPages;
using System.Web.UI.WebControls.WebParts;
using System.ComponentModel;namespace CEAir.InfoPortal.WebParts
{
[Guid("803617a2-9dc9-4eb8-b05c-3e064bc12123")]
public class SilverLightWrapper : System.Web.UI.WebControls.WebParts.WebPart
{
#region ctor.public SilverLightWrapper()
{
}
#endregion#region Propertiesprivate string containerStyle = "PADDING-BOTTOM: 10px; PADDING-LEFT: 10px; WIDTH: 730px; PADDING-RIGHT: 20px; BACKGROUND: url(/_LAYOUTS/SL3/img/it_task_bg.jpg) #fff no-repeat left top; FLOAT: left; HEIGHT: 600px; PADDING-TOP: 10px";
[Personalizable]
[WebBrowsable]
[WebDisplayName("容器div样式")]
[Category("个性设置")]
public string ContainerStyle
{
get { return containerStyle; }
set { containerStyle = value; }
}private string customParams = string.Empty;
[Personalizable]
[WebBrowsable]
[WebDisplayName("CustomParams")]
[Category("自定义参数")]
public string CustomParams
{
get { return customParams; }
set { customParams = value; }
}private string path = "/_LAYOUTS/SL3/StatusReport.xap";
[Personalizable]
[WebBrowsable]
[WebDisplayName("xap文件路径")]
[WebDescription("例如:/_LAYOUTS/SL3/StatusReport.xap")]
[Category("个性设置")]
public string Path
{
get { return path; }
set { path = value; }
}public string CurrentUser
{
get
{
return this.Context.User.Identity.Name;
}
}private string cacheUnit = "天";
[Personalizable]
[WebBrowsable]
[WebDisplayName("缓存时间单位")]
[WebDescription("例如:分、时、天、月、年")]
[Category("缓存设置")]
public string CacheUnit
{
get { return cacheUnit; }
set { cacheUnit = value; }
}#endregion#region Override Membersprotected override void CreateChildControls()
{
string cacheKey = GetCacheKey(); StringBuilder sl
= new StringBuilder();
sl.AppendLine(string.Format("<div id=\"silverlightControlHost\" style=\"{0}\">", ContainerStyle));
sl.AppendLine("<object data=\"data:application/x-silverlight-2,\" type=\"application/x-silverlight-2\" width=\"100%\" height=\"100%\">");
sl.AppendLine(string.Format("<param name=\"source\" value=\"" + Path + "?version={0}\"/>", cacheKey));
sl.AppendLine("<param name=\"onError\" value=\"onSilverlightError\" />");
sl.AppendLine("<param name=\"background\" value=\"white\" />");
sl.AppendLine("<param name=\"minRuntimeVersion\" value=\"3.0.40818.0\" />");
sl.AppendLine("<param name=\"autoUpgrade\" value=\"true\" />");
sl.AppendLine(string.Format("<param name=\"initParams\" value=\"user={0},{1}\" />", this.CurrentUser, this.CustomParams));
sl.AppendLine("<a href=\"http://go.microsoft.com/fwlink/?LinkID=149156&v=3.0.40818.0\" style=\"text-decoration:none\">");
sl.AppendLine("<img src=\"http://go.microsoft.com/fwlink/?LinkId=161376\" alt=\"获取 Microsoft Silverlight\" style=\"border-style:none\"/>");
sl.AppendLine("</a>");
sl.AppendLine("</object>");
sl.AppendLine("<iframe id=\"_sl_historyFrame\" style=\"visibility:hidden;height:0px;width:0px;border:0px\">");
sl.AppendLine("</iframe>");
sl.AppendLine("</div>"); LiteralControl silverlightHost
= new LiteralControl(sl.ToString());
this.Controls.Add(silverlightHost);
}private string GetCacheKey()
{
string cacheKey = string.Empty;switch (CacheUnit)
{
case "分":
cacheKey = DateTime.Now.ToString("yyyyMMddhhmm");
break;
case "时":
cacheKey = DateTime.Now.ToString("yyyyMMddhh");
break;
case "天":
cacheKey = DateTime.Now.ToString("yyyyMMdd");
break;
case "月":
cacheKey = DateTime.Now.ToString("yyyyMM");
break;
default:
cacheKey = DateTime.Now.ToString("yyyy");
break;
}
return cacheKey;
}#endregion
}
} 
