\t\t当异步请求与Silverlight相遇时，彼此通信问题的解决办法

当异步请求与Silverlight相遇时，彼此通信问题的解决办法

避免由于彼此“准备状态”而不能得到执行

避免由于加载冲突而被重复执行调用

避免由于加载的等待时差而错失良机

避免由于通信的需要而浪费掉异步的优越性

全局对象的重用、异步优势、重复浪费

<object id="silverlightControl" data="data:application/x-silverlight-2," type="application/x-silverlight-2" width="100%" height="100%">

    <param name="source" value="ClientBin/SilverlightXML.xap"/>

    <param name="onError" value="onSilverlightError" />

    <param name="background" value="white" />

    <param name="minRuntimeVersion" value="4.0.50401.0" />

    <param name="autoUpgrade" value="true" />

    <param name="windowless" value="true" />

    <param name="onload" value="onSilverlightLoaded" />

    <param name="enableHtmlAccess" value="true" />

    <a href="http://go.microsoft.com/fwlink/?LinkID=149156&v=4.0.50401.0" style="text-decoration:none">

    <img src="http://go.microsoft.com/fwlink/?LinkId=161376" alt="获取 Microsoft Silverlight" style="border-style:none"/>

    </a>

</object><iframe id="_sl_historyFrame" style="visibility:hidden;height:0px;width:0px;border:0px"></iframe>

var SilverlightPage = null, jsonData = null, IsRun = false;

$(function() {

    var obj = { userId: 12345 };

    $.post("AsynGetPersonalDevelopmentReport",

     obj,

      function(json) {

          jsonData = json;

          SilverlightPage && LoadData();//如果Silverlight准备好了，那么我就着手执行数据

      }, 'json');

});

function LoadData() {

      if (IsRun) { return; }

      IsRun = true;

      try {

          SilverlightPage.Process(jsonData);

      }

      catch (err) {

          var txt = "Silverlight调用异常。\n";

          txt += "异常描述: " + err.description + "\n\n";

          txt += "点击OK继续。\n\n";

          alert(txt);

      }

}

function onSilverlightLoaded() {

      var slHost = document.getElementById("silverlightControl");

      SilverlightPage = slHost.Content.Page;

      jsonData && LoadData();

}

function onSilverlightError(sender, args) {

      var appSource = ""; if (sender != null && sender != 0) { appSource = sender.getHost().Source; }

      var errorType = args.ErrorType; var iErrorCode = args.ErrorCode;

      if (errorType == "ImageError" || errorType == "MediaError") { return; }

      var errMsg = "Silverlight 应用程序中未处理的错误 " + appSource + "\n";

      errMsg += "代码: " + iErrorCode + "    \n";

      errMsg += "类别: " + errorType + "       \n";

      errMsg += "消息: " + args.ErrorMessage + "     \n";

      if (errorType == "ParserError") {

          errMsg += "文件: " + args.xamlFile + "     \n";

          errMsg += "行: " + args.lineNumber + "     \n";

          errMsg += "位置: " + args.charPosition + "     \n";

      }

      else if (errorType == "RuntimeError") {

          if (args.lineNumber != 0) {

              errMsg += "行: " + args.lineNumber + "     \n";

              errMsg += "位置: " + args.charPosition + "     \n";

          }

          errMsg += "方法名称: " + args.methodName + "     \n";

      }

      alert(errMsg);

}