How to make transparent background of Silverlight 3 application?_问答_开发者

How to make transparent background of Silverlight 3 application?

开发者 https://www.devze.com 2022-12-11 12:15 出处：网络

How to make transparent background of Silverlight 3 application? I have the next code but it does not work (

          <html xmlns="http://www.w3.org/1999/xhtml" >
          <!-- saved from url=(0014)about:internet -->
          <head>
<title>BGtest</title>
<style type="text/css">
html, body {
    height: 100%;
    overflow: auto;
}
body {

    padding: 0;
    margin: 0;
}
#silverlightControlHost {
    height: 100%;
    text-align:center;
}
</style>

<script type="text/javascript">
    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 = "Unhandled Error in Silverlight Application " +  appSource + "\n" ;

        errMsg += "Code: "+ iErrorCode + "    \n";
        errMsg += "Category: " + errorType + "       \n";
        errMsg += "Message: " + args.ErrorMessage + "     \n";

        if (errorType == "ParserError") {
            errMsg += "File: " + args.xamlFile + "     \n";
            errMsg += "Line: " + args.lineNumber + "     \n";
            errMsg += "Position: " + args.charPosition + "     \n";
        }
        else if (errorType == "RuntimeError") {           
            if (args.lineNumber != 0) {
                errMsg += "Line: " + args.lineNumber + "     \n";
                errMsg += "Position: " +  args.charPosition + "     \n";
            }
            errMsg += "MethodName: " + args.methodName + "     \n";
        }

        throw new Error(errMsg);
    }
</script>
       <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /></head>
          <body bgcolor="#00FF00">
<form id="form1" runat="server" style="height:100%">
<div id="silverlightControlHost">
    <object data="data:application/x-silverlight-2," type="application/x-silverlight-2" width="100%" height="100%">
      <param name="source" value="BGtest.xap"/>
      <param name="onError" value="onSilverlightError" />
                     <param name="plug开发者_C百科inbackground" value="Transparent" /> 
                <param name="background" value="#80FF0000"/>
                     <param name="windowless" value="true" />  
      <param name="minRuntimeVersion" value="3.0.40624.0" />
      <param name="autoUpgrade" value="true" />
      <a href="http://go.microsoft.com/fwlink/?LinkID=149156&v=3.0.40624.0" style="text-decoration:none">
          <img src="http://go.microsoft.com/fwlink/?LinkId=108181" alt="Get Microsoft Silverlight" style="border-style:none"/>
      </a>
    </object><iframe id="_sl_historyFrame" style="visibility:hidden;height:0px;width:0px;border:0px"></iframe></div>
</form>
                    </body>
                  </html>

You've got a partially-transparent background there at the moment (#80FF0000). Why not change it to fully transparent like this:

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

You can then draw whatever you want to be partially-transparent in your Silverlight app. However, be warned that transparent background with windowsless=true can be REALLY slow. It's better to avoid this using clever graphic design to fit the Silverlight control into the page, if possible.