Question

我知道这个问题很多。但我无法找到相关信息。

我在scala中将字符串传递给userdefined函数。字符串看起来像这样

<p>I want to use a track-bar to change a form's opacity.</p>

<p>This is my code:</p>

 <pre><code>decimal trans = trackBar1.Value / 5000;
this.Opacity = trans;
</code></pre>

<p>When I build the application, it gives the following error:</p>

<blockquote>
  <p>Cannot implicitly convert type 'decimal' to 'double'.</p>
</blockquote>

<p>I tried using <code>trans</code> and <code>double</code> but then the 
control doesn't work. This code worked fine in a past VB.NET project. </p>
,While applying opacity to a form should we use a decimal or double value?

我的用户定义函数如下所示

    case class bodyresults(text:String,code:String)
    val bodyudf = udf{ (body: String)  =>
     //Appending body tag explicitly to the xml before parsing  
    val xmlElems = xml.XML.loadString(s"""<?xml version="1.0" encoding="utf-
8"?> <!ENTITY nbsp "&#160;"> <body> ${body} </body>""")
    // extract the code inside the req
    val code = (xmlElems \\ "body" \\ "pre" \\ "code").text
    val text = (xmlElems \\ "body").text.replaceAll(s"${code}" ,"" )
    bodyresults(text, code)
    }

导致错误定义但未声明。所以我附上了。现在它的原因

Error:The markup in the document preceding the root element must be well-formed

请让我知道我做错了什么。

错误：根元素之前的文档中的标记必须格式正确。 Scala XML.loadString（）

0 个答案: