Question

我在运行一小段代码时收到一条错误消息，说输入字符串不是正确的格式。问题来自解析这些html

标记一个

<td class="tdRow1Color" width="100%">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
    <tr><td class="plaintextbold">Item Number:&nbsp;1258</td></tr>
        <tr><td><img alt="" src="images/clear.gif" width="1" height="10" border="0"></td></tr>
    <tr>
        <td class="plaintext" valign="middle">&nbsp;<img src="../images/0note.gif" border="0" align="absmiddle">&nbsp;<a class="prodlink" href="writeReview.asp?number=1258"><i><u>Be the first to review this item</u></i></a></td>
            </tr>   
                <tr><td><img alt="" src="images/clear.gif" width="1" height="10" border="0"></td></tr>                    
         <tr><td class="plaintext"><b>RRP £50.00 - Now £39.99</b>          </td>

标记两个

<tr><td class="tdRow1Color" width="100%">
    <table width="100%" cellpadding="0" cellspacing="0" border="0">         
        <tr><td class="plaintextbold">Item Number:&nbsp;2525</td></tr>
            <tr><td><img alt="" src="images/clear.gif" width="1" height="10" border="0"></td></tr>
                <tr>
                <td class="plaintext" valign="middle">&nbsp;<img src="../images/0note.gif" border="0" align="absmiddle">&nbsp;<a class="prodlink" href="writeReview.asp?number=2525"><i><u>Be the first to review this item</u></i></a></td>
                </tr>   
                <tr><td><img alt="" src="images/clear.gif" width="1" height="10" border="0"></td></tr>
                 <tr><td class="plaintext">RRP £45 - Now £38

我正在通过此正则表达式转换RRP价格。

private Regex _originalPriceRegex = new Regex(@"RRP \s(\d+\.?\d+?)");

通过xpath获取RRP价格

ProductProperties.priceOriginal, new HtmlElementLocator("//td[@class='tdRow1Color']//td[@class='plaintext']//text()[starts-with(., 'RRP')]",

当xpath值传递到下面的函数时，似乎会出现问题。当它返回priceMatch.Groups [1] .Value

时抛出异常

 private string LookForOrignalPrice(HtmlNode node)
        {

            string text = node.InnerText;
            Match priceMatch = _originalPriceRegex.Match(text);
            if (priceMatch.Success)
                    Console.WriteLine("++++++price is " + priceMatch);
                    return priceMatch.Groups[1].Value;

                    return null;
        }

感谢您提供任何建议。

Answer 1

当使用它的良好做法来放置大括号时，否则你可能会遇到这样的错误。 priceMatch.Groups[1].Value为false时执行priceMatch.Success。

所以你应该改变你的代码：

  private string LookForOrignalPrice(HtmlNode node)
  {
    string text = node.InnerText;
    Match priceMatch = _originalPriceRegex.Match(text);
    if (priceMatch.Success) --> put braces to group the statements
    {
       Console.WriteLine("++++++price is " + priceMatch);
       return priceMatch.Groups[1].Value;
    }
    return null;
  }

抛出Formate异常“输入字符串格式不正确”

1 个答案: