Question

我有一些像这样的xml;

<PurchaseOrders>
  <Owner ContactId="39" Owner="M Mouse" Owed="1,609.39" WeeklyDeductionRate="10.00" FromMinimumReturn="110.00" DeductionRate="0.0150" TotalDeductions="34.14" TotalToBeReturned="1,575.24">
    <Products ProductId="33" Cost="5.00" Quantity="0.40" />
    <Products ProductId="34" Cost="1.80" Quantity="0.90" />
    <Products ProductId="41" Cost="2.30" Quantity="1.30" />
    <Products ProductId="42" Cost="2.25" Quantity="1.30" />
    <Products ProductId="43" Cost="1.60" Quantity="10.50" />
    <Products ProductId="57" Cost="7.00" Quantity="13.30" />
    <Products ProductId="59" Cost="9.63" Quantity="47.00" />
    <Products ProductId="61" Cost="6.23" Quantity="32.60" />
    <Products ProductId="66" Cost="1.00" Quantity="5.60" />
    <Products ProductId="92" Cost="0.50" Quantity="4.80" />
    <Products ProductId="125" Cost="1.00" Quantity="3.80" />
    <Products ProductId="139" Cost="6.50" Quantity="3.90" />
    <Products ProductId="156" Cost="1.50" Quantity="1.70" />
    <Products ProductId="161" Cost="5.80" Quantity="44.20" />
    <Products ProductId="171" Cost="3.88" Quantity="12.00" />
    <Products ProductId="173" Cost="4.55" Quantity="32.50" />
    <Products ProductId="175" Cost="5.00" Quantity="52.90" />
    <Products ProductId="182" Cost="0.50" Quantity="18.50" />
    <Products ProductId="198" Cost="0.50" Quantity="27.40" />
    <Products ProductId="220" Cost="1.50" Quantity="38.60" />
    <Products ProductId="231" Cost="6.00" Quantity="0.90" />
    <Products ProductId="236" Cost="0.85" Quantity="2.10" />
  </Owner>
  <Owner ContactId="42" Owner="F Flintstone" Owed="710.01" WeeklyDeductionRate="10.00" FromMinimumReturn="110.00" DeductionRate="0.0150" TotalDeductions="20.65" TotalToBeReturned="689.35">
    <Products ProductId="32" Cost="6.00" Quantity="0.50" />
    <Products ProductId="33" Cost="5.00" Quantity="2.00" />
    <Products ProductId="34" Cost="1.80" Quantity="7.80" />
    <Products ProductId="57" Cost="7.00" Quantity="3.10" />
    <Products ProductId="59" Cost="10.00" Quantity="16.30" />
    <Products ProductId="61" Cost="6.60" Quantity="13.90" />
    <Products ProductId="131" Cost="0.90" Quantity="1.70" />
    <Products ProductId="156" Cost="1.50" Quantity="1.50" />
    <Products ProductId="161" Cost="5.80" Quantity="17.40" />
    <Products ProductId="164" Cost="1.10" Quantity="3.10" />
    <Products ProductId="171" Cost="3.80" Quantity="5.70" />

我的计划是遍历元素并从其属性中提取信息，然后通过该所有者的元素运行循环。

为此，我尝试了以下内容（添加日志记录以查看我得到的内容）。

 Dim doc As New XmlDocument()
        doc.Load(GenerateStreamFromString(SubmissionsEditor.Text))
        Dim elemList As XmlNodeList = doc.GetElementsByTagName("Owner")
        Dim pElemList As XmlNodeList = doc.GetElementsByTagName("Products")
        For i As Integer = 0 To elemList.Count - 1
            Dim lSupplierId As Integer = CInt(elemList(i).Attributes("ContactId").Value)
            SiAuto.Main.LogInt(NameOf(lSupplierId), lSupplierId)
            For j As Integer = 0 To pElemList.Count - 1
                Dim lProductId As Integer = CInt(pElemList(i).Attributes("ProductId").Value)
                SiAuto.Main.LogInt("Number of Products that will be looped Through", pElemList.Count - 1)
                SiAuto.Main.LogInt(NameOf(lProductId), lProductId)
            Next
        Next

我对生成的日志文件感到吃惊，因为我期望循环的产品数量达到22个。显然，循环结构的一部分是不正确的，有些人可以指向我？

由于

enter image description here

Answer 1

您的循环实际上正在运行所有产品元素，因为您的代码详细说明了所有者与其产品之间没有任何关联。如果您更喜欢当前的XPath方法，则应选择当前所有者元素的子元素的所有产品元素：

Dim doc As New XmlDocument()
        doc.Load(GenerateStreamFromString(SubmissionsEditor.Text))
        Dim elemList As XmlNodeList = doc.GetElementsByTagName("Owner")
        For i As Integer = 0 To elemList.Count - 1
        Dim pElemList As XmlNodeList = elemList(i).SelectNodes("//Products")
            Dim lSupplierId As Integer = CInt(elemList(i).Attributes("ContactId").Value)
            SiAuto.Main.LogInt(NameOf(lSupplierId), lSupplierId)
            For j As Integer = 0 To pElemList.Count - 1
                Dim lProductId As Integer = CInt(pElemList(j).Attributes("ProductId").Value)
                SiAuto.Main.LogInt("Number of Products that will be looped Through", pElemList.Count - 1)
                SiAuto.Main.LogInt(NameOf(lProductId), lProductId)
            Next
        Next

如果您更喜欢在实现中使用XPath和For Each循环（这有助于避免错误的索引拼写错误），您的代码可能如下所示：

        Dim doc As New XmlDocument()
        doc.Load(GenerateStreamFromString(SubmissionsEditor.Text))
        Dim elemList As XmlNodeList = doc.SelectNodes("//Owner")
        For Each elem As XmlNode In elemList
            Dim pElemList As XmlNodeList = elem.SelectNodes("//Products")
            Dim lSupplierId As Integer = CInt(elem.Attributes("ContactId").Value)
            SiAuto.Main.LogInt(NameOf(lSupplierId), lSupplierId)
            For Each pElem As XmlNode In pElemList
                Dim lProductId As Integer = CInt(pElem.Attributes("ProductId").Value)
                SiAuto.Main.LogInt("Number of Products that will be looped Through", pElemList.Count - 1)
                SiAuto.Main.LogInt(NameOf(lProductId), lProductId)
            Next
        Next

循环遍历xml文件

1 个答案: