仅在信息存在的情况下打印节点的值

我正在寻找只有在节点中有值时才打印出客户的选项。我可以访问信息并将其打印出来，但是，由于while循环，它会在每个帐户下打印出信息。任何帮助或暗示将不胜感激，谢谢。仅在信息存在的情况下打印节点的值

下面是访问XML代码：

XPathNodeIterator ItemOptionsIter; 
String ItemsearchStringOptions = "Order/Items/Item/CustomerOptions"; 
ItemOptionsIter = nav.Select(ItemsearchStringOptions); 

if (ItemIter.Current.SelectSingleNode("CustomerOptions") != null) 
{ 
    while (ItemOptionsIter.MoveNext()) 
    { 
     XPathNodeIterator ItemOptions = ItemOptionsIter.Current.SelectChildren(XPathNodeType.Element); 
     if (ItemOptions.Current.HasChildren) 
     { 
      txtItemInfo.Text = txtItemInfo.Text + "Size: " + ItemOptions.Current.SelectSingleNode("Size") + Environment.NewLine; 
      txtItemInfo.Text = txtItemInfo.Text + "Color: " + ItemOptions.Current.SelectSingleNode("Color") + Environment.NewLine; 
      txtItemInfo.Text = txtItemInfo.Text + "-------------------------------------------------" + Environment.NewLine; 
     } 
    } 
}

下面是XML文件：

<Item> 
    <PartNo>JETSWEATER</PartNo> 
    <Description>N.Y. Jets Sweatshirt</Description> 
    <UnitPrice>10.50</UnitPrice> 
    <Quantity>2</Quantity> 
    <TotalCost>21.00</TotalCost> 
    <CustomerOptions> 
     <Size>M</Size> 
     <Color>Green</Color> 
    </CustomerOptions> 
</Item> 
<Item> 
    <PartNo>JETSSWEATER</PartNo> 
    <Description>N.Y. Jets Sweatshirt</Description> 
    <UnitPrice>7.50</UnitPrice> 
    <Quantity>3</Quantity> 
    <TotalCost>22.50</TotalCost> 
    <CustomerOptions> 
     <Size>S</Size> 
     <Color>White</Color> 
    </CustomerOptions> 
</Item> 
<Item> 
    <PartNo>JETSFLAG</PartNo> 
    <Description>N.Y. Jets Flag for display</Description> 
    <UnitPrice>5.00</UnitPrice> 
    <Quantity>1</Quantity> 
    <TotalCost>5.00</TotalCost> 
    <CustomerOptions/> 
</Item>

最后这里是我的输出的一个示例：

 
Part Number: JETSWEATER 
Description: N.Y. Jets Sweatshirt 
UnitPrice: 10.50 
Quantity: 2 
TotalCost: 21.00 
------------------------------------------------- 
Size: M 
Color: Green 
------------------------------------------------- 
Size: S 
Color: White 
------------------------------------------------- 
Part Number: JETSSWEATER 
Description: N.Y. Jets Sweatshirt 
UnitPrice: 7.50 
Quantity: 3 
TotalCost: 22.50 
------------------------------------------------- 
Size: M 
Color: Green 
------------------------------------------------- 
Size: S 
Color: White 
------------------------------------------------- 
Part Number: JETSFLAG 
Description: N.Y. Jets Flag for display 
UnitPrice: 5.00 
Quantity: 1 
TotalCost: 5.00 
------------------------------------------------- 
Size: M 
Color: Green 
------------------------------------------------- 
Size: S 
Color: White 
-------------------------------------------------

来源

2012-10-22 nate00234

试着改变你的XPath表达式'订单/项目/产品/ CustomerOptions [布尔（*）]' – Pawel

@ nate00234做了上述工作适合你，或者你还在阻碍？ – JWiley

我会说构造你的主循环迭代通过Item节点并打印出它们的值，然后在你想要的地方打印出来的选项，这样做：

XPathNodeIterator options = item.SelectNodes("CustomerOptions/*[. != '']"); 
if(options.Count != 0) 
{ 
    XPathNavigator size = item.SelectSingleNode("CustomerOptions/Size[. != '']"); 
    if(size != null) 
    { 
    txtItemInfo.Text = txtItemInfo.Text + "Size: " + size.Value + Environment.NewLine;    
    } 
    // Then do the same for color 

    txtItemInfo.Text = txtItemInfo.Text + "-------------------------------------------------" + Environment.NewLine; 
}

来源

2013-01-09 03:02:37 JLRishe

仅在信息存在的情况下打印节点的值

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