正在解析缺少预期子节点的 XML

Question

我正在使用 LINQ 解析一个 XML 片段到 XML，我发现我正在 selecting 的节点之一缺少我期望的子节点。

例子XML

<CustomerList>
  <Customer>
    <LastName>Smith</LastName>
    <FirstName>Todd</FirstName>
  </Customer>
  <Customer>
    <LastName>Jones</LastName>
    <FirstName>Fred</FirstName>
  </Customer>
  <Customer>Tom Jones</Customer> <!-- Missing child nodes -->
</CustomerList>

当我尝试提取 LastName 和 FirstName 值时，出现错误 Object reference not set to an instance of an object.

使用 LINQ

解析 XML

XDocument xml = XDocument.Parse(xmlResponse);
List<CustomerModel> nodeList = xml.Descendants("CustomerList")
                          .Descendants("Customer")
                          .Select(x => new CustomerModel
                          {
                            LastName = x.Element("LastName").Value,
                            FirstName = x.Element("FirstName").Value,
                          }).ToList<CustomerModel>();

在 <Customer> 节点没有 <LastName> 和 <FirstName> 节点的情况下，我该如何跳过它们或者更好，甚至 select第一名？

Answer 1

我的建议是：

XDocument xml = XDocument.Parse(xmlResponse);
List<CustomerModel> nodeList = xml.Descendants("CustomerList")
                      .Descendants("Customer")
                      .Where(x => x.Element("LastName") != null && x.Element("FirstName") != null)
                      .Select(x => new CustomerModel
                      {
                        LastName = x.Element("LastName").Value,
                        FirstName = x.Element("FirstName").Value,
                      }).ToList<CustomerModel>();

正在解析缺少预期子节点的 XML

Parsing XML that is missing expected child nodes

c#

xml

linq

linq-to-xml