对 XAttribute 值进行显式转换
我最近写了一段代码，看起来有点像这样：
IEnumerable<DTO.Employee> xEmployee =
from e in xDoc.Descendants("Employee")
where int.Parse(e.Attribute("Id").Value) == emp.Id
select new DTO.Employee
{
Id = (int)e.Attribute("Id"),
LastName = (string)e.Element("LastName"),
FirstName = (string)e.Element("FirstName"),
Email = (string)e.Element("Email")
};
但是，我对 where 子句中转换为 int 感到困惑。首先，我写了一些
where (int)(e.Attribute("Id").Value) == emp.Id
无法编译的东西。 为什么我可以对 (e.Attribute("Id")) 进行显式转换，但不能对 (e.Attribute("Id").Value) 执行此操作？
I recently wrote a piece of code that looked a bit like this:
IEnumerable<DTO.Employee> xEmployee =
from e in xDoc.Descendants("Employee")
where int.Parse(e.Attribute("Id").Value) == emp.Id
select new DTO.Employee
{
Id = (int)e.Attribute("Id"),
LastName = (string)e.Element("LastName"),
FirstName = (string)e.Element("FirstName"),
Email = (string)e.Element("Email")
};
However, I am confused about the casting to an int in the where clause. First, I'd written something like
where (int)(e.Attribute("Id").Value) == emp.Id
which didn't compile.
Why can I do a explicit cast on (e.Attribute("Id")), but can 't I do this on (e.Attribute("Id").Value)?
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查看 XAttribute< 的显式运算符重载/a> 类。
Check out the explicit operator overloads of the XAttribute class.
有一个 从
XAttribute到的显式转换int- 但没有从string（XAttribute.Value的类型）到int的显式转换。There is an explicit conversion from
XAttributetoint- but there's no explicit conversion fromstring(the type ofXAttribute.Value) toint.