[英]LINQ to XML to POCO object
I've got an XML file that I want to turn in to a list of POCO objects. 我有一个XML文件,我想将其转换为POCO对象列表。
I have the following working code to read the XML and create objects from it. 我有以下工作代码来读取XML并从中创建对象。 I just want to check this is a good way to do this and I'm not missing any tricks.
我只是想检查这是一个很好的方法来做到这一点,我不会错过任何技巧。 In particular with regards to the nested Linq query.
特别是关于嵌套的Linq查询。
XDocument xmlDoc = XDocument.Load(path);
var q = from file in xmlDoc.Descendants("File")
select new ImportDefinition()
{
Name = file.Attribute("Name").Value,
TypeName = file.Attribute("TypeName").Value,
ColumnMappings =
(
from map in file.Descendants("ColumnMap")
select new ColumnMap()
{
DatabaseColumn = new Column()
{
Name = map.Element("DatabaseColumn").Attribute("Name").Value
}
}
).ToList<ColumnMap>()
};
List<ImportDefinition> def = q.ToList<ImportDefinition>();
Thanks 谢谢
In case your POCO objects do not only have string properties, XElement and XAttribute provide a wide selection of conversion operators to other types, including nullables in case the element/attribute doesn't exist. 如果您的POCO对象不仅具有字符串属性,则XElement和XAttribute会为其他类型提供广泛的转换运算符选择,包括在元素/属性不存在的情况下为nullables。
Example: 例:
XDocument xmlDoc = XDocument.Load(path);
var q = from file in xmlDoc.Descendants("File")
select new ImportDefinition()
{
Name = (string)file.Attribute("Name"),
TypeName = (string)file.Attribute("TypeName"),
Size = (int)file.Attribute("Size"),
LastModified = (DateTime?)file.Attribute("LastModified"),
// ...
};
Maybe try an explicit conversion 也许尝试一下明确的转换
public class ColumnMap
{
public static explicit operator ColumnMap(XElement xElem)
{
return new ColumnMap()
{
DatabaseColumn = new Column()
{
Name = xElem.Element("DatabaseColumn").Attribute("Name").Value
}
};
}
}
public class ImportDefinition
{
public static explicit operator ImportDefinition(XElement xElem)
{
return new ImportDefinition()
{
Name = (string)xElem.Attribute("Name"),
TypeName = (string)xElem.Attribute("TypeName"),
Size = (int)xElem.Attribute("Size"),
LastModified = (DateTime?)xElem.Attribute("LastModified"),
ColumnMappings = xElem.Descendants("ColumnMap").Select(xelem => (ColumnMap)xelem).ToList()
};
}
}
Then use it like so: 然后像这样使用它:
XDocument xmlDoc = XDocument.Load(path);
List<ImportDefinition> importDefinitions = xmlDoc.Descendants("File").Select(xElem => (ImportDefinition)xElem).ToList()
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