我正在尝试序列化和反序列化(粗略地):
class MyDto
{
public string Name { get; set; }
private List<string> _uniqueNameStrings = new List<string>();
[XmlArray("UniqueNames")]
[XmlArrayItem("string")]
public List<string> UniqueNameStrings
{
get => _uniqueNameStrings;
set => _uniqueNameStrings = value ?? new List<string>();
}
}
以前的版本没有null
检查,不工作:
class MyDto
{
public string Name { get; set; }
[XmlArray("UniqueNames")]
[XmlArrayItem("string")]
public List<string> UniqueNameStrings { get; set; }
}
为此类生成的架构:
<xs:complexType name="MyDto">
<xs:sequence>
<xs:element minOccurs="0" maxOccurs="1" name="Name" nillable="true" type="xs:string" />
<xs:element minOccurs="0" maxOccurs="1" name="UniqueNames" type="ArrayOfString" />
</xs:sequence>
</xs:complexType>
<xs:complexType name="ArrayOfString">
<xs:sequence>
<xs:element minOccurs="0" maxOccurs="unbounded" name="string" nillable="true" type="xs:string" />
</xs:sequence>
</xs:complexType>
和序列化的效果:
<MyDto>
<Name>MyDtoName</Name>
<UniqueNames>
<string>SomeName</string>
<string>SomeOtherName</string>
<!-- ... <-->
</UniqueNames>
</MyDto>
因此序列化看起来工作正常,问题是在反序列化时,XML似乎完全忽略了字符串值。这是调用代码:
using System.IO.Abstractions;
private IFileSystem _fileSystem;
public void SerializeDto(object dto, string filePath)
{
var serializer = new XmlSerializer(dto.GetType());
using (var streamWriter = _fileSystem.FileStream.Create(filePath, FileMode.Create, FileAccess.Write))
{
serializer.Serialize(streamWriter, dto);
streamWriter.Flush();
}
}
public T DeserializeDto<T>(string filePath) where T : class
{
var serializer = new XmlSerializer(typeof(T));
using (var streamReader = _fileSystem.FileStream.Create(filePath, FileMode.Open, FileAccess.Read))
{
return (T) serializer.Deserialize(streamReader);
}
}
Name
属性(以及我为简单起见省略的所有其他属性)被正确反序列化,而UniqueNames
被留空。我在set
方法上设置了一个断点,我可以看到反序列化器用value
调用它,相当于一个空的List<string>
,好像<string>
元素不存在一样。由于我无法查看XML代码以查看其中发生的情况,因此我陷入困境。有关为什么XmlSerializer忽略字符串数组中的值的任何想法?特别是因为它本身将值序列化为这种格式,现在无法处理它...
试试这个:
[XmlRoot]
public class MyDto
{
[XMLElement]
public string Name { get; set; }
[XmlArray("UniqueNames"), XmlArrayItem("UniqueName")]
public List<string> UniqueNameStrings { get; set; }
public MyDto() { }
}
我无法从示例代码中看出,但它可能是一个缺少的空类构造函数。我还更新了XmlArrayItem,认为可能存在与调用'string'的冲突。
给这个序列化器一个镜头:
public static void Serialize<T>(T t, string filePath, bool overwrite = true)
{
using (var fs = new FileStream(filePath, overwrite ? FileMode.Create : FileMode.CreateNew, FileAccess.Write))
{
var serializer = new XmlSerializer(typeof(T));
var ns = new XmlSerializerNamespaces();
ns.Add("", ""); // Omits xmlns:xsi/xmlns:xsd
try
{
serializer.Serialize(fs, t, ns);
}
catch (System.Exception)
{
if (File.Exists(filePath))
File.Delete(filePath);
throw;
}
}
}
例:
XML:
<Names>
<Names>John</Names>
<Names>Doe</Names>
<Names>Martin</Names>
<Names>Looter</Names>
</Names>
C#:
public class Configuration
{
[XmlArray("Names")]
[XmlArrayItem("Names")]
public List<string> Names { get; set; }
public Load(Stream stream)
{
var xmlSerializer = new XmlSerializer(typeof(Configuration));
var config = (Configuration)xmlSerializer.Deserialize(stream);
return config;
}
}
使用config.Names