.net - 如何在不获取 xmlns="..." 的情况下将对象序列化为 XML？

Question

有没有办法让我在 .NET 中序列化对象，而 XML 命名空间也不会自动序列化？似乎默认情况下 .NET 认为应该包含 XSI 和 XSD 命名空间，但我不希望它们在那里。

Answer 1

啊……没关系。提出问题后的搜索总是会产生答案。我正在序列化的对象是obj并且已经被定义。将具有单个空命名空间的 XMLSerializerNamespace 添加到集合中就可以了。

在VB中是这样的：

Dim xs As New XmlSerializer(GetType(cEmploymentDetail))
Dim ns As New XmlSerializerNamespaces()
ns.Add("", "")

Dim settings As New XmlWriterSettings()
settings.OmitXmlDeclaration = True

Using ms As New MemoryStream(), _
    sw As XmlWriter = XmlWriter.Create(ms, settings), _
    sr As New StreamReader(ms)
    xs.Serialize(sw, obj, ns)
    ms.Position = 0
    Console.WriteLine(sr.ReadToEnd())
End Using

在 C# 中像这样：

//Create our own namespaces for the output
XmlSerializerNamespaces ns = new XmlSerializerNamespaces();

//Add an empty namespace and empty value
ns.Add("", "");

//Create the serializer
XmlSerializer slz = new XmlSerializer(someType);

//Serialize the object with our own namespaces (notice the overload)
slz.Serialize(myXmlTextWriter, someObject, ns);

Answer 2

如果您想摆脱多余的xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"and xmlns:xsd="http://www.w3.org/2001/XMLSchema"，但仍保留自己的命名空间xmlns="http://schemas.YourCompany.com/YourSchema/"，则使用与上面相同的代码，除了这个简单的更改：

//  Add lib namespace with empty prefix  
ns.Add("", "http://schemas.YourCompany.com/YourSchema/");   

Answer 3

如果您想删除命名空间，您可能还想删除版本，为了节省您的搜索，我添加了该功能，因此下面的代码将同时执行这两项操作。

我还将它包装在一个通用方法中，因为我正在创建非常大的 xml 文件，这些文件太大而无法在内存中序列化，因此我将输出文件分解并将其序列化为更小的“块”：

    public static string XmlSerialize<T>(T entity) where T : class
    {
        // removes version
        XmlWriterSettings settings = new XmlWriterSettings();
        settings.OmitXmlDeclaration = true;

        XmlSerializer xsSubmit = new XmlSerializer(typeof(T));
        using (StringWriter sw = new StringWriter())
        using (XmlWriter writer = XmlWriter.Create(sw, settings))
        {
            // removes namespace
            var xmlns = new XmlSerializerNamespaces();
            xmlns.Add(string.Empty, string.Empty);

            xsSubmit.Serialize(writer, entity, xmlns);
            return sw.ToString(); // Your XML
        }
    }

Answer 4

我建议这个助手类：

public static class Xml
{
    #region Fields

    private static readonly XmlWriterSettings WriterSettings = new XmlWriterSettings {OmitXmlDeclaration = true, Indent = true};
    private static readonly XmlSerializerNamespaces Namespaces = new XmlSerializerNamespaces(new[] {new XmlQualifiedName("", "")});

    #endregion

    #region Methods

    public static string Serialize(object obj)
    {
        if (obj == null)
        {
            return null;
        }

        return DoSerialize(obj);
    }

    private static string DoSerialize(object obj)
    {
        using (var ms = new MemoryStream())
        using (var writer = XmlWriter.Create(ms, WriterSettings))
        {
            var serializer = new XmlSerializer(obj.GetType());
            serializer.Serialize(writer, obj, Namespaces);
            return Encoding.UTF8.GetString(ms.ToArray());
        }
    }

    public static T Deserialize<T>(string data)
        where T : class
    {
        if (string.IsNullOrEmpty(data))
        {
            return null;
        }

        return DoDeserialize<T>(data);
    }

    private static T DoDeserialize<T>(string data) where T : class
    {
        using (var ms = new MemoryStream(Encoding.UTF8.GetBytes(data)))
        {
            var serializer = new XmlSerializer(typeof (T));
            return (T) serializer.Deserialize(ms);
        }
    }

    #endregion
}

:)

Answer 5

如果您无法摆脱每个元素的额外 xmlns 属性，则在从生成的类序列化为 xml 时（例如：使用xsd.exe时），那么您有类似的东西：

<manyElementWith xmlns="urn:names:specification:schema:xsd:one" />

然后我会和你分享对我有用的东西（以前的答案和我在这里找到的混合）

显式设置所有不同的 xmlns，如下所示：

Dim xmlns = New XmlSerializerNamespaces()
xmlns.Add("one", "urn:names:specification:schema:xsd:one")
xmlns.Add("two",  "urn:names:specification:schema:xsd:two")
xmlns.Add("three",  "urn:names:specification:schema:xsd:three")

然后将其传递给序列化

serializer.Serialize(writer, object, xmlns);

您将在根元素中声明三个命名空间，并且不再需要在其他元素中生成相应的前缀

<root xmlns:one="urn:names:specification:schema:xsd:one" ... />
   <one:Element />
   <two:ElementFromAnotherNameSpace /> ...

Answer 6

        XmlWriterSettings settings = new XmlWriterSettings
        {
            OmitXmlDeclaration = true
        };

        XmlSerializerNamespaces ns = new XmlSerializerNamespaces();
        ns.Add("", "");

        StringBuilder sb = new StringBuilder();

        XmlSerializer xs = new XmlSerializer(typeof(BankingDetails));

        using (XmlWriter xw = XmlWriter.Create(sb, settings))
        {
            xs.Serialize(xw, model, ns);
            xw.Flush();
            return sb.ToString();
        }