XmlSerializer更改编码

本文关键字：编码 XmlSerializer | 更新日期: 2023-09-27 17:50:32

我使用此代码Serialize XML到String:

XmlWriterSettings xmlWriterSettings = new XmlWriterSettings
{
    indent = true,
    Encoding = Encoding.UTF8
};
using (var sw = new StringWriter())
{
    using (XmlWriter xmlWriter = XmlWriter.Create(sw, xmlWriterSettings))
    {
        XmlSerializer xmlSerializer = new XmlSerializer(moviesObject.GetType(), new XmlRootAttribute("category"));
        xmlSerializer.Serialize(xmlWriter, moviesObject);
    }
    return sw.ToString();
}

问题是我得到:

<?xml version="1.0" encoding="utf-16"?>
<category xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" havemore="no">
  <items>
    <movie>
      <videoid>videoid1</videoid>
      <title>title1</title>
    </movie>
  </items>
</category>

有任何方法可以改变<?xml version="1.0" encoding="utf-16"?>来<?xml version="1.0" encoding="utf-8"?> ?

XmlSerializer更改编码

这是一个以encoding为参数的代码。请阅读为什么有一个SuppressMessage用于代码分析的评论。

/// <summary>
/// Serialize an object into an XML string
/// </summary>
/// <typeparam name="T">Type of object to serialize.</typeparam>
/// <param name="obj">Object to serialize.</param>
/// <param name="enc">Encoding of the serialized output.</param>
/// <returns>Serialized (xml) object.</returns>
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2202:Do not dispose objects multiple times")]
internal static String SerializeObject<T>(T obj, Encoding enc)
{
    using (MemoryStream ms = new MemoryStream())
    {
        XmlWriterSettings xmlWriterSettings = new System.Xml.XmlWriterSettings()
        {
            // If set to true XmlWriter would close MemoryStream automatically and using would then do double dispose
            // Code analysis does not understand that. That's why there is a suppress message.
            CloseOutput = false, 
            Encoding = enc,
            OmitXmlDeclaration = false,
            Indent = true
        };
        using (System.Xml.XmlWriter xw = System.Xml.XmlWriter.Create(ms, xmlWriterSettings))
        {
            XmlSerializer s = new XmlSerializer(typeof(T));
            s.Serialize(xw, obj);
        }
        return enc.GetString(ms.ToArray());
    }
}

试试这个

public static void SerializeXMLData(string pth, object xmlobj)
    {
        XmlSerializer serializer = new XmlSerializer(xmlobj.GetType());
        using (XmlTextWriter tw = new XmlTextWriter(pth, Encoding.UTF8))
        {
            tw.Formatting = Formatting.Indented;
            serializer.Serialize(tw, xmlobj);
        }
    }

解决方案很简单:
使用从StringWriter派生的StringWriter类，并在构造函数中设置编码，并覆盖基类的encoding属性:

public sealed class StringWriterWithEncoding : System.IO.StringWriter
{
    private readonly System.Text.Encoding encoding;
    public StringWriterWithEncoding(System.Text.StringBuilder sb) : base(sb)
    {
        this.encoding = System.Text.Encoding.Unicode;
    }

    public StringWriterWithEncoding(System.Text.Encoding encoding)
    {
        this.encoding = encoding;
    }
    public StringWriterWithEncoding(System.Text.StringBuilder sb, System.Text.Encoding encoding) : base(sb)
    {
        this.encoding = encoding;
    }
    public override System.Text.Encoding Encoding
    {
        get { return encoding; }
    }
}

然后将stringwriterwithencocoding的一个实例传递给你的方法:

public static string SerializeToXml<T>(T ThisTypeInstance)
{
    System.Text.StringBuilder sb = new System.Text.StringBuilder();
    string strReturnValue = null;
    //SerializeToXml<T>(ThisTypeInstance, new System.IO.StringWriter(sb));
    SerializeToXml<T>(ThisTypeInstance, new StringWriterWithEncoding(sb, System.Text.Encoding.UTF8));
    strReturnValue = sb.ToString();
    sb = null;
    return strReturnValue;
} // End Function SerializeToXml
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