Question

在下面的代码中我想为xml设置“standalone = yes”，我该怎么做？

Dim settings As New Xml.XmlWriterSettings
settings.Encoding = encoding

Using stream As New IO.MemoryStream, xtWriter As Xml.XmlWriter = _
    Xml.XmlWriter.Create(stream, settings)
    serializer.Serialize(xtWriter, obj)
    Return encoding.GetString(stream.ToArray())
End Using

例如，我有这个：

<?xml version="1.0" encoding="utf-8"?>

但我想要这个：

<?xml version="1.0" encoding="utf-8" standalone="yes"?>

Answer 1

我找到了一种更优雅的方法：只需在setTabWidget实例上调用WriteStartDocument(true) - 此代码序列化XmlWriter并将生成的XML输出到控制台。

首先，如果您使用data，则需要稍微调整一下以强制使用UTF-8，但keep this in mind：

将XML文档序列化为.NET字符串时，编码必须设置为UTF-16。字符串在内部存储为UTF-16，因此这是唯一有意义的编码。如果要以不同的编码存储数据，则使用字节数组。

StringWriter

public sealed class Utf8StringWriter : StringWriter
{
    public override Encoding Encoding { get { return Encoding.UTF8; } }
}

using (var sw = new Utf8StringWriter()) using (var xw= XmlWriter.Create(sw, new XmlWriterSettings{Indent = true})) { xw.WriteStartDocument(true); // that bool parameter is called "standalone" var namespaces = new XmlSerializerNamespaces(); namespaces.Add(string.Empty, string.Empty); var xmlSerializer = new XmlSerializer(typeof(data)); xmlSerializer.Serialize(xw, data); Console.WriteLine(sw.ToString()); }真的感觉像指定WriteStartDocument(true)的惯用方式。输出标题如下所示：

standalone=true

Answer 2

如果你想这样做，那么你需要使用WriteProcessingInstruction方法并手动写出来。

    Using stream As New IO.MemoryStream, xtWriter As Xml.XmlWriter = Xml.XmlWriter.Create(stream, settings)
        xtWriter.WriteProcessingInstruction("xml", "version=""1.0"" encoding=""UTF-8"" standalone=""yes""")
        serializer.Serialize(xtWriter, obj)
        Return encoding.GetString(stream.ToArray())
    End Using

在序列化对象时，在.Net中设置StandAlone = Yes

2 个答案: