如何使xmlserialiser不以<开头?XML?>?

不太难,只需序列化为显式声明的xmlwriter,并在序列化之前设置该writer上的选项。

public static string SerializeExplicit(SomeObject obj)
{    
    XmlWriterSettings settings;
    settings = new XmlWriterSettings();
    settings.OmitXmlDeclaration = true;

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


    XmlSerializer serializer;
    serializer = new XmlSerializer(typeof(SomeObject));

    //Or, you can pass a stream in to this function and serialize to it.
    // or a file, or whatever - this just returns the string for demo purposes.
    StringBuilder sb = new StringBuilder();
    using(var xwriter = XmlWriter.Create(sb, settings))
    {

        serializer.Serialize(xwriter, obj, ns);
        return sb.ToString();
    }
}

在调用 Serialize 方法。它的 Settings 财产有 OmitXmlDeclaration 属性,您将要将其设置为true。你还需要设置 ConformanceLevel 属性,否则XmlWriter将忽略 省略xmlDeclaration 财产。

XmlWriterSettings settings = new XmlWriterSettings();
settings.OmitXmlDeclaration = true;
settings.ConformanceLevel = ConformanceLevel.Fragment;
XmlWriter writer = XmlWriter.Create(/*whatever stream you need*/,settings);
serializer.Serialize(writer,objectToSerialize);
writer.close();