/// <summary>
/// 将对象Xml序列化成字节数组【Btye[]】，可自定义命名空间，可设置写入器配置
/// </summary>
/// <typeparam name="T">要序列化的对象类型</typeparam>
/// <param name="value">要序列化的对象</param>
/// <param name="namespaces">要添加的命名空间集合，如 xmlns:xsi="xxx"，【xsi】Key为[前缀]，【xxx】Value为[值]</param>
/// <param name="settings">Xml写入器配置</param>
/// <returns></returns>
public static byte[] ToXmlBytes <T>(this T value, IEnumerable <KeyValuePair <string, string> > namespaces, XmlWriterSettings settings = null) where T : class, new()
{
using MemoryStream stream = new MemoryStream();
using (XmlWriter xmlWriter = settings.IsNull() ? XmlWriter.Create(stream) : XmlWriter.Create(stream, settings))
{
XmlSerializerNamespaces ns = new XmlSerializerNamespaces();
if (namespaces?.Count() > 0)
{
foreach (var item in namespaces)
{
ns.Add(item.Key, item.Value);//添加前缀和命名空间值，如 xmlns:xsi="xxx"，【xsi】为前缀，【xxx】为值
}
}
new XmlSerializer(typeof(T)).Serialize(xmlWriter, value, ns);//序列化对象
}
return(stream.ToArray());
}
