如何在 .net core 的返回 xml 中删除 xmlns:xsi 和 xmlns:xsd？

Question

这是我的代码：

[HttpPost]
[Produces("application/xml")]
public async Task<xml> mp([FromBody]xml XmlData)
{
    xml ReturnXmlData = null;
    ReturnXmlData = new xml()
    {
        ToUserName = XmlData.FromUserName,
        FromUserName = XmlData.ToUserName,
        CreateTime = XmlData.CreateTime,
        MsgType = "text",
        Content = "Hello world"
    };
    return ReturnXmlData;
}
[XmlRoot("xml")]
public class xml
{
    public string ToUserName { get; set; }
    public string FromUserName { get; set; }
    public string CreateTime { get; set; }
    public string MsgType { get; set; }
    public string MsgId { get; set; }
    public string Content { get; set; }
}

现在，在我将这些代码发布到本地服务器进行测试之后：

<xml>
  <ToUserName>123</ToUserName>
  <FromUserName>45</FromUserName>
  <CreateTime>12345678</CreateTime>
  <MsgType>text</MsgType>
  <Content>greating</Content>
</xml>

然后它会返回这些：

<xml xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <ToUserName>45</ToUserName>
  <FromUserName>123</FromUserName>
  <CreateTime>20190921203758</CreateTime>
  <MsgType>text</MsgType>
  <Content>Hello world</Content>
</xml>

嗯，如你所见。XML 数据包含远程服务器中不允许的 xmlns:xsi 和 xmlns:xsd。

此外，远程服务器不受我们控制，我无法更改任何代码或任何规则。

这意味着我必须像这样修改返回的 XML：

<xml>
  <ToUserName>45</ToUserName>
  <FromUserName>123</FromUserName>
  <CreateTime>20190921203758</CreateTime>
  <MsgType>text</MsgType>
  <Content>Hello world</Content>
</xml>

返回 XML 时如何删除 xmlns:xsi 和 xmlns:xsd？谢谢你。

Answer 1

您可以为 xml 创建自定义序列化程序格式化程序，并且可以从默认XmlSerializerOutputFormatter实现继承它

public class XmlSerializerOutputFormatterNamespace : XmlSerializerOutputFormatter
{
    protected override void Serialize(XmlSerializer xmlSerializer, XmlWriter xmlWriter, object value)
    {
        //applying "empty" namespace will produce no namespaces
        var emptyNamespaces = new XmlSerializerNamespaces();
        emptyNamespaces.Add("", "any-non-empty-string");
        xmlSerializer.Serialize(xmlWriter, value, emptyNamespaces);
    }
}

添加此格式化程序 Startup

services
    .AddMvc(options =>
    {
        options.OutputFormatters.Add(new XmlSerializerOutputFormatterNamespace());
    })
    //there should be one of the following lines in your application already in order to make xml serialization work
    //our custom output formatter will override default one since it's iterated earlier in OutputFormatters collection
    .AddXmlSerializerFormatters()
    //.AddXmlDataContractSerializerFormatters()