如何添加一个命名空间，在做XmlSerialization用的XmlWriter？ [英] How do I add a namespace while doing XmlSerialization with an XmlWriter?

问题描述

我使用的与XML序列化相结合的的XmlWriter。我能够输出XML很好，但如何将xmlns属性与的XmlWriter似乎是逃避我。

要写出我用下面的文件的开头：

  Writer.WriteStartDocument（）;
    Writer.WriteStartElement（urlset，http://www.sitemaps.org/schemas/sitemap/0.9）;
 

随着我的XmlWriter通过SitemapNodes创建我然后循环我已经创造了他们，并通过序列化这样写到底层StringBuilder的：

 的foreach（在列表uk.co.andrewrea.SitemapNode节点）
    {
        Serializer.Serialize（作家，节点）;
    }
 

正如我说，这工作正常，但不包括根元素上面的命名空间。每次我试着写物理属性，XMLNS，我得到一个异常的的xmlns由系统对XML的使用而保留的，所以基本上无法使用。

我知道如何使用XmlTextWriter对象，并使用XmlDocument类要做到这一点，但我需要了解我是如何使用的XmlWriter，并通过序列化实现这一目标。

下面的尝试也抛出异常有关的命名空间被保留。

 的foreach（在列表uk.co.andrewrea.SitemapNode节点）
{
      XmlSerializerNamespaces NS =新XmlSerializerNamespaces（）;
      ns.Add（的xmlns，http://www.sitemaps.org/schemas/sitemap/0.9）;

      Serializer.Serialize（作家，节点，NS）;
}

异常详细信息：System.ArgumentException：preFIX的xmlns是由XML保留。
 

解决方案

您可以添加命名空间到XmlSerialization属性，如：

  [的XmlElement（
的ElementName =成员，
命名空间=htt​​p://www.cpandl.com）]
公务员[]员工;
 

如果您在code控制。

I am using the XmlWriter in conjunction with Xml Serialization. I am able to output the XML fine, but how to include the xmlns attribute with the XmlWriter seems to be escaping me.

To write the start of the document I use the following:

    Writer.WriteStartDocument();
    Writer.WriteStartElement("urlset","http://www.sitemaps.org/schemas/sitemap/0.9");

With my XmlWriter created I then loop through SitemapNodes I have created them and write them to the underlying stringbuilder through serialization like this:

    foreach (uk.co.andrewrea.SitemapNode node in List)
    {
        Serializer.Serialize(Writer, node);
    }

As I say this works fine BUT the above namespace for the root element is not included. Every time I try to physically write the attribute, xmlns, I get an exception that the xmlns is reserved by the system for XML use, so basically I cannot use.

I know how to do this using the XmlTextWriter and also using the XmlDocument class but i need to understand how I achieve this using the XmlWriter and through Serialization.

The following attempt also throws the exception about that namespace being reserved.

foreach (uk.co.andrewrea.SitemapNode node in List)
{
      XmlSerializerNamespaces ns = new XmlSerializerNamespaces();
      ns.Add("xmlns", "http://www.sitemaps.org/schemas/sitemap/0.9");

      Serializer.Serialize(Writer, node, ns);
}

Exception Details: System.ArgumentException: Prefix "xmlns" is reserved for use by XML.

解决方案

You can add the namespace to the XmlSerialization attributes, e.g.:

[XmlElement(
ElementName = "Members",
Namespace = "http://www.cpandl.com")]
public Employee[] Employees;

if you have control over the code.

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