[英]C# XmlWriter namespace issues
I'm using XmlWriter
and I'm struggling to create the following XML tag. 我正在使用
XmlWriter
,正在努力创建以下XML标签。
<mzML xmlns="http://psi.hupo.org/ms/mzml" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://psi.hupo.org/ms/mzml http://psidev.info/files/ms/mzML/xsd/mzML1.1.0_idx.xsd" version="1.1">
I have the following: 我有以下几点:
XmlWriterSettings settings = new XmlWriterSettings();
settings.Indent = true;
XmlWriter xmlWriter = XmlWriter.Create(xmlFilePath, settings);
xmlWriter.WriteStartDocument();
xmlWriter.WriteStartElement("mzML", "xmlns", @"http://psi.hupo.org/ms/mzml");
xmlWriter.WriteAttributeString("xsi", "xmlns", @"http://www.w3.org/2001/XMLSchema-instance");
xmlWriter.WriteAttributeString("schemaLocation", "xsi", @"http://psi.hupo.org/ms/mzml http://psidev.info/files/ms/mzML/xsd/mzML1.1.0.xsd");
xmlWriter.WriteAttributeString("version", "1.1");
xmlWriter.WriteEndElement();
xmlWriter.WriteEndDocument();
xmlWriter.Close();
which results in the following: 结果如下:
<mzML:xmlns p1:xsi="http://www.w3.org/2001/XMLSchema-instance" p2:schemaLocation="http://psi.hupo.org/ms/mzml http://psidev.info/files/ms/mzML/xsd/mzML1.1.0.xsd" version="1.1.0" xmlns:p2="xsi" xmlns:p1="xmlns" xmlns:mzML="http://psi.hupo.org/ms/mzml">
The documentation is confusing me; 该文档使我感到困惑。 I've tried lots of variations of the above code but can't seem to get anywhere close to my target XML tag.
我已经尝试了上述代码的许多变体,但似乎无法达到我的目标XML标签的任何地方。
Can anybody please help? 有人可以帮忙吗?
(PS I need to use XmlWriter
due to the size of the XML files I need to create.) (由于我需要创建XML文件的大小,因此我需要使用
XmlWriter
。)
This seems quite confused. 这似乎很困惑。 If we go through each line in turn:
如果我们依次浏览每一行:
xmlWriter.WriteStartElement("mzML", "xmlns", @"http://psi.hupo.org/ms/mzml");
This specifies your element has the prefix mzML
and the local name xmlns
and the namespace of http://...
. 这指定您的元素具有前缀
mzML
和本地名称xmlns
以及http://...
的名称空间。 Your element has no prefix, and the local name should be mzML
. 您的元素没有前缀, 本地名称应为
mzML
。
xmlWriter.WriteAttributeString("xsi", "xmlns",
@"http://www.w3.org/2001/XMLSchema-instance");
This writes an attribute with the prefix xsi
and the namespace xmlns
. 这将写入带有前缀
xsi
和名称空间xmlns
的属性。 This is a namespace declaration: it has a prefix of xmlns
, a local name of xsi
and the namespace should be null
. 这是一个名称空间声明:它具有
xmlns
前缀,本地名称xsi
并且名称空间应为null
。 I'd also note that the writing of namespace declaration attributes will be automatically handled by XmlWriter
- you'd generally only write them explicitly if you wanted to control which element they occur in and/or in what order. 我还要注意,命名空间声明属性的编写将由
XmlWriter
自动处理-通常,如果要控制它们以什么元素和/或以什么顺序发生,通常只应明确地编写它们。
xmlWriter.WriteAttributeString("schemaLocation", "xsi",
@"http://psi.hupo.org/ms/mzml http://psidev.info/files/ms/mzML/xsd/mzML1.1.0.xsd");
This writes an attribute with the name schemaLocation
(correct) and the namespace xsi
. 这将写入名称为
schemaLocation
(正确)和名称空间xsi
的属性。 This is not correct, the namespace is http://www.w3.org/2001/XMLSchema-instance
. 这是不正确的,名称空间是
http://www.w3.org/2001/XMLSchema-instance
。
xmlWriter.WriteAttributeString("version", "1.1");
This is correct. 这是对的。
Putting all of these changes together: 将所有这些更改放在一起:
xmlWriter.WriteStartElement("mzML", @"http://psi.hupo.org/ms/mzml");
// these two lines are optional - the namespace declarations are
// automatically inserted as the *last* attributes when omitted
xmlWriter.WriteAttributeString("xmlns", null, null, "http://psi.hupo.org/ms/mzml");
xmlWriter.WriteAttributeString("xmlns", "xsi", null,
"http://www.w3.org/2001/XMLSchema-instance");
xmlWriter.WriteAttributeString("xsi", "schemaLocation",
"http://www.w3.org/2001/XMLSchema-instance",
"http://psi.hupo.org/ms/mzml http://psidev.info/files/ms/mzML/xsd/mzML1.1.0.xsd");
xmlWriter.WriteAttributeString("version", "1.1");
See this fiddle for a working demo. 请参阅此小提琴以获得有效的演示。 This leaves out the optional namespace declaration attributes to show they still get added.
这省去了可选的名称空间声明属性,以显示它们仍然被添加。
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