C#中如何插入XML的命名空间

兔子-顾问 2014-11-21 01:51:06

我需要生成这样的XML数据：



<?xml version="1.0" encoding="utf-8" standalone="no"?>

<svg xmlns="http://www.w3.org/2000/svg" version="1.1">

  <line x1="0" y1="0" x2="200" y2="200" style="stroke:rgb(255,0,0);stroke-width:2" />

</svg>

我使用如下代码



XDocument document = new XDocument(new XDeclaration("1.0", "UTF-8", "no"));

XElement root = new XElement("svg");

root.Add(

    new XAttribute("width", this.Size.Width)

    , new XAttribute("height", this.Size.Height)

    , new XAttribute("viewBox", "0 0 " + this.Size.Width.ToString() + " " + this.Size.Height.ToString())

    , new XAttribute("xmlns", "http://www.w3.org/2000/svg")

    , new XAttribute("preserveAspectRatio", "xMidYMid"));

document.Add(root);

编译时正确，但运行时会有异常：
在同一开始元素标记中，无法将前缀“”从“”重定义为“http://www.w3.org/2000/svg”。

请教如何处理呢？一定要自己拼字符串么？

...全文

788 7 打赏收藏转发到动态举报

写回复

用AI写文章

7 条回复

切换为时间正序

请发表友善的回复…

发表回复

q107770540 2014-11-21

打赏
举报

	 XDocument document = new XDocument(new XDeclaration("1.0", "UTF-8", "no"));
	 XNamespace ns = "http://www.w3.org/2000/svg";  
	XElement root = new XElement(ns+"svg");
	root.Add(
		new XAttribute("width", 1)
		, new XAttribute("height", 2)
		, new XAttribute("viewBox", "0 0 " + 3)
		, new XAttribute("preserveAspectRatio", "xMidYMid"),
		 new XAttribute("xmlns", "http://www.w3.org/2000/svg"),
			new XElement( ns+"Child1", "child content"),
			new XElement( ns+"Child2", "child content")
			);
	    //Add element
		root.AddFirst(new XElement( ns+"Child0", "child content"));	
			
		document.Add(root);

q107770540 2014-11-21

打赏
举报

	 XDocument document = new XDocument(new XDeclaration("1.0", "UTF-8", "no"));
	 XNamespace ns = "http://www.w3.org/2000/svg";  
	XElement root = new XElement(ns+"svg");
	root.Add(
		new XAttribute("width", 1)
		, new XAttribute("height", 2)
		, new XAttribute("viewBox", "0 0 " + 3)
		, new XAttribute("preserveAspectRatio", "xMidYMid"),
		 new XAttribute("xmlns", "http://www.w3.org/2000/svg"),
			new XElement( ns+"Child1", "child content"),
			new XElement( ns+"Child2", "child content")
			);
	    //Add element
		root.AddFirst(new XElement( ns+"Child0", "child content"));	
			
		document.Add(root);

q107770540 2014-11-21

打赏
举报

引用 4 楼 wuyazhe 的回复:

#1，#2 插入的的确没问题了，不过子节点都会多一个属性：xmlns="" 这个固定多余的，能去掉么？

可以去掉的：

void Main()
{
	 XDocument document = new XDocument(new XDeclaration("1.0", "UTF-8", "no"));
	 XNamespace ns = "http://www.w3.org/2000/svg";  
	XElement root = new XElement(ns+"svg");
	root.Add(
		new XAttribute("width", 1)
		, new XAttribute("height", 2)
		, new XAttribute("viewBox", "0 0 " + 3)
		, new XAttribute("preserveAspectRatio", "xMidYMid"),
		 new XAttribute("xmlns", "http://www.w3.org/2000/svg"),
			new XElement( ns+"Child1", "child content"),
			new XElement( ns+"Child2", "child content")
			);
		document.Add(root);
		document.Save("d:\\test1.xml");
}

<?xml version="1.0" encoding="utf-8" standalone="no"?>
<svg width="1" height="2" viewBox="0 0 3" preserveAspectRatio="xMidYMid" xmlns="http://www.w3.org/2000/svg">
  <Child1>child content</Child1>
  <Child2>child content</Child2>
</svg>

兔子-顾问 2014-11-21

打赏
举报

#1，#2 插入的的确没问题了，不过子节点都会多一个属性：xmlns="" 这个固定多余的，能去掉么？

hb1122 2014-11-21

打赏
举报


            System.Xml.XmlDocument doc = new System.Xml.XmlDocument();
            System.Xml.XmlDeclaration declaration = doc.CreateXmlDeclaration("1.0", "UTF-8", "no");
            doc.AppendChild(declaration);
            System.Xml.XmlElement root = doc.CreateElement("svg", "http://www.w3.org/2000/svg");

            System.Xml.XmlElement line = doc.CreateElement("line", "http://www.w3.org/2000/svg");

            line.SetAttribute("x1","0");
            line.SetAttribute("y1","0");
            line.SetAttribute("x2","200");
            line.SetAttribute("y2","200");
            line.SetAttribute("style","stroke:rgb(255,0,0);stroke-width:2");
            doc.AppendChild(root);
            root.AppendChild(line);

exception92 2014-11-21

打赏
举报

http://msdn.microsoft.com/zh-cn/library/system.xml.linq.xnamespace(v=vs.110).aspx?cs-save-lang=1&cs-lang=csharp#code-snippet-2 要用到XNamespace类。

q107770540 2014-11-21

打赏
举报

用 XNamespace ns = "http://www.w3.org/2000/svg"; http://blog.csdn.net/q107770540/article/details/6117004

void Main()
{
	XDocument document = new XDocument(new XDeclaration("1.0", "UTF-8", "no"));
	 XNamespace ns = "http://www.w3.org/2000/svg";  
	XElement root = new XElement(ns+"svg");
	root.Add(
		new XAttribute("width", 1)
		, new XAttribute("height", 2)
		, new XAttribute("viewBox", "0 0 " + 3)
		
		, new XAttribute("preserveAspectRatio", "xMidYMid"));
		document.Add(root);
		document.Save("d:\\test.xml");
}