C#XML - 使用XML Writer进行多命名空间声明

Question

我正在尝试使用C#中的System.Xml.Xmlwriter创建具有多个名称空间的XML文档,并在编译时收到以下错误:

在同一个开始元素标记内,前缀''无法从''重新定义为'http://www.acme.com/BOF'.

我的全部代码如下:

        XmlWriterSettings settings = new XmlWriterSettings { Encoding = Encoding.UTF8, Indent = true };

        XmlWriter writer = XmlWriter.Create("C:\\ACME\\xml.xml", settings);

        writer.WriteStartDocument();

        writer.WriteStartElement("BOF");
        writer.WriteAttributeString("xmlns", null, null, "http://www.acme.com/BOF");  //This is where I get my error
        writer.WriteAttributeString("xmlns", "xsi", null, "http://www.w3.org/2001/XMLSchema-instance");
        writer.WriteAttributeString("fileName", null, null, "test.xml");
        writer.WriteAttributeString("date", null, null, "2011-10-25");
        writer.WriteAttributeString("origin", null, null, "MYORIGIN");
        writer.WriteAttributeString("ref", null, null, "XX_88888");
        writer.WriteEndElement();

        writer.WriteStartElement("CustomerNo");
        writer.WriteString("12345");
        writer.WriteEndElement();

        writer.WriteEndDocument();

        writer.Flush();
        writer.Close();

我究竟做错了什么？

谢谢

约翰

Answer 1

writer.WriteStartElement("BOF"); // write element name BOF, no prefix, namespace ""
writer.WriteAttributeString("xmlns", null, null, "http://www.acme.com/BOF");  //Set namespace for no prefix to "http://www.acme.com/BOF".

第二行是没有意义的,因为你将默认(无前缀)命名空间分配给不同于它的东西,在它的同一个地方.

用这两行代替 writer.WriteStartElement("BOF", "http://www.acme.com/BOF")