我无法使用 XElement 获取 <pmlcore:Sensor

I can't get <pmlcore:Sensor with XElement

我正在使用 .NET Framework 4.5.1 开发 ASP.NET MVC 应用程序,returns XML 从数据库数据生成。

我想获得这个:

<?xml version="1.0" encoding="utf-8"?>
<pmlcore:Sensor [ Ommitted for brevety ] ">

但我明白了:

<?xml version="1.0" encoding="utf-8"?>
<Sensor [ Ommitted for brevety ]  xmlns="pmlcore">

阅读了在 Whosebug 中找到的所有答案,我更改了我的代码以使用 XNamespace:

XNamespace ns = "http://www.w3.org/2001/XMLSchema-instance";
XDeclaration dec = new XDeclaration("1.0", "utf-8", null);

XNamespace pmlcore = "pmlcore";
XNamespace pmluid = "pmluid";

root = new XElement(pmlcore + "Sensor"
    , new XAttribute(XNamespace.Xmlns + "pmluid", 
        "urn:autoid:specification:universal:Identifier:xml:schema:1")
    , new XAttribute(XNamespace.Xmlns + "xsi", ns)
    , new XAttribute(XNamespace.Xmlns + "pmlcore", 
        "urn:autoid:specification:interchange:PMLCore:xml:schema:1")
    , new XAttribute(ns + "noNamespaceSchemaLocation",
                     "urn:autoid:specification:interchange:PMLCore:xml:schema:1 ./PML/SchemaFiles/Interchange/PMLCore.xsd")

如何获得<pmlcore:Sensor这个?

如果我使用此代码:

root = new XElement("pmlcore:Sensor"

我收到这个错误:

The ':' character, hexadecimal value 0x3A, cannot be included in a name

问题是您添加了错误的命名空间...您正在尝试为其使用 别名,而不是命名空间 URI。这是一个有效的具体示例:

using System;
using System.Xml.Linq;

class Program
{
    static void Main(string[] args)
    {
        XNamespace pmlcore = "urn:autoid:specification:interchange:PMLCore:xml:schema:1";
        XNamespace pmluid = "urn:autoid:specification:universal:Identifier:xml:schema:1";

        var root = new XElement(pmlcore + "Sensor",
             new XAttribute(XNamespace.Xmlns + "pmluid", pmluid.NamespaceName),
             new XAttribute(XNamespace.Xmlns + "pmlcore", pmlcore.NamespaceName));
        Console.WriteLine(root);
    }
}

输出(重新格式化):

<pmlcore:Sensor
  xmlns:pmluid="urn:autoid:specification:universal:Identifier:xml:schema:1"
  xmlns:pmlcore="urn:autoid:specification:interchange:PMLCore:xml:schema:1" />