C# 如何更改属性的值？

在过去的几天里，我试图更改此应用程序文件的单个属性的值

Xml文件：

<?xml version="1.0" encoding="utf-8"?>
<asmv1:assembly xsi:schemaLocation="urn:schemas-microsoft-com:asm.v1 assembly.adaptive.xsd"
manifestVersion="1.0" xmlns:asmv1="urn:schemas-microsoft-com:asm.v1"
xmlns="urn:schemas-microsoft-com:asm.v2"
xmlns:asmv2="urn:schemas-microsoft-com:asm.v2"
xmlns:xrml="urn:mpeg:mpeg21:2003:01-REL-R-NS" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:asmv3="urn:schemas-microsoft-com:asm.v3" 
xmlns:dsig="http://www.w3.org/2000/09/xmldsig#"
xmlns:co.v1="urn:schemas-microsoft-com:clickonce.v1"
xmlns:co.v2="urn:schemas-microsoft-com:clickonce.v2">
 <assemblyIdentity name="lolz" version="1.1.1.1" publicKeyToken="12345" language="neutral" processorArchitecture="x86" xmlns="urn:schemas-microsoft-com:asm.v1" />
  <description asmv2:publisher="Example" asmv2:product="Productexample2" asmv2:supportUrl="Example" xmlns="urn:schemas-microsoft-com:asm.v1" />
  <deployment install="true" mapFileExtensions="true" minimumRequiredVersion="1.1.1.1" trustURLParameters="true">
   <subscription>
     <update>
        <beforeApplicationStartup />
      </update>
    </subscription>
     <deploymentProvider codebase="http://Test" />
   </deployment>  
</asmv1:assembly>

但它抛出异常“System.Xml.XPath.XPathException”类型的未处理异常发生在System.Xml.dll中，因此我认为asmv1:assembly/description/asmv2:product是错误的

对代码有什么建议吗

---

像往常一样，您可以用任何方式纠正我：

您必须使用名称空间管理器使前缀工作，并且您需要@字符来指示它是您正在引用的属性

因此，这应该是可行的：

XmlNamespaceManager manager = new XmlNamespaceManager(xmlDoc.NameTable);
manager.AddNamespace("asmv1", "urn:schemas-microsoft-com:asm.v1");
manager.AddNamespace("asmv2", "urn:schemas-microsoft-com:asm.v2");
XmlNode node = xmlDoc.SelectSingleNode("/asmv1:assembly/asmv1:description/@asmv2:product", manager);

此外，XML根目录中的第一行不完整。应该是：

<asmv1:assembly xsi:schemaLocation="urn:schemas-microsoft-com:asm.v1 assembly.adaptive.xsd"
                manifestVersion="1.0"
                xmlns:asmv1="urn:schemas-microsoft-com:asm.v1"
                xmlns="urn:schemas-microsoft-com:asm.v2"
                xmlns:asmv2="urn:schemas-microsoft-com:asm.v2"
                xmlns:xrml="urn:mpeg:mpeg21:2003:01-REL-R-NS"
                xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                xmlns:asmv3="urn:schemas-microsoft-com:asm.v3"
                xmlns:dsig="http://www.w3.org/2000/09/xmldsig#"
                xmlns:co.v1="urn:schemas-microsoft-com:clickonce.v1"
                xmlns:co.v2="urn:schemas-microsoft-com:clickonce.v2"
>

---

这是有效的xml吗？我知道“asmv1”是一个未声明的前缀。您是否错过了xmlns:asmv1=…？哦，很抱歉，我删除了一些名称空间：等等。仍然：System.Xml.XPath.XPathException类型的未处理异常发生在System.Xml.dll中，它表示此查询具有前缀、变量或用户定义的函数OK。我使用名称空间管理器修复了这个问题。请参阅更新。但实际结果仍然为空。在XmlNode=xmlDoc.SelectSingleNode/asmv1:assembly/description，manager；修好了。问题在于asmv1:description使用默认名称空间asmv1谢谢：does work:P，所以我想我应该在

<asmv1:assembly xsi:schemaLocation="urn:schemas-microsoft-com:asm.v1 assembly.adaptive.xsd"
                manifestVersion="1.0"
                xmlns:asmv1="urn:schemas-microsoft-com:asm.v1"
                xmlns="urn:schemas-microsoft-com:asm.v2"
                xmlns:asmv2="urn:schemas-microsoft-com:asm.v2"
                xmlns:xrml="urn:mpeg:mpeg21:2003:01-REL-R-NS"
                xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                xmlns:asmv3="urn:schemas-microsoft-com:asm.v3"
                xmlns:dsig="http://www.w3.org/2000/09/xmldsig#"
                xmlns:co.v1="urn:schemas-microsoft-com:clickonce.v1"
                xmlns:co.v2="urn:schemas-microsoft-com:clickonce.v2"
>