如何以编程方式修改app.config中的assemblyBinding？

Question

我试图通过使用XmlDocument类并直接修改值来在安装时更改bindingRedirect元素.这是我的app.config看起来像:

<configuration>
    <configSections>
        <sectionGroup name="applicationSettings" type="System.Configuration.ApplicationSettingsGroup, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">            
            ...
        </sectionGroup>      
    </configSections>
    <runtime>
      <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
        <dependentAssembly>
          <assemblyIdentity name="MyDll" publicKeyToken="31bfe856bd364e35"/>
          <bindingRedirect oldVersion="0.7" newVersion="1.0"/>
        </dependentAssembly>
     </assemblyBinding>
    </runtime>    
...
</configuration>

然后我尝试使用以下代码将1.0更改为2.0

private void SetRuntimeBinding(string path, string value)
{
    XmlDocument xml = new XmlDocument();

    xml.Load(Path.Combine(path, "MyApp.exe.config"));
    XmlNode root = xml.DocumentElement;

    if (root == null)
    {
        return;
    }

    XmlNode node = root.SelectSingleNode("/configuration/runtime/assemblyBinding/dependentAssembly/bindingRedirect/@newVersion");

    if (node == null)
    {
        throw (new Exception("not found"));
    }

    node.Value = value;

    xml.Save(Path.Combine(path, "MyApp.exe.config"));
}

但是,它会引发"未找到"的异常.如果我将路径备份到/ configuration/runtime它就可以了.但是,一旦我添加了assemblyBinding,它就找不到该节点.可能这与xmlns有关吗？知道怎么修改这个吗？ConfigurationManager也无权访问此部分.

Answer 1

我找到了我需要的东西.由于assemblyBinding节点包含xmlns属性,因此需要XmlNamespaceManager.我修改了代码以使用它并且它可以工作:

    private void SetRuntimeBinding(string path, string value)
    {
        XmlDocument doc = new XmlDocument();

        try
        {
            doc.Load(Path.Combine(path, "MyApp.exe.config"));
        }
        catch (FileNotFoundException)
        {
            return;
        }

        XmlNamespaceManager manager = new XmlNamespaceManager(doc.NameTable);
        manager.AddNamespace("bindings", "urn:schemas-microsoft-com:asm.v1");

        XmlNode root = doc.DocumentElement;

        XmlNode node = root.SelectSingleNode("//bindings:bindingRedirect", manager);

        if (node == null)
        {
            throw (new Exception("Invalid Configuration File"));
        }

        node = node.SelectSingleNode("@newVersion");

        if (node == null)
        {
            throw (new Exception("Invalid Configuration File"));
        }

        node.Value = value;

        doc.Save(Path.Combine(path, "MyApp.exe.config"));
    }

Answer 2

听起来像是你有你的配置文件调整现在的工作,但我想你可能仍然感兴趣的是如何在运行时调整绑定重定向.关键是使用AppDomain.AssemblyResolve事件,详细信息在此答案中.我更喜欢使用配置文件,因为我的版本号比较可能会更复杂,我不必在每次构建期间调整配置文件.