如何以编程方式修改app.config中的assemblyBinding？ [英] How to programmatically modify assemblyBinding in app.config?

问题描述

我试图在安装时通过使用XmlDocument类并直接修改值来更改bindingRedirect元素。这是我的app.config样子：

I am trying to change the bindingRedirect element at install time by using the XmlDocument class and modifying the value directly. Here is what my app.config looks like:

<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

I then try to use the following code to change 1.0 to 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，它会引发未找到异常。如果我将路径备份到/ configuration / runtime，那么它将起作用。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？知道我该如何修改吗？ ConfigurationManager也无权访问此部分。

However, it throws the 'not found' exception. If I back the path up to /configuration/runtime it works. However once I add assemblyBinding, it does not find the node. Possibly this has something to do with the xmlns? Any idea how I can modify this? ConfigurationManager also does not have access to this section.

推荐答案

我找到了所需的内容。 XmlNamespaceManager是必需的，因为assemblyBinding节点包含xmlns属性。我修改了代码以使用此代码，它可以正常工作：

I found what I needed. The XmlNamespaceManager is required as the assemblyBinding node contains the xmlns attribute. I modified the code to use this and it works:

    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"));
    }

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