C# 如何以编程方式修改 app.config 中的 assemblyBinding？
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How to programmatically modify assemblyBinding in app.config?
提问by esac
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:
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 的样子：
<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>
I then try to use the following code to change 1.0 to 2.0
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"));
}
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.
但是，它会引发“未找到”异常。如果我将路径备份到 /configuration/runtime ，它就可以工作。但是，一旦我添加了 assemblyBinding，它就找不到节点。可能这与xmlns有关？知道如何修改它吗？ConfigurationManager 也无权访问此部分。
采纳答案by esac
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:
我找到了我需要的东西。XmlNamespaceManager 是必需的，因为 assemblyBinding 节点包含 xmlns 属性。我修改了代码以使用它并且它有效：
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"));
}
回答by Joe
I think the right Xpath syntax is:
我认为正确的 Xpath 语法是：
/configuration/runtime/assemblyBinding/dependentAssembly/bindingRedirect@newVersion
/configuration/runtime/assemblyBinding/dependentAssembly/bindingRedirect@newVersion
(you have a slash too many).
（你的斜线太多了）。
Or if this doesn't work you could select the bindingRedirect element (using SelectSingleNode):
或者，如果这不起作用，您可以选择 bindingRedirect 元素（使用 SelectSingleNode）：
/configuration/runtime/assemblyBinding/dependentAssembly/bindingRedirect
/configuration/runtime/assemblyBinding/dependentAssembly/bindingRedirect
Then modify the attribute newVersion of this element.
然后修改这个元素的属性newVersion。
回答by Don Kirkby
Sounds like you've got your configuration file tweak working now, but I thought you might still be interested in how to adjust binding redirects at run time. The key is to use the AppDomain.AssemblyResolveevent, and the details are in this answer. I prefer it over using the configuration file, because my version number comparison can be a bit more sophisticated and I don't have to tweak the configuration file during every build.
听起来您现在已经调整了配置文件，但我认为您可能仍然对如何在运行时调整绑定重定向感兴趣。关键是使用AppDomain.AssemblyResolve事件，详细信息在这个答案中。我更喜欢它而不是使用配置文件，因为我的版本号比较可能更复杂一些，而且我不必在每次构建期间调整配置文件。
