动态加载的程序集的应用程序配置 [英] App config for dynamically loaded assemblies

问题描述

我正在尝试将模块动态加载到我的应用程序中，但是我想为每个模块分别指定单独的app.config文件.

I'm trying to load modules into my application dynamically, but I want to specify separate app.config files for each one.

说我对主应用程序有以下app.config设置:

Say I have following app.config setting for main app:

<appSettings>
  <add key="House" value="Stark"/>
  <add key="Motto" value="Winter is coming."/>
</appSettings>

另外一个我使用Assembly.LoadFrom加载的库:

And another for library that I load using Assembly.LoadFrom:

<appSettings>
  <add key="House" value="Lannister"/>
  <add key="Motto" value="Hear me roar!"/>
</appSettings>

两个库都有一个使用以下方法实现相同接口的类:

Both libraries have a class implementing the same interface, with the following method:

public string Name
{
    get { return ConfigurationManager.AppSettings["House"]; }
}

请确保从主类和已加载的程序集输出Stark都对Name进行了足够的调用.

And sure enough calls to Name from both main class and loaded assembly class output Stark.

是否有一种方法可以使主应用程序使用其自己的app.config，而每个加载的程序集都使用其主程序?配置文件的名称在输出中是不同的，所以我认为应该是可能的.

Is there a way to make main app use its own app.config and each loaded assembly use theirs? Names of config files are different in the output, so that should be possible I think.

推荐答案

好，这是我最终得到的简单解决方案: 在实用程序库中创建关注函数:

Ok, here's the simple solution I ended up with: Create the follow function in the utility library:

public static Configuration LoadConfig()
{
    Assembly currentAssembly = Assembly.GetCallingAssembly();
    return ConfigurationManager.OpenExeConfiguration(currentAssembly.Location);
}

在动态加载的库中使用它，如下所示:

Using it in dynamically loaded libraries like this:

private static readonly Configuration Config = ConfigHelpers.LoadConfig();

无论该库如何加载，它都会使用正确的配置文件.

No matter how that library gets loaded it uses the correct config file.

对于将文件加载到ASP.NET应用程序中，这可能是更好的解决方案:

This might be the better solution for loading files into ASP.NET applications:

public static Configuration LoadConfig()
{
    Assembly currentAssembly = Assembly.GetCallingAssembly();
    string configPath = new Uri(currentAssembly.CodeBase).LocalPath;
    return ConfigurationManager.OpenExeConfiguration(configPath);
}

要在构建后复制文件，您可能需要将以下行添加到asp应用程序的构建后事件中(从库中提取配置):

To copy file after build you might want to add the following line to post-build events for asp app (pulling the config from library):

copy "$(SolutionDir)<YourLibProjectName>\$(OutDir)$(Configuration)\<YourLibProjectName>.dll.config" "$(ProjectDir)$(OutDir)"

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