C＃：管理多个App.config文件

Question

I am facing a problem.

I have a dll which is interacting with a webservice and it saves its endpoint configuration in its app.config file.

I want to use this dll from my host application. The host application has its own config file. I have to merge the contents of dll's config to host's config each time when I change service endpoint.

Is there a way that I can use both config files. So the dll uses its own config whereas host application use its own config.

Answer 1

config files can include external files.

If you'd put the endpoint's config onto an external file, and then include it in yout host, you won't need to change the host's config every time

eg: in your app.config file:

...
<configSections>
  ...
  <section name="myEndpoint" type="System.Configuration.DictionarySectionHandler" />
  ...
</configSections>
...
<myEndpoint configSource="myEndpoint.config" />

then myEndpoint.config could look like that:

<?xml version="1.0" encoding="utf-8"?>
<myEndpoint>
  <add key="myKey" value="myValue" />
</myEndpoint>

and you can access the values from your code, similarly to reading normal app settings, like that:

var myEndpointConfig = (Hashtable)ConfigurationManager.GetSection("myEndpoint");
Console.WriteLine(myEndpointConfig["myKey"]);

Answer 2

The right way is to merge the DLL's config file into the EXE's; that'll work out of the box. But see .NET DLL Settings and Config when there's a Web Reference - whats going on? for a way to explicitly open a config file and read it. The problem is that you'd need to FIND the config file first, and that's not necessarily easy. If the DLL is just sitting around, you could check the same directory. But if it's in the GAC, where do you look? I suggest sticking to the right way.

Answer 3

如果您使用svcutil生成代理，这可能有所帮助：检查/config:和/mergeConfig开关，您可以指定哪些配置文件接收生成的信息，您可以将其合并而不是仅覆盖已存在的任何内容。