.NET 3.5 DLL 使用自己的配置文件 [英] .NET 3.5 DLL using its own config file
问题描述
我需要一个 .NET 3.5 DLL 有自己的配置文件.这个 DLL 可以从许多不同的应用程序调用，因此存储在配置文件中的信息(如连接字符串)需要保存在 DLL 可以引用的配置文件中.我想要的是当使用 DLL 时，我需要将用于引用信息的配置文件切换"为 DLL 配置文件.然后，当 DLL 使用配置信息完成时，切换回默认设置.DLL 是使用 .NET 3.5 编写的.我一直在寻找如何做到这一点，我一直在寻找如何将信息与 exe 的 app.config 文件合并.就我而言，我不知道如何使用此 DLL 来修改任何 exe 的 app.config 文件.这个解决方案需要是独立的.但是，我用于创建 DLL(包含业务对象)的基类期望在配置文件中查找连接字符串和其他信息，这就是为什么我需要在它的时候切换"到我的 DLL 配置文件被访问，然后将其切换回来，这样我就不会弄乱调用 DLL 的 exe 应用程序.
I need to have a .NET 3.5 DLL have its own config file. This DLL could be called from many different apps so the information (like connection strings) stored in the config file needed to be kept in a config file that the DLL can reference. What I want is when the DLL is used, I need to "switch" the config file that is used to reference information to be the DLLs config file. Then when the DLL is done with using the configuration information, the switch is made back to the default one. The DLL is written using .NET 3.5. I have been searching for how to do this and what I keep finding is how to merge information with an exe's app.config file. In my case, I don't know how where this DLL will be used to modify any exe's app.config files out there. This solution needs to be stand alone. However, my base classes used to create the DLL (which contain business objects) are expecting to lookup the connection string and other information in a config file so that is why I need to "switch" to my DLL config file at the time when it is accessed and then switch it back so I don't mess up the exe app that called the DLL.
推荐答案
.NET 2.0 及更高版本的配置系统为您提供功能 - 您可以例如按需加载特定的配置文件.这需要更多的工作 - 但它有效.
The .NET 2.0 and up configuration system gives you capabilities - you can e.g. load a specific config file on demand. It's a bit more work - but it works.
你必须做这样的事情:
// set up a exe configuration map - specify the file name of the DLL's config file
ExeConfigurationFileMap map = new ExeConfigurationFileMap();
map.ExeConfigFilename = "ConfigLibrary.config";
// now grab the configuration from the ConfigManager
Configuration cfg = ConfigurationManager
.OpenMappedExeConfiguration(map, ConfigurationUserLevel.None);
// now grab the section you're interested in from the opened config -
// as a sample, I'm grabbing the <appSettings> section
AppSettingsSection section = (cfg.GetSection("appSettings") as AppSettingsSection);
// check for null to be safe, and then get settings from the section
if(section != null)
{
string value = section.Settings["Test"].Value;
}
您还需要确保正在构建类库 DLL 的配置并将其复制到您可以访问的位置.最坏的情况是您需要指定特定的配置文件，并通过在 Visual Studio 属性窗口中设置其复制到输出目录"属性来确保将其复制到输出目录.
You also need to make sure that the config for the class library DLL is being built and copied to a location where you can get at it. Worst case you need to specify a specific config file and make sure it gets copied to the output directory by setting its "Copy To Output Directory" property in the Visual Studio properties window.
您还应该在 CodeProject 上查看 Jon Rista 关于 .NET 2.0 配置的三部分系列.
You should also check out Jon Rista's three-part series on .NET 2.0 configuration up on CodeProject.
强烈推荐，写得很好，非常有帮助！
Highly recommended, well written and extremely helpful!
马克
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