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问题描述
有可能在.NET应用程序(C#)中有条件地检测类是否在运行时定义了
Is it possible in a .NET app (C#), to conditionally detect if a class is defined at runtime?
示例实现 - 基于配置选项的类对象?
Sample implementation - say you want to create a class object based on a configuration option?
推荐答案我做了这样的事情,类从Config并实例化它。在这个例子中,我需要确保配置中指定的类继承自一个名为NinjectModule的类,但我认为你得到了想法。
I've done something like that, load a class from the Config and instantiate it. In this example, I needed to make sure the class specified in the config inherited from a class called NinjectModule, but I think you get the idea.
protected override IKernel CreateKernel() { // The name of the class, e.g. retrieved from a config string moduleName = "MyApp.MyAppTestNinjectModule"; // Type.GetType takes a string and tries to find a Type with // the *fully qualified name* - which includes the Namespace // and possibly also the Assembly if it's in another assembly Type moduleType = Type.GetType(moduleName); // If Type.GetType can't find the type, it returns Null NinjectModule module; if (moduleType != null) { // Activator.CreateInstance calls the parameterless constructor // of the given Type to create an instace. As this returns object // you need to cast it to the desired type, NinjectModule module = Activator.CreateInstance(moduleType) as NinjectModule; } else { // If the Type was not found, you need to handle that. You could instead // initialize Module through some default type, for example // module = new MyAppDefaultNinjectModule(); // or error out - whatever suits your needs throw new MyAppConfigException( string.Format("Could not find Type: '{0}'", moduleName), "injectModule"); } // As module is an instance of a NinjectModule (or derived) class, we // can use it to create Ninject's StandardKernel return new StandardKernel(module); }更多推荐
如何在运行时在.NET中检测类的存在?
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