我有使用AppDomain动态加载插件的代码。我有一个名为PluginFinder的私有内部类来完成这项工作。这一切都在生产环境中工作,但是我现在正尝试为它编写MS单元测试,并且我收到一个错误,说找不到程序集。
要清楚的是,主类创建AppDomain并在其中运行PluginFinder,以加载使用正确接口找到的类。加载类后,控件将返回到默认的AppDomain。仅在加载过程中使用PlugInfender。
我使用下面的代码创建环境:
// Create a domain to text for plugins
AppDomain domain = AppDomain.CreateDomain("PluginLoader");
// Set PluginFinder to run in the new domain (assemblyName, typeName)
(PluginFinder)domain.CreateInstanceAndUnwrap(
typeof(PluginFinder).Assembly.FullName, typeof(PluginFinder).FullName);
PlugInfender使用默认的构造函数,是一个私有的内部类。我得到的例外情况如下:
------ Exception ------
Error: Could not load file or assembly 'MyClass, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.
There was an error creating the Plugin Loader.
Could not load file or assembly 'MyClass, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.
at System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)
at System.Reflection.RuntimeAssembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)
at System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName assemblyRef, Evidence assemblySecurity, RuntimeAssembly reqAssembly, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)
at System.Activator.CreateInstance(String assemblyString, String typeName, Boolean ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes, Evidence securityInfo, StackCrawlMark& stackMark)
at System.Activator.CreateInstance(String assemblyName, String typeName)
at System.AppDomain.CreateInstance(String assemblyName, String typeName)
at System.AppDomain.CreateInstanceAndUnwrap(String assemblyName, String typeName)
at System.AppDomain.CreateInstanceAndUnwrap(String assemblyName, String typeName)
at MyClass.loadPlugins() in C:\Code\...
---- End Exception ----
我找到了
this
解决方案,它建议nunit在多个appdomain中运行,这使得没有插件就无法测试appdomain。我正在使用MS单元测试,但我怀疑这里也可能发生这种情况。
****已解决****
正如下面的注释中提到的,我需要使用重载构造函数。我修改了我的代码(如下所示),它起作用了。
// Set up the AppDomainSetup
var setup = new AppDomainSetup();
setup.ApplicationBase = AppDomain.CurrentDomain.BaseDirectory;
// Set up the Evidence
var baseEvidence = AppDomain.CurrentDomain.Evidence;
// Create a domain to text for plugins
AppDomain domain = AppDomain.CreateDomain("PluginLoader", baseEvidence, setup);
// Set PluginFinder to run in the new domain (assemblyName, typeName)
PluginFinder finder = (PluginFinder)domain.CreateInstanceAndUnwrap(
typeof(PluginFinder).Assembly.FullName, typeof(PluginFinder).FullName);