I am trying to load an assembly at runtime, and I'm unsure as to why I can't create an instance of a type in the assembly using the static Activator.CreateInstance(). It works with Assembly.CreateInstance().

string assemblyFilename = "MyAssembly.dll";
string assemblyName = "MyAssembly";
string typeName = "MyAssembly.MyType";

FileInfo fileInfo = new FileInfo(assemblyFilename);

本作品：

var assembly = Assembly.LoadFrom(assemblyFilename);
Form form = (Form)assembly.CreateInstance(typeName);

但是，这并不工作：​​

But this does NOT work:

Assembly.LoadFrom(assemblyFilename);
Form form = (Form)Activator.CreateInstance(assemblyName, typeName).Unwrap();

FileNotFoundException异常抛出：

FileNotFoundException thrown:

无法加载文件或程序集MyAssembly程序或它的一个   依赖性。该系统找不到指定的文件。

Could not load file or assembly 'MyAssembly' or one of its dependencies. The system cannot find the file specified.

编辑：

在这两种情况下， Assembly.LoadFrom（）通话后，我可以看到，当我在看的AppDomain我的组件已被装。 CurrentDomain.GetAssemblies（）。

In both cases, after the Assembly.LoadFrom() call, I can see that my assembly has been loaded when I look in AppDomain.CurrentDomain.GetAssemblies().

推荐答案

您必须先加载组件到当前的AppDomain：

You have to first load the assembly into your current AppDomain:

AppDomain.CurrentDomain.Load(File.ReadAllBytes(assemblyFileName));

编辑：这是否工作

Does this work?

Form form = (Form)Activator.CreateInstance(Type.GetType(typeName))