问题
I have an instance of a COM object... which is created like this:
Type type = TypeDelegator.GetTypeFromProgID("Broker.Application");
Object application = Activator.CreateInstance(type);
When I try to invoke a method:
type.GetMethod("RefreshAll").Invoke(application, null);
-> type.GetMethod("RefreshAll") returns null.
When I try to get all the methods with type.GetMethods(), there is only these methods:
- GetLifetimeService
- InitializeLifetimeService
- CreateObjRef
- ToString
- Equals
- GetHashCode
- GetType
Where is the RefreshAll Method? And how can I invoke it?
回答1:
You can't use GetMethod on COM objects, you have to use a different way:
this.application.GetType().InvokeMember("RefreshAll", BindingFlags.InvokeMethod, null, this.application, null);
I am using this way in a old project that uses COM so it should work ok for you.
回答2:
I realise this is a late answer but c# 4 changes things a bit with the introduction of the dynamic keyword which was designed with COM-interop in mind.
MSDN:
The COM interop scenario that the C# team specifically targeted in the C# 4 release was programming against Microsoft Office applications, such as Word and Excel. The intent was to make this task as easy and natural in C# as it always was in Visual Basic. [1]
Your code now becomes:
Type type = TypeDelegator.GetTypeFromProgID("Broker.Application");
dynamic application = Activator.CreateInstance(type);
application.RefreshAll(); // <---- new in c# 4
Now you won't see RefreshAll() in Visual Studio statement completion so don't be alarmed. It will compile.
[1] Understanding the Dynamic Keyword in C# 4
来源：https://stackoverflow.com/questions/2773022/invoke-method-using-reflection-on-com-object