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我正在用C#编写一个应用程序,它通过IDispatch连接到一个old-skool COM对象。我这样做是有这种代码:COM互操作:如何从LPDISPATCH获取CCW?
public sealed class Attachments
{
Object comObject;
Type type;
private readonly static Attachments _instance = new Attachments();
public static Attachments Instance { get { return _instance; } }
private Attachments()
{
type = Type.GetTypeFromProgID("WinFax.Attachments");
if (type == null)
throw new ArgumentException("WinFax Pro is not installed.");
comObject = Activator.CreateInstance(type);
}
public Int16 Count()
{
Int16 x = (Int16) type.InvokeMember("Count",
BindingFlags.InvokeMethod,
null,
comObject,
null);
return x;
}
....
一本IDispatch接口的方法返回一个LPDISPATCH,我把它是一个长指针到IDispatch接口。它是另一个COM对象,ProgId WinFax.Attachment。 (WinFax.Attachments管理WinFax.Attachment对象的集合。)
在C#中,如何在对应于该LPDISPATCH的COM对象上调用方法?我可以做这样的事情:
Object o = type.InvokeMember("MethodReturnsLpdispatch",
BindingFlags.InvokeMethod,
null,
comObject,
null);
Type t2 = Type.GetTypeFromProgID("WinFax.Attachment"); // different ProgId !!
Object x = t2.InvokeMember("MethodOnSecondComObject",
BindingFlags.InvokeMethod,
null,
o,
null);
使用o.GetType()。请在这里借用或窃取使用* dynamic *关键字。或者在VB.NET中写一个适配器。 – 2011-02-03 17:22:28