Hello.

Problem:

I'm getting a C# compiler error on my .aspx web page:  CS0118: 'oMap' is a 'variable' but is used like a 'method'  I am using a managed .net wrapper generated by TLBIMP.EXE for one of our COM components.  As best as I can tell, the managed wrapper does not support properties in the COM IDL that have a dispatch id of 0 (using the DISPID_VALUE contant).

Code:

This is an example of the original JavaScript code that I am trying to convert:

var oMap = Server.CreateObject("util_Map");
oMap("key1") = "asdf";
oMap("key2") = "zxcv";

This is the C# migrated code on my .aspx web page that gets the compiler error:

util_Map oMap = new util_Map();
oMap("key1") = "asdf";  <-- CS0118: 'oMap' is a 'variable' but is used like a 'method'  
oMap("key2") = "zxcv";

The IDL of the COM object is defined as such for these properties:

interface util_IMap : IDispatch
{
   [
      propput, 
      id(DISPID_VALUE), 
      helpstring("Add a key, value pair to the map.")
   ]
   HRESULT Item([in] BSTR Key, [in] VARIANT Value);

   [
      propget,
      id(DISPID_VALUE),
      helpstring("Retrieve a key's value from the map.")
   ]
   HRESULT Item([in] BSTR Key, [out, retval] VARIANT *pValue);

....

HOW DO I MIGRATE THIS CODE?

I've tried various permutations of the original code like oMap("key1", "asdf") or even oMap.set_Item("key1") = "asdf", but they just give different compiler errors.  So, at this point, I can't use our legacy COM object with the managed wrapper.

Ideas?

Hi LowRider2112.

The type library conversion process transforms property accessor methods in the following ways:

• Properties with the [propget] attribute become managed properties of the same type, with a corresponding method called get_propertyname.

• Properties with either the [propput] attribute or [propputref] attribute become managed properties of the same type, with a corresponding method called set_propertyname.

 For additional information about type library conversion, click the following article to view the article in the MSDN:

http://msdn2.microsoft.com/en-us/library/k639e386.aspx

Actually, all I had to do is use square brackets in C# instead of ().

For more information, please review this post:

http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=2107752&SiteID=1