[Mono-dev] Equivalent of csc /link for mcs (COM interop)?

[Daniel Lo Nigro]

Have you tried using the newer dynamic stuff to do your COM interop calls?

http://www.codeproject.com/Tips/143694/Get-rid-of-COM-Interop-DLL-by-using-the-new-C-4-dy
http://msdn.microsoft.com/en-us/magazine/ff714583.aspx


On Wed, Nov 14, 2012 at 4:27 AM, Peter Dillinger <pcd768 at gmail.com> wrote:

> (This message was not accepted from my work email and or from the
> forum interface.  Trying personal email...)
>
> In investigating the ability to drop in mcs as a replacement for csc
> (currently trying out mono 2.11.4), I've run into issues in compiling
> things from some Microsoft C# 4.0 code samples that involve COM
> interop.  Here's a simplified example:
>
> public class Program
> {
>     public static void Test(Microsoft.Office.Interop.Excel.Application xl)
>     {
>         xl.Columns[2].AutoFit();
>     }
>     public static void Test2(Microsoft.Office.Interop.Excel.Range r)
>     {
>         r.Value = 42;
>     }
> }
>
> Compiling this with csc requires -link (aka /link), as seen here:
>
> $ cp /cygdrive/c/Program\ Files\ \(x86\)/Microsoft\ Visual\ Studio\
> 10.0/Visual\ Studio\ Tools\ for\
> Office/PIA/Office12/Microsoft.Office.Interop.Excel.dll .
> $ /cygdrive/c/Windows/Microsoft.NET/Framework/v4.0.30319/csc.exe
> -target:library
>   -link:Microsoft.Office.Interop.Excel.dll Program.cs
> Microsoft (R) Visual C# Compiler version 4.0.30319.17929
> for Microsoft (R) .NET Framework 4.5
> Copyright (C) Microsoft Corporation. All rights reserved.
> $ /cygdrive/c/Windows/Microsoft.NET/Framework/v4.0.30319/csc.exe
> -target:library
>   -r:Microsoft.Office.Interop.Excel.dll Program.cs
> Microsoft (R) Visual C# Compiler version 4.0.30319.17929
> for Microsoft (R) .NET Framework 4.5
> Copyright (C) Microsoft Corporation. All rights reserved.
>
> Program.cs(5,23): error CS1061: 'object' does not contain a definition
> for 'AutoFit' and no extension method 'AutoFit' accepting a first
> argument of type 'object' could be found (are you missing a using
> directive or an assembly reference?)
> $
>
> So trying to compile this with mcs, it seems the closest we can come
> to -link is to replace with -r, so we would expect it to fail
> similarly to mcs above, which it does for 'Test' but 'Test2' has other
> problems:
>
> $ /cygdrive/c/Program\ Files\ \(x86\)/Mono-2.11.4/bin/mcs.bat
> -target:library
>   -r:Microsoft.Office.Interop.Excel.dll Program.cs
> Program.cs(5,23): error CS1061: Type `object' does not contain a
> definition for `AutoFit' and no extension method `AutoFit' of type
> `object' could be found. Are you missing an assembly reference?
> C:\PROGRA~2\MONO-2~1.4\lib\mono\4.5\mscorlib.dll (Location of the
> symbol related to previous error)
> Program.cs(9,11): error CS1546: Property or event
> `Microsoft.Office.Interop.Excel.Range.Value' is not supported by the
> C# language
> D:\scalability-csharp\test-cs4codesamples-orig\samples\This sample
> shows how to use the\C#\Microsoft.Office.Interop.Excel.dll (Location
> of the symbol related to previous error)
> Program.cs(9,11): error CS0200: Property or indexer
> `Microsoft.Office.Interop.Excel.Range.Value' cannot be assigned to (it
> is read-only)
> Compilation failed: 3 error(s), 0 warnings
> $
>
> This leads me to two questions:
>
> (1) Is there any plan to support an equivalent of csc -link (aka
> /link)?  Or is there some other work-around I don't know about?
>
> (2) It appears that the "is not supported by the C# language"+"cannot
> be assigned to" issue a bug.  Is that correct?  (If so, I can file
> it.)
>
> And a bonus question:
>
> (3) For general C# language issues where csc willingly compiles
> something that is arguably not adherent to the language spec, but mcs
> rejects it, does the Mono team consider that a valid bug or
> enhancement request?  (Is there a "duplicate Microsoft's bugs" mode
> for mcs?)
>
> Thanks for your help,
>
>
> Peter Dillinger | Senior Engineer
> Coverity | 185 Berry Street | Suite 6500, Lobby 3 | San Francisco, CA 94107
> The Leader in Development Testing
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