[MonoDevelop] Opening a c# file gives InvalidCastException

[Christian Hergert]

I verified your bug with gtksourceview-sharp from svn. This can easily
be fixed by using the 0.7 tarball. Please download and install from:

  http://www.go-mono.com/archive/1.1.5/gtksourceview-sharp-0.7.tar.gz


On Mon, 28 Mar 2005 11:14:03 +1000, Jonathan Wheelhouse
<wheelhouse@exemail.com.au> wrote:
> Hi
> 
> I have the latest mono, mcs, gtksourceview-sharp, MonoDevelop from svn
> compiled and installed.
> 
> When I attempt to open a c# file using MonoDevelop I get the following
> message on the console:
> 
> Error while loading System.InvalidCastException: Cannot cast from source type to destination type.
> in <0x00058> GtkSourceView.SourceLanguagesManager:GetLanguageFromMimeType (System.String mime_type)
> 
> (I've included the full error message below the dashed line.)
> 
> MonoDevelop doesn't crash but the file doesn't display; there is just a
> blank window.
> 
> I know the mime type of the file is as it should be since I added a Console.WriteLine
> statement.  When I run monodevelop on a c# file I get the following:
> jdw SourceEditorDisplayBinding.Load file :/usr/local/src/mono/tomboy/Tomboy/Tomboy.cs: mimetype :text/x-csharp:
> 
> GtkSourceView.SourceLanguagesManager shows the following:
> 
>         [DllImport("gtksourceview-1.0")]
>                 static extern IntPtr gtk_source_languages_manager_get_language_from_mime_type(IntPtr raw, string mime_type);
> 
>                 public GtkSourceView.SourceLanguage GetLanguageFromMimeType(string mime_type) {
>                         IntPtr raw_ret = gtk_source_languages_manager_get_language_from_mime_type(Handle, mime_type);
>                         GtkSourceView.SourceLanguage ret;
>                         if (raw_ret == IntPtr.Zero)
>                                 ret = null;
>                         else
>                                 ret = (GtkSourceView.SourceLanguage) GLib.Object.GetObject(raw_ret);
>                         return ret;
>                 }
> 
> I assume the object returned is not a SourceLanguage; that's why there is an invalid cast.
> 
> Text files (mimetype text/plain) open up OK.
> 
> I'm running Debian unstable; have also got libgnome-cil and its
> dependencies installed so I can compile and run tomboy.
> 
> Version of Debian libgtksourceview is 1.2.0-1 .
> 
> Any ideas?
> 
> ------------------------------------------------------------------------
> /usr/local/src/mono/MonoDevelop$ make run
> cd build/bin && LD_LIBRARY_PATH=`echo "/usr/local/lib:" | sed 's/^://g'`
> /usr/local/bin/mono --debug MonoDevelop.exe
> Entering VB.NET parser
> Reading
> /home/jonathan/.config/MonoDevelop//CodeCompletionData/mscorlib_1.0.5000.0_b77a5c561934e089.pidb
> Creating DefaultWorkbench
> Socket already in use
> 
> jdw SourceEditorDisplayBinding.Load file :/usr/local/src/mono/tomboy/Tomboy/Tomboy.cs: mimetype :text/x-csharp:
> 
> Error while loading System.InvalidCastException: Cannot cast from source
> type to destination type.
> in <0x00058>
> GtkSourceView.SourceLanguagesManager:GetLanguageFromMimeType
> (System.String mime_type)
> in <0x00016> MonoDevelop.SourceEditor.Gui.SourceEditorBuffer:LoadText
> (System.String text, System.String mime)
> in <0x00036> MonoDevelop.SourceEditor.Gui.SourceEditorBuffer:LoadFile
> (System.String file, System.String mime)
> in <0x00066>
> MonoDevelop.SourceEditor.Gui.SourceEditorDisplayBindingWrapper:Load
> (System.String fileName)
> in <0x0002e>
> MonoDevelop.SourceEditor.Gui.SourceEditorDisplayBinding:CreateContentForFile
> (System.String fileName)
> in <0x00023>
> MonoDevelop.Services.DefaultFileService+LoadFileWrapper:Invoke
> (System.String fileName)
> in (wrapper delegate-invoke) System.MulticastDelegate:invoke_void_string
> (string)
> in <0x00014>
> MonoDevelop.Core.Services.FileUtilityService+LoadWrapper:Invoke ()
> in (wrapper delegate-invoke) System.MulticastDelegate:invoke_void ()
> in <0x00018> MonoDevelop.Core.Services.FileUtilityService:ObservedLoad
> (MonoDevelop.Core.Services.FileOperationDelegate saveFile, System.String
> fileName, System.String message, FileErrorPolicy policy)
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> 


-- 
Christian Hergert
Mosaix Communications, Inc.
Software Engineer
C: 253 906 2115