SharpDevelop Community

1. From a PowerShell prompt, I opened a previously saved solution by running "C:\Program Files\SharpDevelop\3.0\bin\SharpDevelop.exe" MyProject.sln
2. I got a message that it couldn't resolve \test\bin\debug\xunit.dll, which I ignored. (It usually shows up)
3. I edited one of the source files and pressed ctrl+s to save it
4. The program refused to save the file, claiming the path cannot be null or empty
5. The exception is shown below
6. I did the same again with the same result
7. I then opened SD without the solution parameter and opened the solution from the recent projects list
8. Save worked normally again

SharpDevelop Version : 3.0.0.3043
.NET Version         : 2.0.50727.1433
OS Version           : Microsoft Windows NT 5.1.2600 Service Pack 2
Current culture      : Swedish (Sweden) (sv-SE)
Current UI language  : en-US
Working Set Memory   : 62488kb
GC Heap Memory       : 15496kb

Exception thrown:
System.ArgumentException: String cannot be of zero length.
Parameter name: oldValue
   at System.String.Replace(String oldValue, String newValue)
   at ICSharpCode.SharpDevelop.Project.ProjectBrowserControl.FindDeepestOpenNodeForPath(String fileName)
   at ICSharpCode.SharpDevelop.Project.ProjectBrowserControl.TreeViewAfterExpand(Object sender, TreeViewEventArgs e)
   at System.Windows.Forms.TreeView.OnAfterExpand(TreeViewEventArgs e)
   at ICSharpCode.SharpDevelop.Gui.ExtTreeView.OnAfterExpand(TreeViewEventArgs e)
   at System.Windows.Forms.TreeView.TvnExpanded(NMTREEVIEW* nmtv)
   at System.Windows.Forms.TreeView.WmNotify(Message& m)
   at System.Windows.Forms.TreeView.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

I couldn't recreate the problem using the steps you outlined (although I don't use Powershell) - but looking at the function in question (ICSharpCode.SharpDevelop.Project.ProjectBrowserControl.FindDeepestOpenNodeForPath) I think I can see the problem... 

                    if (fileName.StartsWith(solution.Directory)) {
                        relativePath = fileName.Replace(solution.Directory, "");
                    }

There's no test around here to check that solution.Directory is not an empty string. An empty string would get past the StartsWith test (I've checked this), and would cause the exception described in the post.

Perhaps this should be:

                    if (fileName.StartsWith(solution.Directory) && (solution.Directory != "")) {
                        relativePath = fileName.Replace(solution.Directory, "");
                    }

There are a couple of examples like this in that particular function.

mjmilan 

Fixed in revision 3048.