[MonoDevelop] MD won't start with current SVN build

[efortin]

Michael Hutchinson wrote:
> 
> On Wed, Nov 12, 2008 at 11:53 AM, ahuegel <andreas.huegel at topalis.com>
> wrote:
>>
>> got MD from SVN. When starting I get this message. After that MD will
>> vanish:
>>
>>
>> System.TypeInitializationException: An exception was thrown by the type
>> initializer for MonoDevelop.Projects.Dom.Parser.ProjectDomService --->
>> System.NullReferenceException: Object reference not set to an instance of
>> an
>> object
>>  at Monodoc.RootTree.LoadTree (System.String basedir) [0x0025c] in
>> /tmp/mono2-build.21095/monobuild/monodoc-117204/engine/provider.cs:851
>>  at Monodoc.RootTree.LoadTree () [0x0005c] in
>> /tmp/mono2-build.21095/monobuild/monodoc-117204/engine/provider.cs:761
>>  at MonoDevelop.Projects.Dom.Parser.ProjectDomService..cctor () [0x00000]
>> in
>> /tmp/mono2-build.964/monobuild/md-svn/main/src/core/MonoDevelop.Projects/MonoDevelop.Projects.CodeGeneration/BaseRefactorer.cs:1
>>  --- End of inner exception stack trace ---
>>  at MonoDevelop.Ide.Gui.Pads.ClassPad.ProjectNodeBuilder.Initialize ()
>> [0x00017] in
>> /tmp/mono2-build.964/monobuild/md-svn/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Gui.Pads.ClassPad/ProjectNodeBuilder.cs:57
>>  at MonoDevelop.Ide.Gui.Components.NodeBuilder.SetContext
>> (ITreeBuilderContext context) [0x00007] in
>> /tmp/mono2-build.964/monobuild/md-svn/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Gui.Components/NodeBuilder.cs:47
> 
> FWIW, it appears that the crash is in MonoDoc.
> 
> 
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> 

I have exactly the same problem. I compiled Mono 2.0.1 (no package on Ubuntu
8.10). Compiled Monodoc. And compiled MonoDevelop. After compiling possible
packages imaginable that wasn't on my machine, I got to the same error
described. Started digging into Monodoc sources and got this. 


The place where the NullReferenceException comes from is the following line
in provider.cs, in LoadTree() method of RootTree class:

...
NullRef	--->		foreach (Node n in hs.Tree.Nodes){
					parent.AddNode (n);
				}
...

It can be hs that is null (HelpSource). I verified, it can't. It can be
hs.Tree. I verified, it can't. Then only Nodes property can return null. If
you look at the LoadNodes() method of the Node class...

...
	public void LoadNode ()
	{
		if (position < 0)
			position = -position;

		tree.InputStream.Position = position;
		BinaryReader reader = tree.InputReader;
		int count = DecodeInt (reader);
		element = reader.ReadString ();
		caption = reader.ReadString ();
--->		if (count == 0)
			return;
		
		nodes = new ArrayList (count);
		for (int i = 0; i < count; i++){
			int child_address = DecodeInt (reader);
							      
			Node t = new Node (this, -child_address);
			nodes.Add (t);
		}
	}
...

You see there's the if(count == 0) line. So if count == 0, meaning there's
no nodes attached to that node (I guess it's a valid situation, no childs),
then Nodes will be null. I commented out this if, compiled Monodoc again, et
voilà! it works. Now if there's no node, Nodes = new ArrayList(0).

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