GoXmlWriter

GoDiagram (6 and previous)
1

I am using the Eval Version of GoDiagram and trying to write a diagram our to XML.

The following code is called:
GoXmlWriter writer = new GoXmlWriter();
writer.RootElementName = "MethodEditor";
writer.AddTransformer(new TransformNode());
writer.AddTransformer(new TransformLink());
writer.NodesGeneratedFirst = true;
writer.Objects = document;
fileStream = File.Open(@"c:\temp\myShapes.xml", FileMode.Create);
writer.Generate(fileStream);
fileStream.Close();
I always end up with an XML file with nothing but the Root Element.
I set a breakpoint in GenerateAttributes for TransformNode and TransformLink but it never breaks there?
Am I doing something wrong. I am trying to follow the examples in the sample applications that have a Save functionality.
Any help appreciated.
2

Does the TransformNode constructor assign its TransformerType property to the class of the nodes you have in your document? (And the same applies to TransformLink.)

3

Yes they do here are the constructors

public TransformNode()
{
this.TransformerType = typeof(MethodEditorNode);
this.ElementName = "node";
this.IdAttributeUsedForSharedObjects = true;
}
public TransformLink()
{
this.TransformerType = typeof(MethodEditorLink);
this.ElementName = "link";
}
4

That’s odd. I’m assuming you haven’t overidden any methods to skip the generation of XML for your objects.

Well, you could try overriding GoXmlWriter.GenerateObject to see if that's being called for each top-level object in your document.
5

Maybe I am doing something wrong, this is what I have:

I created a class called MyXml, the constructor takes a GoDocument and assigns it to a private field in MyXML.
This class also has a Save( ) method which is in the original post above.
MyXml xml = new MyXml(View.Document);
xml.Save();
In TransformNode I have overridden GenerateAttributes but it never seens to execute.
Do I need to override the GoXmlWriter? Or are you just suggesting it as a test?
6

Everything that I have seen looks OK to me, so, yes, I was just suggesting that overriding GoXmlWriter.GenerateObject might be a way to figure out what’s going on.

7

I created a MyXMLWriter inherited from GoXMLWriter and created the following:

public override void GenerateObject(object obj)
{
base.GenerateObject(obj);
}
I changed MyXml.Save to this:
MyXMLWriter writer = new MyXMLWriter();
writer.RootElementName = "MethodEditor";
writer.AddTransformer(new TransformNode());
writer.AddTransformer(new TransformLink());
writer.NodesGeneratedFirst = true;
writer.Objects = document;
fileStream = File.Open(@"c:\temp\myShapes.xml", FileMode.Create);
writer.Generate(fileStream);
fileStream.Close();
I set a break point in MyXmlWriter.GenerateObject( )
The debugger did not stop on that Break Point when I executed the code.
8

Hmmm. I guess I have to ask: are you sure the document has nodes in it? What’s the value of GoDocument.Count?

GoXmlWriter.Generate(...) calls GoXmlWriter.GenerateObjects() which iterates over the GoXmlWriter.Objects collection, calling GoXmlWriter.GenerateObject on each object.
9

You Nailed it.

Although I don't know why. I definatley have objects, but the count is 0.
I must have more documents then I realize, and I'm passing the wrong one.
I'll investigate further.
Thanks for the help. Please pass along any other ideas you might have.
10

That was the problem. I had my own version of GoDocument and somewhere along the way I ended up passing a wrong instance to the XMl File code.

Thanks for your help, much appreciated.