private RawDataSourceInfoBase InitDataContext(DataBindingProcessingContext context)
{
if (PlatformTypes.ResourceDictionary.IsAssignableFrom((ITypeId)context.DocumentNode.Type))
{
return((RawDataSourceInfoBase)RawDataSourceInfo.NewEmpty);
}
if (DataContextHelper.IsDataContextProperty((DocumentNode)context.ParentNode, (IPropertyId)context.Property))
{
return(context.GrandparentDataContext);
}
DataBindingProcessor.DataContextWalker dataContextWalker = new DataBindingProcessor.DataContextWalker(context.ParentContext, context.Property, this.namedElementDataContexts);
RawDataSourceInfoBase localDataContext = this.DataContextEvaluator.NavigateSpecialDataContext((IDataContextAncestorWalker)dataContextWalker, (RawDataSourceInfoBase)null);
if (localDataContext == null)
{
RawDataSourceInfoBase rawDataContextInfo = this.DataContextEvaluator.GetRawDataContextInfo(context.DocumentCompositeNode);
localDataContext = this.DataContextEvaluator.UnwindElementNameBinding((IDataContextAncestorWalker)dataContextWalker, rawDataContextInfo);
}
this.DataContextEvaluator.MoveUpIfDataContextLocation((IDataContextAncestorWalker)dataContextWalker);
if (localDataContext is ElementDataSourceInfo)
{
return(localDataContext);
}
if (dataContextWalker.CurrentContext != null)
{
localDataContext = this.CombineDataSources(dataContextWalker.CurrentContext.DataContext, localDataContext);
}
if (localDataContext == null)
{
localDataContext = (RawDataSourceInfoBase)RawDataSourceInfo.NewEmpty;
}
return(localDataContext);
}
protected RawDataSourceInfoBase CombineDataSources(RawDataSourceInfoBase inheritedDataContext, RawDataSourceInfoBase localDataContext)
{
if (localDataContext == null)
{
return(inheritedDataContext);
}
if (!localDataContext.IsValid || localDataContext.HasSource)
{
return(localDataContext);
}
ElementDataSourceInfo elementDataSourceInfo = localDataContext as ElementDataSourceInfo;
RawDataSourceInfoBase localSource;
if (elementDataSourceInfo == null)
{
localSource = inheritedDataContext == null || !inheritedDataContext.IsValid ? localDataContext : inheritedDataContext.CombineWith(localDataContext);
}
else
{
DataBindingProcessingContext context;
if (!this.namedElementDataContexts.TryGetValue(elementDataSourceInfo.RootElement, out context))
{
localSource = (RawDataSourceInfoBase)elementDataSourceInfo;
}
else
{
DataBindingProcessor.DataContextWalker dataContextWalker = new DataBindingProcessor.DataContextWalker(context, (IProperty)null, this.namedElementDataContexts);
localSource = this.DataContextEvaluator.UnwindElementNameBinding((IDataContextAncestorWalker)dataContextWalker, (RawDataSourceInfoBase)elementDataSourceInfo);
if (!(localSource is ElementDataSourceInfo))
{
this.DataContextEvaluator.MoveUpIfDataContextLocation((IDataContextAncestorWalker)dataContextWalker);
if (dataContextWalker.CurrentContext != null)
{
localSource = dataContextWalker.CurrentContext.DataContext.CombineWith(localSource);
}
}
}
}
return(localSource);
}