internal static MappingViewModel CreateViewModel(EditingContext ctx, EFObject selection)
{
// clear out the xref so its clean for this new view model
var xref = ModelToMappingModelXRef.GetModelToMappingModelXRef(ctx);
xref.Clear();
// we might be creating a view model for an entity or an association or a FunctionImport
var entityType = selection as EntityType;
var association = selection as Association;
var fim = selection as FunctionImportMapping;
// create the view model root
MappingEFElement root = null;
if (entityType != null)
{
root = ModelToMappingModelXRef.GetNewOrExisting(ctx, entityType, null);
}
else if (association != null)
{
root = ModelToMappingModelXRef.GetNewOrExisting(ctx, association, null);
}
else if (fim != null)
{
root = ModelToMappingModelXRef.GetNewOrExisting(ctx, fim, null);
}
else
{
throw new ArgumentException("selection");
}
return(new MappingViewModel(ctx, root));
}
internal static ModelToMappingModelXRef GetModelToMappingModelXRef(EditingContext context)
{
var xref = context.Items.GetValue<ModelToMappingModelXRef>();
if (xref == null)
{
xref = new ModelToMappingModelXRef();
context.Items.SetValue(xref);
}
return xref;
}
internal static ModelToMappingModelXRef GetModelToMappingModelXRef(EditingContext context)
{
var xref = context.Items.GetValue <ModelToMappingModelXRef>();
if (xref == null)
{
xref = new ModelToMappingModelXRef();
context.Items.SetValue(xref);
}
return(xref);
}