private string DeterminePrefixAndNamespaceUri()
{
if (!string.ReferenceEquals(namespaceUri, null))
{
if (RootElement != null && namespaceUri.Equals(RootElement.NamespaceUri))
{
// global namespaces do not have a prefix or namespace URI
return(null);
}
else
{
// lookup for prefix
string lookupPrefix = this.LookupPrefix();
if (string.ReferenceEquals(lookupPrefix, null) && RootElement != null)
{
// if no prefix is found we generate a new one
// search for known prefixes
string knownPrefix = KnownPrefixes[namespaceUri];
if (string.ReferenceEquals(knownPrefix, null))
{
// generate namespace
return(RootElement.RegisterNamespace(namespaceUri));
}
else if (knownPrefix.Length == 0)
{
// ignored namespace
return(null);
}
else
{
// register known prefix
RootElement.RegisterNamespace(knownPrefix, namespaceUri);
return(knownPrefix);
}
}
else
{
return(lookupPrefix);
}
}
}
else
{
// no namespace so no prefix
return(null);
}
}
public virtual void RegisterNamespace(string prefix, string namespaceUri)
{
lock (_document)
{
IDomElement rootElement = RootElement;
if (rootElement != null)
{
rootElement.RegisterNamespace(prefix, namespaceUri);
}
else
{
throw new ModelException("Unable to define a new namespace without a root document element");
}
}
}
