Mono.Xml.XmlTextWriter.WriteQualifiedName C# (CSharp) Method

		public override void WriteQualifiedName (
			string localName, string ns)
		{
			if (localName == null)
				throw ArgumentError ("localName");
			if (ns == null)
				ns = String.Empty;

			if (ns == XmlnsNamespace)
				throw ArgumentError ("Prefix 'xmlns' is reserved and cannot be overriden.");
			if (!XmlChar.IsNCName (localName))
				throw ArgumentError ("localName must be a valid NCName.");

			ShiftStateContent ("QName", true);

			string prefix = ns.Length > 0 ? LookupPrefix (ns) : String.Empty;
			if (prefix == null) {
				if (state == WriteState.Attribute)
					prefix = MockupPrefix (ns, false);
				else
					throw ArgumentError (String.Format ("Namespace '{0}' is not declared.", ns));
			}

			if (prefix != String.Empty) {
				writer.Write (prefix);
				writer.Write (":");
			}
			writer.Write (localName);
		}