System.Xml.XmlWellFormedWriter.WriteStartElement C# (CSharp) Méthode

        public override void WriteStartElement(string prefix, string localName, string ns)
        {
            try
            {
                // check local name
                if (localName == null || localName.Length == 0)
                {
                    throw new ArgumentException(SR.Xml_EmptyLocalName);
                }
                CheckNCName(localName);

                AdvanceState(Token.StartElement);

                // lookup prefix / namespace  
                if (prefix == null)
                {
                    if (ns != null)
                    {
                        prefix = LookupPrefix(ns);
                    }
                    if (prefix == null)
                    {
                        prefix = string.Empty;
                    }
                }
                else if (prefix.Length > 0)
                {
                    CheckNCName(prefix);
                    if (ns == null)
                    {
                        ns = LookupNamespace(prefix);
                    }
                    if (ns == null || (ns != null && ns.Length == 0))
                    {
                        throw new ArgumentException(SR.Xml_PrefixForEmptyNs);
                    }
                }
                if (ns == null)
                {
                    ns = LookupNamespace(prefix);
                    if (ns == null)
                    {
                        Debug.Assert(prefix.Length == 0);
                        ns = string.Empty;
                    }
                }

                if (_elemTop == 0 && _rawWriter != null)
                {
                    // notify the underlying raw writer about the root level element
                    _rawWriter.OnRootElement(_conformanceLevel);
                }

                // write start tag
                _writer.WriteStartElement(prefix, localName, ns);

                // push element on stack and add/check namespace
                int top = ++_elemTop;
                if (top == _elemScopeStack.Length)
                {
                    ElementScope[] newStack = new ElementScope[top * 2];
                    Array.Copy(_elemScopeStack, newStack, top);
                    _elemScopeStack = newStack;
                }
                _elemScopeStack[top].Set(prefix, localName, ns, _nsTop);

                PushNamespaceImplicit(prefix, ns);

                if (_attrCount >= MaxAttrDuplWalkCount)
                {
                    _attrHashTable.Clear();
                }
                _attrCount = 0;
            }
            catch
            {
                _currentState = State.Error;
                throw;
            }
        }