System.Xml.XmlBaseWriter.PreStartElementAsyncCheck C# (CSharp) Méthode

        private void PreStartElementAsyncCheck(string prefix, string localName, string ns, XmlDictionaryString xNs)
        {
            if (IsClosed)
                ThrowClosed();

            if (_documentState == DocumentState.Epilog)
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.Format(SR.XmlOnlyOneRoot)));
            if (localName == null)
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException(nameof(localName)));
            if (localName.Length == 0)
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentException(SR.Format(SR.InvalidLocalNameEmpty), nameof(localName)));
            if (_writeState == WriteState.Attribute)
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.Format(SR.XmlInvalidWriteState, "WriteStartElement", WriteState.ToString())));
        }