td><div class="summary">
            获取XDocument转换后的IRequestMessageBase实例。
            如果MsgType不存在，抛出UnknownRequestMsgTypeException异常
            </div></td></tr></table><a href="#PageHeader">Top</a></div><div class="collapsibleAreaRegion" id="seeAlsoSection"><span class="collapsibleRegionTitle" onclick="SectionExpandCollapse('ID1RB')" onkeypress="SectionExpandCollapse_CheckKey('ID1RB', event)" tabindex="0"><img id="ID1RBToggle" class="collapseToggle" src="../icons/Sec