请教各位如何在ArcEngine中实现一个mxd文档的关闭？

<P>我用ArcEngine + C#,可以根据例子实现MXD文档的打开和保存，但是如何实现文档关闭并使程序产生一个空白文档呢？</P>
<P>谢谢。</P>

<P>不会用C#</P>
<P>vc的例子：</P>
<P> </P>
<DIV class=O v:shape="_x0000_s1026">
<DIV '80 20 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1">&#8226;IMapDocumentPtr doc(__uuidof(MapDocument)); </DIV>
<DIV '80 20 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1">&#8226; IMapPtr map;//(__uuidof(Map)); </DIV>
<DIV '80 20 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1">&#8226; doc->New(L"e:\\new1.mxd"); </DIV>
<DIV '80 20 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1">&#8226; doc->get_Map(0,;map); //并不会出错，而是增加一个新的map </DIV>
<DIV '80 20 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1"></DIV>
<DIV '80 20 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1">&#8226; IWorkspaceFactoryPtr wf(__uuidof(ShapefileWorkspaceFactory)); </DIV>
<DIV '80 20 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1">&#8226; IWorkspacePtr w; </DIV>
<DIV '80 20 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1">&#8226; wf->OpenFromFile(L"e:\\gis_data\\shp\\world\\",NULL,;w); </DIV>
<DIV '80 20 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1">&#8226; IFeatureWorkspacePtr fw; </DIV>
<DIV '80 20 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1">&#8226; fw=w; </DIV>
<DIV '80 20 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1"></DIV>
<DIV '80 20 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1">&#8226; IFeatureClassPtr fc; </DIV>
<DIV '80 20 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1">&#8226; fw->OpenFeatureClass(L"rivers",;fc); </DIV>
<DIV '80 20 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1">&#8226; </DIV>
<DIV '80 20 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1">&#8226; IFeatureLayerPtr fl(__uuidof(FeatureLayer)); </DIV>
<DIV '80 20 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1">&#8226; fl->putref_FeatureClass(fc); </DIV>
<DIV '80 20 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1">&#8226; fl->put_Name(L"test..."); </DIV>
<DIV '80 20 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1">&#8226; map->AddLayer(fl); </DIV>
<DIV '80 20 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1">&#8226; </DIV>
<DIV '80 20 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1">&#8226; doc->Save(TRUE,FALSE); </DIV>
<DIV '80 20 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1">&#8226; doc->Close(); </DIV>
<DIV '80 50 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1"></DIV></DIV>

我也想知道，我是新手，请支持我<img src="images/post/smile/dvbbs/em01.gif" />