方法一、


　　iworkspacefactory pworkspacefactory;


　　ifeatureworkspace pfeatureworkspace;


　　ifeaturelayer pfeaturelayer;


　　ifeaturedataset pfeaturedataset;


　　//開啟cad資料集


　　pworkspacefactory = new cadworkspacefactoryclass();


　　pfeatureworkspace = (ifeatureworkspace)pworkspacefactory.openfromfile(directorypath, 0);


　　//開啟一個要素集


　　pfeaturedataset = pfeatureworkspace.openfeaturedataset(filename);


　　//ifeaturclasscontainer可以管理ifeaturedataset中的每個要素類 


　　ifeatureclasscontainer pfeatureclasscontainer = (ifeatureclasscontainer)pfeaturedataset;


　　//對cad檔案中的要素進行遍歷處理 


　　for (int i = 0; i < pfeatureclasscontainer.classcount - 1; i++)


　　{


　　ifeatureclass pfeatureclass = pfeatureclasscontainer.get_class(i);


　　if (pfeatureclass.featuretype == esrifeaturetype.esriftannotation)


　　{


　　//如果是註記，則添加註記層


　　pfeaturelayer = new cadannotationlayerclass();


　　}


　　else//如果是點、線、面，則新增要素層


　　{


　　pfeaturelayer = new featurelayerclass();


　　pfeaturelayer.name = pfeatureclass.aliasname;


　　pfeaturelayer.featureclass = pfeatureclass;


　　this.axmc_main.map.addlayer(pfeaturelayer);


　　this.axmc_main.activeview.**();


　　}


　　}


　　方法二、


　　//--定義工作空間，並用cadworkspacefactoryclass()例項化它 


　　iworkspacefactory pworkspacefactory = new cadworkspacefactoryclass();


　　//--開啟相應的工作空間，並賦值給要素空間，openfromfile（） 


　　//--中的引數為cad資料夾的路徑 


　　ifeatureworkspace pfeatureworkspace = pworkspacefactory.openfromfile(directorypath, 0) as ifeatureworkspace;


　　/*--開啟線要素類，如果要開啟點型別的要素，需要把下邊的程式碼該成： 


　　*-- ifeatureclass pfeatureclass = pfeatureworkspace.openfeatureclass (filename + ":point"); 


　　*-- 由此可見filename為cad圖的名字，後邊加上要開啟的要素類的型別，中間用冒號　　


　　*-- 隔開，大家可以想想多邊形和標註是怎麼開啟的。 */


　　//point polyline


　　ifeatureclass pfeatureclass = pfeatureworkspace.openfeatureclass(filename + ":point");


　　ifeaturelayer pfeaturelayer = new featurelayerclass();


　　pfeaturelayer.featureclass = pfeatureclass;


　　this.axmc_main.map.addlayer(pfeaturelayer);


　　this.axmc_main.activeview.**();


　　方法三、


　　/*--下邊的兩行程式碼是定義一個cad工作空間，然後開啟它，但這次不是賦值給 


　　--ifeatureworkspace物件,而是賦值給iworkspace定義的物件*/


　　iworkspacefactory pworkspacefactory = new cadworkspacefactoryclass();


　　iworkspace pworkspace = pworkspacefactory.openfromfile(directorypath, 0);


　　//--定義一個cad畫圖空間，並把上邊開啟的工作空間賦給它 


　　icaddrawingworkspace pcaddrawingworkspace = pworkspace as icaddrawingworkspace;


　　//--定義一個cad的畫圖資料集，並且開啟上邊指定的工作空間中一幅cad圖 


　　//--然後賦值給cad資料集 


　　icaddrawingdataset pcaddrawingdataset = pcaddrawingworkspace.opencaddrawingdataset(filename);


　　//--通過icadlayer類，把上邊得到的cad資料局賦值給icadlayer類物件的 


　　//--caddrawingdataset屬性 


　　icadlayer pcadlayer = new cadlayerclass();


　　pcadlayer.caddrawingdataset = pcaddrawingdataset;


　　//--利用mapcontrol載入cad層 


　　this.axmc_main.map.addlayer(pcadlayer);


　　this.axmc_main.activeview.**(); 


　　方法四、


　　iworkspacefactory pworkspacefactory = new cadworkspacefactoryclass();


　　ifeatureworkspace pfeatureworkspace = pworkspacefactory.openfromfile(directorypath, 0) as ifeatureworkspace;


　　ifeaturedataset pfeaturedataset = pfeatureworkspace.openfeaturedataset(filename);


　　ifeatureclasscontainer pfeatureclasscontainer = (ifeatureclasscontainer)pfeaturedataset;


　　for (int i = 0; i < pfeatureclasscontainer.classcount - 1; i++)


　　{


　　ifeatureclass pfeatureclass = pfeatureclasscontainer.get_class(i);


　　ifeaturelayer pfeaturelayer = new featurelayerclass();


　　pfeaturelayer.featureclass = pfeatureclass;


　　//icadlayer pcadlayer = new cadlayerclass();


　　//pcadlayer = pfeaturelayer as icadlayer;


　　this.axmc_main.map.addlayer(pfeaturelayer);


　　this.axmc_main.activeview.**();


　　}


　　方法五、


　　//add passed file to mapcontrol


　　icaddrawingdataset pcaddrawingdataset = getcaddrawingdataset(directorypath, filename);


　　if (pcaddrawingdataset == null) return;


　　icadlayer pcadlayer = new cadlayerclass();


　　pcadlayer.caddrawingdataset = pcaddrawingdataset;


　　pcadlayer.name = filename;


　　this.axmc_main.addlayer(pcadlayer, 0);


　　/// <summary>


　　/// 獲取記錄集


　　/// </summary>


　　/// <param name="directorypath"></param>


　　/// <param name="filename"></param>


　　/// <returns></returns>


　　private icaddrawingdataset getcaddrawingdataset(string directorypath, string filename)


　　{


　　//create a workspacename object


　　iworkspacename pworkspacename = new workspacenameclass();


　　pworkspacename.workspacefactoryprogid = "esridatasourcesfile.cadworkspacefactory";


　　pworkspacename.pathname = directorypath;


　　//create a caddrawingname object


　　idatasetname pdatasetname = new caddrawingnameclass();


　　pdatasetname.name = filename;


　　pdatasetname.workspacename = pworkspacename;


　　//open the cad drawing


　　iname pname = (iname)pdatasetname;


　　return (icaddrawingdataset)pname.open();


　　}


　　需要注意


　　如果你的arcgis地理資訊系統 版本是v9.2的話,可能是因為你的檔名中含有中文字元的原因.據我所知,在arcgis地理資訊系統 9.2中無法顯示檔名含有中文字元的cad檔案.你可以在arcmap中直接開啟試試,如果也無法顯
此文來自: 馬開東部落格 轉載請註明出處 網址： http://www.makaidong.com
示的話,可能是檔名的問題(注:路徑中也不能含有中文字元).


　　gis地理資訊系統 for web應用開發之道


　　外掛式gis地理資訊系統 應用框架的設計與實現


　　public void esridatasourcesfile_icaddrawingdataset_example(string nameoffile, string nameofcaddrawing) 


　　{ 


　　//set the workspace factory 


　　iworkspacefactory workspacefactory = new esri.arcgis地理資訊系統 .datasourcesfile.cadworkspacefactoryclass(); 


　　//open the workspace 


　　iworkspace workspace = workspacefactory.openfromfile(nameoffile, 0); 


　　//set the caddrawingworkspace 


　　esri.arcgis地理資訊系統 .datasourcesfile.icaddrawingworkspace caddrawingworkspace = (esri.arcgis地理資訊系統 .datasourcesfile.icaddrawingworkspace)workspace; 


　　//open the caddrawingdataset 


　　esri.arcgis地理資訊系統 .datasourcesfile.icaddrawingdataset caddrawingdataset = caddrawingworkspace.opencaddrawngdataset(nameofcaddrawing); 


　　//create the cadlayer 


　　esri.arcgis地理資訊系統 .carto.icadlayer cadlayer = new esri.arcgis地理資訊系統 .carto.cadlayerclass(); 


　　//set the cadlayer to the caddrawingdataset 


　　cadlayer.caddrawingdataset = caddrawingdataset; 


　　//list if the caddrawingdataset exists 


　　console.writeline("does drawing exist: {0}" , cadlayer.caddrawingdataset.exists ); 


　　//list the caddrawingdataset filepath 


　　console.writeline("cad drawing path: {0}" , cadlayer.caddrawingdataset.filepath ); 


　　//list if the caddrawingdataset is 2d 


　　console.writeline("is drawing 2d?: {0}" , cadlayer.caddrawingdataset.is2d); 


　　//list if the caddrawingdataset is 3d 


　　console.writeline("is drawing 3d?: {0}" , cadlayer.caddrawingdataset.is3d ); 


　　//list if the caddrawingdataset is an autocad drawing file 


　　console.writeline("is drawing from autocad?: {0}" , cadlayer.caddrawingdataset.isautocad ); 


　　//list if the caddrawingdataset is an microsation drawing file 


　　console.writeline("is drawing from microstation?: {0}" , cadlayer.caddrawingdataset.isdgn); }


　　中間過程實驗程式碼：


　　實驗1


　　public static string addcadlayer(map map1, toc toc)


　　{


　　// 得到伺服器上下文物件


　　mapfunctionality agsmapfunctionlity = map1.getfunctionality(1) as mapfunctionality;


　　mapresourcelocal localmapresource = (mapresourcelocal)agsmapfunctionlity.resource;


　　esri.arcgis地理資訊系統 .server.iservercontext mapcontext = localmapresource.servercontextinfo.servercontext;


　　//// 增加圖層


　　//esri.arcgis地理資訊系統 .carto.featurelayer pfeaturelayer = null;


　　//ifeaturelayer pfeaturelayer;


　　//開啟cad資料集


　　iworkspacefactory factory = (iworkspacefactory)mapcontext.createobject("esridatasourcesfile.cadworkspacefactory");


　　//pworkspacefactory = new cadworkspacefactoryclass();


　　//pworkspacefactory = new pworkspacefactory();


　　esri.arcgis地理資訊系統 .datasourcesfile.icaddrawingworkspace pfeatureworkspace = (esri.arcgis地理資訊系統 .datasourcesfile.icaddrawingworkspace)factory.openfromfile(@"c:\inetpub\wwwroot\northamerica", 0);


　　//ifeatureworkspace pfeatureworkspace = (ifeatureworkspace)factory.openfromfile(@"c:\inetpub\wwwroot\northamerica", 0);


　　//開啟一個要素集


　　esri.arcgis地理資訊系統 .datasourcesfile.icaddrawingdataset pfeaturedataset = (esri.arcgis地理資訊系統 .datasourcesfile.icaddrawingdataset)pfeatureworkspace.opencaddrawingdataset("new_shapefile_exportcad.dwg");


　　//ifeaturclasscontainer可以管理ifeaturedataset中的每個要素類


　　esri.arcgis地理資訊系統 .carto.icadlayer pfeatureclasscontainer = new esri.arcgis地理資訊系統 .carto.cadlayerclass();


　　pfeatureclasscontainer.caddrawingdataset = pfeaturedataset;


　　//ifeatureclasscontainer pfeatureclasscontainer = (ifeatureclasscontainer)pfeaturedataset;


　　//對cad檔案中的要素進行遍歷處理


　　//for (int i = 0; i < pfeatureclasscontainer.classcount - 1; i++)


　　//{


　　// ifeatureclass pfeatureclass = pfeatureclasscontainer.get_class(i);


　　// if (pfeatureclass.featuretype == esrifeaturetype.esriftannotation)


　　// {


　　// //如果是註記，則添加註記層


　　// pfeaturelayer = (esri.arcgis地理資訊系統 .carto.featurelayer)mapcontext.createobject("esricarto.cadannotationlayerclass");


　　// }


　　// else//如果是點、線、面，則新增要素層


　　// {


　　// pfeaturelayer = (esri.arcgis地理資訊系統 .carto.featurelayer)mapcontext.createobject("esricarto.cadfeaturelayer");


　　// pfeaturelayer.name = pfeatureclass.aliasname;


　　// }


　　//}


　　esri.arcgis地理資訊系統 .carto.imapserverobjects mapserverobjects = localmapresource.mapserver as esri.arcgis地理資訊系統 .carto.imapserverobjects;


　　esri.arcgis地理資訊系統 .carto.imap map = mapserverobjects.get_map(localmapresource.dataframe) as esri.arcgis地理資訊系統 .carto.imap;


　　//if (pfeaturelayer != null)


　　//{


　　map.addlayer(pfeatureclasscontainer);


　　// //map.movelayer(pfeaturelayer, map.layercount - 1);


　　//}


　　//重新整理伺服器物件，響應新增圖層


　　localmapresource.refreshserverobjects();


　　//toc控制元件重新整理


　　toc.refresh();


　　map1.callbackresults.copyfrom(toc.callbackresults);


　　map1.refresh();


　　return map1.callbackresults.tostring();


　　}


　　實驗2


　　public static string addcadlayer2(map map1, toc toc)


　　{


　　// 得到伺服器上下文物件


　　mapfunctionality agsmapfunctionlity = map1.getfunctionality(1) as mapfunctionality;


　　mapresourcelocal localmapresource = (mapresourcelocal)agsmapfunctionlity.resource;


　　esri.arcgis地理資訊系統 .server.iservercontext mapcontext = localmapresource.servercontextinfo.servercontext;


　　// 增加圖層


　　esri.arcgis地理資訊系統 .carto.ifeaturelayer pfeaturelayer = null;


　　//ifeaturelayer pfeaturelayer;


　　//開啟cad資料集


　　iworkspacefactory factory = (iworkspacefactory)mapcontext.createobject("esridatasourcesfile.cadworkspacefactory");


　　//pworkspacefactory = new cadworkspacefactoryclass();


　　//pworkspacefactory = new pworkspacefactory();


　　ifeatureworkspace pfeatureworkspace = (ifeatureworkspace)factory.openfromfile(@"c:\inetpub\wwwroot\northamerica", 0);


　　//開啟一個要素集


　　ifeaturedataset pfeaturedataset = (ifeaturedataset)pfeatureworkspace.openfeaturedataset("new_shapefile_exportcad.dwg");


　　//ifeaturclasscontainer可以管理ifeaturedataset中的每個要素類


　　ifeatureclasscontainer pfeatureclasscontainer = (ifeatureclasscontainer)pfeaturedataset;


　　//對cad檔案中的要素進行遍歷處理


　　for (int i = 0; i < pfeatureclasscontainer.classcount - 3; i++)


　　{


　　ifeatureclass pfeatureclass = pfeatureclasscontainer.get_class(i);


　　if (pfeatureclass.featuretype == esrifeaturetype.esriftannotation)


　　{


　　//如果是註記，則添加註記層


　　pfeaturelayer = (esri.arcgis地理資訊系統 .carto.ifeaturelayer)mapcontext.createobject("esricarto.cadannotationlayerclass");


　　//pfeaturelayer = new cadannotationlayerclass();


　　}


　　else//如果是點、線、面，則新增要素層


　　{


　　pfeaturelayer = (esri.arcgis地理資訊系統 .carto.ifeaturelayer)mapcontext.createobject("esricarto.cadfeaturelayer");


　　pfeaturelayer.name = pfeatureclass.aliasname;


　　pfeaturelayer.featureclass = pfeatureclass;


　　esri.arcgis地理資訊系統 .carto.igeofeaturelayer iglayer = (esri.arcgis地理資訊系統 .carto.igeofeaturelayer)pfeaturelayer;


　　esri.arcgis地理資訊系統 .carto.isimplerenderer isr = (esri.arcgis地理資訊系統 .carto.isimplerenderer)mapcontext.createobject("esricarto.simplerenderer");


　　esri.arcgis地理資訊系統 .display.irgbcolor irgbc = (esri.arcgis地理資訊系統 .display.irgbcolor)mapcontext.createobject("esridisplay.rgbcolor");


　　irgbc.red = 255;


　　irgbc.green = 0;


　　irgbc.blue = 0;


　　esri.arcgis地理資訊系統 .geometry.esrigeometrytype featype = pfeaturelayer.featureclass.shapetype;


　　if (featype == esri.arcgis地理資訊系統 .geometry.esrigeometrytype.esrigeometrypoint)


　　{


　　esri.arcgis地理資訊系統 .display.isimplemarkersymbol ifs = (esri.arcgis地理資訊系統 .display.isimplemarkersymbol)mapcontext.createobject("esridisplay.simplemarkersymbol");


　　ifs.color = (esri.arcgis地理資訊系統 .display.icolor)irgbc;


　　isr.symbol = (esri.arcgis地理資訊系統 .display.isymbol)ifs;


　　}


　　else if (featype == esri.arcgis地理資訊系統 .geometry.esrigeometrytype.esrigeometrypolyline)


　　{


　　esri.arcgis地理資訊系統 .display.isimplelinesymbol ifs = (esri.arcgis地理資訊系統 .display.isimplelinesymbol)mapcontext.createobject("esridisplay.simplelinesymbol");


　　ifs.color = (esri.arcgis地理資訊系統 .display.icolor)irgbc;


　　isr.symbol = (esri.arcgis地理資訊系統 .display.isymbol)ifs;


　　}


　　else if (featype == esri.arcgis地理資訊系統 .geometry.esrigeometrytype.esrigeometrypolygon)


　　{


　　esri.arcgis地理資訊系統 .display.isimplefillsymbol ifs = (esri.arcgis地理資訊系統 .display.isimplefillsymbol)mapcontext.createobject("esridisplay.simplefillsymbol");


　　ifs.color = (esri.arcgis地理資訊系統 .display.icolor)irgbc;


　　isr.symbol = (esri.arcgis地理資訊系統 .display.isymbol)ifs;


　　}


　　else


　　{


　　esri.arcgis地理資訊系統 .display.isimplelinesymbol ifs = (esri.arcgis地理資訊系統 .display.isimplelinesymbol)mapcontext.createobject("esridisplay.simplelinesymbol");


　　ifs.color = (esri.arcgis地理資訊系統 .display.icolor)irgbc;


　　isr.symbol = (esri.arcgis地理資訊系統 .display.isymbol)ifs;


　　//throw new exception("圖層型別不確定！");


　　}


　　iglayer.renderer = (esri.arcgis地理資訊系統 .carto.ifeaturerenderer)isr;


　　//imapserver ms = (imapserver)in_mapcontext.serverobject;


　　//imapserverobjects2 mso = (imapserverobjects2)ms;


　　//string mapname = ms.defaultmapname;


　　//imap map = mso.get_map(mapname);


　　//map.addlayer(pfeaturelayer);


　　//mso.refreshserverobjects();


　　}


　　}


　　//// 從上下文物件中得到伺服器物件


　　//imapserver ms = (imapserver)mapcontext.serverobject;


　　//imapserverinfo mapinfo = ms.getserverinfo(ms.defaultmapname);


　　//imapdescription newmapdesc = mapinfo.defaultmapdescription;


　　//// 釋放伺服器上下文物件


　　//mapcontext.releasecontext();


　　esri.arcgis地理資訊系統 .carto.imapserverobjects mapserverobjects = localmapresource.mapserver as esri.arcgis地理資訊系統 .carto.imapserverobjects;


　　esri.arcgis地理資訊系統 .carto.imap map = mapserverobjects.get_map(localmapresource.dataframe) as esri.arcgis地理資訊系統 .carto.imap;


　　if (pfeaturelayer != null)


　　{


　　map.addlayer(pfeaturelayer);


　　//移動層到底層


　　//map.movelayer(pfeaturelayer, map.layercount - 1);


　　}


　　//重新整理伺服器物件，響應新增圖層


　　localmapresource.refreshserverobjects();


　　//toc控制元件重新整理


　　toc.refresh();


　　map1.callbackresults.copyfrom(toc.callbackresults);


　　map1.refresh();


　　return map1.callbackresults.tostring();


　　}


　　最終除錯正確程式碼：


　　public static string addcadlayer(map map1, toc toc)


　　{


　　// 得到伺服器上下文物件


　　mapfunctionality agsmapfunctionlity = map1.getfunctionality(1) as mapfunctionality;


　　mapresourcelocal localmapresource = (mapresourcelocal)agsmapfunctionlity.resource;


　　esri.arcgis地理資訊系統 .server.iservercontext mapcontext = localmapresource.servercontextinfo.servercontext;


　　// 增加圖層


　　esri.arcgis地理資訊系統 .carto.ifeaturelayer pfeaturelayer = null;


　　//開啟cad資料集


　　iworkspacefactory factory = (iworkspacefactory)mapcontext.createobject("esridatasourcesfile.cadworkspacefactory");


　　ifeatureworkspace pfeatureworkspace = (ifeatureworkspace)factory.openfromfile(@"c:\inetpub\wwwroot\northamerica", 0);


　　//開啟一個要素集


　　ifeaturedataset pfeaturedataset = (ifeaturedataset)pfeatureworkspace.openfeaturedataset("new_shapefile_exportcad.dwg");


　　//ifeaturclasscontainer可以管理ifeaturedataset中的每個要素類


　　ifeatureclasscontainer pfeatureclasscontainer = (ifeatureclasscontainer)pfeaturedataset;


　　//對cad檔案中的要素進行遍歷處理


　　for (int i = 0; i < pfeatureclasscontainer.classcount - 1; i++)


　　{


　　ifeatureclass pfeatureclass = pfeatureclasscontainer.get_class(i);


　　if (pfeatureclass.featuretype == esrifeaturetype.esriftannotation)


　　{


　　//如果是註記，則添加註記層


　　pfeaturelayer = (esri.arcgis地理資訊系統 .carto.ifeaturelayer)mapcontext.createobject("esricarto.cadannotationlayerclass");


　　}


　　else//如果是點、線、面，則新增要素層


　　{


　　pfeaturelayer = (esri.arcgis地理資訊系統 .carto.ifeaturelayer)mapcontext.createobject("esricarto.cadfeaturelayer");


　　pfeaturelayer.name = pfeatureclass.aliasname;


　　pfeaturelayer.featureclass = pfeatureclass;


　　esri.arcgis地理資訊系統 .carto.imapserverobjects mapserverobjects = localmapresource.mapserver as esri.arcgis地理資訊系統 .carto.imapserverobjects;


　　esri.arcgis地理資訊系統 .carto.imap map = mapserverobjects.get_map(localmapresource.dataframe) as esri.arcgis地理資訊系統 .carto.imap;


　　map.addlayer(pfeaturelayer);


　　//重新整理伺服器物件，響應新增圖層


　　localmapresource.refreshserverobjects();


　　}


　　}


　　//toc控制元件重新整理


　　toc.refresh();


　　map1.callbackresults.copyfrom(toc.callbackresults);


　　map1.refresh();


　　return map1.callbackresults.tostring();


　　}