在 dotNet 调用 MapInfo 应用程序处理特殊问题

  MapInfo系列产品的一个特点就是便于二次开发和集成，比如MapX，和现在dotNet环境下的MapXtreme2004，还有Java环境下的MapXtreme等
 不过功能最强的还是MapInfo这个平台本身，比如MapInfo的一些方法在MapX中没有提供，这时候就可以用基于MapInfo OLE 的这种方法，把
 MapInfo.exe 嵌入到程序中。下面的这个类可以通过dotNet环境直接调用MapInfo的功能，如果结合相对应的MapBasic的程序，功能更强。
 比如CreateGrid这个方法实现的功能，MapX，MapXtreme2004都无法生成。

     ///   <summary>
     ///  MapInfoApplication Class
     ///   </summary>
     public   class  MapInfoApplication
    {
         private  MapInfoApplication()
        {}

        //静态构造函数创建MapInfo应用程序实例
         static  MapInfoApplication(){
             if (mapInfo  ==   null ){
                mapInfoType  =  Type.GetTypeFromProgID( " MapInfo.Application " );
                mapInfo  =  System.Activator.CreateInstance(mapInfoType);
                Do( " Set ProgressBars off " );
            }
        }
         private   static  Type   mapInfoType;
         private   static   object  mapInfo;
         private   static   object [] parameter =   new   object [ 1 ]; 
         private   static   string  strCMD  =   string .Empty;

         // MapInfo do function
         public   static   void  Do( string  command){
            parameter[ 0 ]  =  command;
            mapInfoType.InvokeMember( " do " ,BindingFlags.InvokeMethod, null ,mapInfo,parameter);
        }
        
        //MapInfo eval function
         public   static   string  Eval( string  command){
            parameter[ 0 ]  =  command;
             return  ( string )mapInfoType.InvokeMember( " eval " ,BindingFlags.InvokeMethod, null ,mapInfo,parameter);
        }

         public   static   bool  CreateGrid( string  PointTableFile, string  GridTableFile /*  type is *.mig  */ ){
             try {
                 string  tableName  =  OpenTable(PointTableFile);
                 if (tableName  ==   string .Empty)
                     throw   new  Exception( " 打开  "   +  PointTableFile  +   "  错误！ " );
                strCMD     =      "  create grid from  "   +  tableName  +   "  with price into \ ""  + GridTableFile +  " \ "  type \ " mig.ghl\ "   " ;
                strCMD  +=   "  CoordSys NonEarth Units \ " m\ "  Bounds (-294432301.819, -294234040.53) (294631503.779, 294829765.067)   " ;
                strCMD  +=   "  inflect 5 by percent at RGB(0, 0, 255) : 0 RGB(0, 255, 255) : 25 RGB(0, 255, 0) : 50 RGB(255, 255, 0) : 75 RGB(255, 0, 0) : 100   " ;
                strCMD  +=   "  round 10 # use 2 # cell min 601  " ;
                strCMD  +=   " interpolate with \ " IDW\ "  version \ " 100 \ "  using 7  " ;
                strCMD  +=   "  \ " AGGREGATION METHOD\ " :  \ " 0 \ "   " ;
                strCMD  +=   "  \ " BORDER\ " :  \ " 0 \ "   " ;
                strCMD  +=   "  \ " CELL SIZE\ " :  \ " 1 \ "   " ;
                strCMD  +=   "  \ " EXPONENT\ " :  \ " 2 \ "   " ;
                strCMD  +=   "  \ " MAX POINTS\ " :  \ " 25 \ "   " ;
                strCMD  +=   "  \ " MIN POINTS\ " :  \ " 1 \ "   " ;
                strCMD  +=   "  \ " SEARCH RADIUS\ " :  \ " 300 \ "   " ;
                MapInfoApplication.Do(strCMD);
            }
             catch (System.Exception){
                 return   false ;
            } finally {
                CloseAll();
            }
            
             return   true ;
        }

         public   static   string  OpenTable( string  tableFile){
             try {
                strCMD  =   " Open Table \ ""  + tableFile + " \ "" ;
                Do(strCMD);
            } catch (System.Exception){
                 return   string .Empty;
            }
             return  System.IO.Path.GetFileNameWithoutExtension(tableFile);
        }

         public   static   void  CloseAll(){
            Do( " Close All " );
        }
        


    }