C#进行MapX二次开发之图层操作

     ///   <summary>
     ///  在.net中用ADO.NET取代了ADO实现对数据的访问，但一些COM控件只支持ADO并不支持ADO.NET。
     ///  为了使用这类控件，只能将ADO.NET中的数据对象，比如转换DataTable为ADO中的Recordset
     ///  （DataSet对象本质上是DataTable的集合，因此本文只讲述DataTable对象的转换）。
     ///   </summary>
     public   sealed   class  ADONETtoADO
    {
         ///   <summary>
         ///  将DataTable对象转换为Recordeset对象
         ///   </summary>
         ///   <param name="table"> DataTable对象 </param>
         ///   <returns> 转换后得到的Recordeset对象 </returns>
         public   static  Recordset ConvertDataTableToRecordset(DataTable table)
        {
             // 思路：
             //  1. 创建Recordset对象后，在其中对应DataTable的Column创建Field，为此需要将ADO.NET的数据类型转换为ADO的数据类型；
             //  2. 打开Recordset对象，对应DataTable对象中的每一行，在Recordset对象中新建一条记录，并对每个字段赋值。

            Recordset rs  =   new  RecordsetClass();
             foreach  (DataColumn dc  in  table.Columns)
            {
                rs.Fields.Append(dc.ColumnName, GetDataType(dc.DataType),  - 1 , FieldAttributeEnum.adFldIsNullable, Missing.Value);
            }

            rs.Open(Missing.Value, Missing.Value, CursorTypeEnum.adOpenUnspecified, LockTypeEnum.adLockUnspecified,  - 1 );
             foreach  (DataRow dr  in  table.Rows)
            {
                rs.AddNew(Missing.Value, Missing.Value);  object  o;
                 for  ( int  i  =   0 ; i  <  table.Columns.Count; i ++ )
                {
                    rs.Fields[i].Value  =  dr[i];
                    o  =  rs.Fields[i].Value;
                }
            }

             return  rs;
        }

         ///   <summary>
         ///  将ADO.NET的数据类型转换为ADO的数据类型
         ///   </summary>
         ///   <param name="dataType"> ADO.NET的数据类型 </param>
         ///   <returns> ADO的数据类型 </returns>
         private   static  DataTypeEnum GetDataType(Type dataType)
        {
             switch  (dataType.ToString())
            {
                 case   " System.Boolean " :  return  DataTypeEnum.adBoolean;
                 case   " System.Byte " :  return  DataTypeEnum.adUnsignedTinyInt;
                 case   " System.Char " :  return  DataTypeEnum.adChar;
                 case   " System.DateTime " :  return  DataTypeEnum.adDate;
                 case   " System.Decimal " :  return  DataTypeEnum.adDecimal;
                 case   " System.Double " :  return  DataTypeEnum.adDouble;
                 case   " System.Int16 " :  return  DataTypeEnum.adSmallInt;
                 case   " System.Int32 " :  return  DataTypeEnum.adInteger;
                 case   " System.Int64 " :  return  DataTypeEnum.adBigInt;
                 case   " System.SByte " :  return  DataTypeEnum.adTinyInt;
                 case   " System.Single " :  return  DataTypeEnum.adSingle;
                 case   " System.String " :  return  DataTypeEnum.adVarChar;
                 // case "TimeSpan":return DataTypeEnum.
                 case   " System.UInt16 " :  return  DataTypeEnum.adUnsignedSmallInt;
                 case   " System.UInt32 " :  return  DataTypeEnum.adUnsignedInt;
                 case   " System.UInt64 " :  return  DataTypeEnum.adUnsignedBigInt;
                 default :  throw  ( new  Exception( " 没有对应的数据类型 " ));
            }
        }
    }

         ///   <summary>
         ///  删除所有的图层数据
         ///   </summary>
         ///   <param name="layerName"></param>
         private   void  DeleteLayerByName( string  layerName)
        {
             // Layer的序号是从1开始
             int  count  =  axMap1.Layers.Count;  
             for  ( int  i  =   1 ; i  <  count; i ++ ) 
            {
                 if  (axMap1.Layers[i].Name  ==  layerName)
                {
                    axMap1.Layers.Remove(i);
                }
            }
        }

         ///   <summary>
         ///  创建新的图层信息
         ///   </summary>
         ///   <param name="layerName"></param>
         ///   <param name="rsNoPass"></param>
         private   void  CreatNewLayerfromDB( string  layerName, ADODB.Recordset rsNoPass)
        {
            DeleteLayerByName(layerName);  // 将原有层删除
            CMapXFields flds  =   new  FieldsClass();

             //  Describe the structure of the Unbound dataset
            flds.Add( " stationid " ,  " theid " , AggregationFunctionConstants.miAggregationIndividual,
                   FieldTypeConstants.miTypeString);
            flds.Add( " address " ,  " address " , AggregationFunctionConstants.miAggregationIndividual,
                   FieldTypeConstants.miTypeString);
            flds.Add( " longitude " ,  " longitude " , AggregationFunctionConstants.miAggregationSum,
                   FieldTypeConstants.miTypeNumeric);   // 经度
            flds.Add( " latitude " ,  " latitude " , AggregationFunctionConstants.miAggregationSum,
                   FieldTypeConstants.miTypeNumeric);   // 纬度

            CMapXBindLayer bindLayerObject  =   new  BindLayerClass();
            bindLayerObject.LayerName  =  layerName;
            bindLayerObject.RefColumn1  =   3 ;
            bindLayerObject.RefColumn2  =   4 ;
            bindLayerObject.LayerType  =  BindLayerTypeConstants.miBindLayerTypeXY;

            CMapXDataset dataSet  =  axMap1.DataSets.Add(DatasetTypeConstants.miDataSetADO, rsNoPass, layerName,  " stationid " ,  " address " , bindLayerObject, flds,  false );
            CMapXLayer layer  =  axMap1.Layers._Item(layerName);

            layer.OverrideStyle  =   true ;
             string  picName  =   " icon.BMP " ;
             if  (layer.Style.SupportsBitmapSymbols  ==   true )
            {
                layer.Style.SymbolType  =  SymbolTypeConstants.miSymbolTypeBitmap;
                layer.Style.SymbolBitmapSize  =   60 ;
                layer.Style.SymbolBitmapTransparent  =   true ;
                layer.Style.SymbolBitmapName  =  picName;
            }
        }