mapxtreme pitney_arcgis engine安装教程_mapxtreme

在MapXtreme 2005中，查找图元提供了非常多的方法，也非常容易实现，这里总结了三种方法。

（1）Search方法是非常强大的，可以实现几乎所有的查找，这也是最常用的查找方式。mapxtrememapxtreme示例代码如下：

/**////<summary>

///通过Search方法查找图元

///DesignbyGlacier

///2008年8月6日

///<paramname="tableName">查找的表名</param>

///<paramname="columnName">查找的列名</param>

///<paramname="strKey">查找的关键字</param>

///</summary>

publicstaticvoidSearchWithSearch(stringtableName,stringcolumnName,stringstrKey)

{

MapInfo.Mapping.Mapmap=MapInfo.Engine.Session.Current.MapFactory[MapControl1.MapAlias];

SearchInfosi=MapInfo.Data.SearchInfoFactory.SearchWhere(columnName+"like'%"+strKey+"%'");

IResultSetFeatureCollectionifs=MapInfo.Engine.Session.Current.Catalog.Search(tableName,si);

MapInfo.Engine.Session.Current.Selections.DefaultSelection.Clear();

if(ifs.Count<=0)

{

lbSearch.Text="Cannotfindthepoint";

}

else

{

//高亮显示

MapInfo.Engine.Session.Current.Selections.DefaultSelection.Add(ifs);

lbSearch.Text="";

if(ifs.Count==1)

{

map.Center=newDPoint(ifs[0].Geometry.Centroid.x,ifs[0].Geometry.Centroid.y);

MapInfo.Geometry.Distanced=newMapInfo.Geometry.Distance(0.5,map.Zoom.Unit);

}

else

{

map.SetView(ifs.Envelope);

}

//设置高亮显示的样式

//((SimpleInterior)MapInfo.Engine.Session.Current.Selections.DefaultSelection.Style.AreaStyle.Interior).BackColor=System.Drawing.Color.Red;

//((SimpleInterior)MapInfo.Engine.Session.Current.Selections.DefaultSelection.Style.AreaStyle.Interior).ForeColor=System.Drawing.Color.Green;

//输出查询信息

ListBox1.Items.Clear();

foreach(Featurefeatureinifs)

{

ListBox1.Items.Add(feature["name"].ToString());

}

}

}

（2）通过构造Find对象，进行查找。示例代码如下：

/**////<summary>

///通过Find查找图元

///DesignbyGlacier

///2008年8月6日

///<paramname="layerName">查找的图层名</param>

///<paramname="columnName">查找的列名</param>

///<paramname="strKey">查找的关键字</param>

///</summary>

publicstaticvoidSearchWithFind(stringlayerName,stringcolumnName,stringstrKey)

{

Findfind=null;

MapInfo.Mapping.Mapmap=MapInfo.Engine.Session.Current.MapFactory[MapControl1.MapAlias];

//Dothefind

MapInfo.Mapping.FeatureLayerfindLayer=(MapInfo.Mapping.FeatureLayer)map.Layers[PointLayerName];

find=newFind(findLayer.Table,findLayer.Table.TableInfo.Columns[columnName]);

FindResultfindResult=find.Search(strFind);

if(findResult.ExactMatch)

{

//Setthemap'scenterandzoom

map.Center=newDPoint(findResult.FoundPoint.X,findResult.FoundPoint.Y);

MapInfo.Geometry.Distanced=newMapInfo.Geometry.Distance(2,map.Zoom.Unit);

map.Zoom=d;

lbSearch.Text="";

}

else

{

lbSearch.Text="CannotfindthePoint";

}

find.Dispose();

}

（3）能过构造Sql语句进行查找，示例代码如下：

/**////<summary>

///通过Sql语句查找图元

///DesignbyGlacier

///2008年8月6日

///<paramname="tableName">查找的表名</param>

///<paramname="columnName">查找的列名</param>

///<paramname="strKey">查找的关键字</param>

///</summary>

publicstaticvoidSearchWithSql(stringtableName,stringcolumnName,stringstrKey)

{

MapInfo.Data.MIConnectionmiConnection=newMIConnection();

miConnection.Open();

MapInfo.Data.MICommandmiCommand=miConnection.CreateCommand();

miCommand.CommandText="select*from"+tableName+"where"+columnName+"like'%'+@name+'%'";

miCommand.Parameters.Add("@name",strKey);

IResultSetFeatureCollectionifs=miCommand.ExecuteFeatureCollection();

MapInfo.Engine.Session.Current.Selections.DefaultSelection.Clear();

MapInfo.Mapping.MapmyMap=MapInfo.Engine.Session.Current.MapFactory[MapControl1.MapAlias];

if(ifs.Count<=0)

{

lbSearch.Text="Cannotfindthepoint";

}

else

{

//高亮显示

lbSearch.Text="";

MapInfo.Engine.Session.Current.Selections.DefaultSelection.Add(ifs);

if(ifs.Count==1)

{

myMap.Center=newDPoint(ifs[0].Geometry.Centroid.x,ifs[0].Geometry.Centroid.y);

MapInfo.Geometry.Distanced=newMapInfo.Geometry.Distance(0.5,myMap.Zoom.Unit);

myMap.Zoom=d;

}

else

{

myMap.SetView(ifs.Envelope);

}

}

}

本文来自电脑杂谈，转载请注明本文网址：
http://www.pc-fly.com/a/tongxinshuyu/article-28344-1.html