做简单的地图展示,不需要专业的GIS组件,使用DevExpress即可完成,以加载Shp地图文件为例:
private void LoadShp(string path)
{
//创建SHP数据源
ShapefileDataAdapter dataAdapter = new ShapefileDataAdapter
{
FileUri = new Uri(path),
SourceCoordinateSystem = new CartesianSourceCoordinateSystem(), //坐标系
DefaultEncoding = Encoding.UTF8, //编码
};
//创建矢量图层
VectorItemsLayer vectorItemsLayer = new VectorItemsLayer
{
Data = dataAdapter,
Colorizer = CreateChoroplethColorizer("SCP") //分级符号化
};
vectorItemsLayer.Name = "任务区";
//标注
vectorItemsLayer.ShapeTitlesVisibility = VisibilityMode.Visible;
vectorItemsLayer.ShapeTitlesPattern = "{Name}:{ SCP }%";
//设置地图控件属性
this.mapControl1.CoordinateSystem = new CartesianMapCoordinateSystem();
this.mapControl1.NavigationPanelOptions.Visible = false;
//加载图层
mapControl1.Layers.Add(vectorItemsLayer);
//加载图例
MapLegendBase mapLegendBase = CreateLegend(vectorItemsLayer);
mapLegendBase.Alignment = LegendAlignment.TopLeft;
this.mapControl1.Legends.Add(mapLegendBase);
}
需要注意的问题:
(1)正确设置ShapefileDataAdapter和mapControl的坐标系统CoordinateSystem,否则无法显示;
(2)当标注用到包含中文的属性时会乱码,需设置DataAdapter的默认编码属性DefaultEncoding;
(3)标注使用图层的ShapeTitlesPattern属性,它是一个字符串,对于引用的字段,需加上中括号,例如"{Name}"表示用属性表中Name来标注 ;
(4)也支持图例、符号化等基本地图概念。