MapInfo 开发实例：基础操作示例

一、创建图层

1. 创建图层函数代码：CreateLayer

public static void CreateLayer(string tableName, string layerName){    MapInfo.Mapping.Map myMap = MapInfo.Engine.Session.Current.MapFactory[0];    MapInfo.Mapping.FeatureLayer myLayer = new MapInfo.Mapping.FeatureLayer(table, layerName, layerName);    myMap.Layers.Add(myLayer);}

2. 添加点函数代码：AddPoint

public static void AddPoint(string layerName, DPoint dPoint, short shortCode, Color color){    MapInfo.Mapping.Map myMap = MapInfo.Engine.Session.Current.MapFactory[0];    FeatureLayer workLayer = myMap.Layers[layerName];    FeatureGeometry point = new FeatureGeometry(workLayer.CoordSys, dPoint);    // 设置样式    Style style = new SimpleVectorPointStyle(shortCode, color, 20);    CompositeStyle compositeStyle = new CompositeStyle(style);    // 添加点    Feature pointRow = new Feature(table.TableInfo.Columns);    pointRow.Geometry = point;    pointRow.Style = compositeStyle;    pointRow["index"] = Random().Next(999);    pointRow["value"] = "这是一个点";    table.InsertFeature(pointRow);}

3. 添加线函数代码：AddLine

public static void AddLine(string layerName, DPoint startPoint, DPoint endPoint, short shortCode, Color color){    MapInfo.Mapping.Map myMap = MapInfo.Engine.Session.Current.MapFactory[0];    FeatureLayer workLayer = myMap.Layers[layerName];    FeatureGeometry line = MultiCurve.CreateLine(workLayer.CoordSys, startPoint, endPoint);    // 设置样式    Style lineStyle = new SimpleLineStyle(new LineWidth(3, LineWidthUnit.Pixel), shortCode, color);    CompositeStyle compositeStyle = new CompositeStyle(lineStyle);    // 添加线    Feature lineRow = new Feature(table.TableInfo.Columns);    lineRow.Geometry = line;    lineRow.Style = compositeStyle;    lineRow["index"] = Random().Next(999);    lineRow["value"] = "这是一个线";    table.InsertFeature(lineRow);}

二、显示标注文本

1. 显示标注函数代码：ShowValue

public static void ShowValue(string tableName, string columnName){    MapInfo.Mapping.Map myMap = MapInfo.Engine.Session.Current.MapFactory[0];    // 创建标注图层    LabelLayer labelLayer = new LabelLayer();    myMap.Layers.Add(labelLayer);    // 获取表    Table table = MapInfo.Engine.Session.Current.Catalog.GetTable(tableName);    // 绑定数据源    LabelSource source = new LabelSource(table);    // 设置显示的字段    source.DefaultLabelProperties.Caption = columnName;    // 添加到标注图层    labelLayer.Sources.Append(source);    // 加载数据    source.Load();    // 设置样式    source.DefaultLabelProperties.Visibility.Enabled = true;    source.DefaultLabelProperties.Visibility.VisibleRangeEnabled = true;    source.DefaultLabelProperties.Visibility.VisibleRange = new VisibleRange(0.01, 10, MapInfo.Geometry.DistanceUnit.Mile);    source.DefaultLabelProperties.Visibility.AllowDuplicates = true;    source.DefaultLabelProperties.Visibility.AllowOverlap = true;    source.DefaultLabelProperties.Visibility.AllowOutOfView = true;    // 设置字体样式    Font font = new Font("黑体", 12);    font.ForeColor = System.Drawing.Color.Red;    source.DefaultLabelProperties.Style.Font = font;}

三、使用命名空间

using MapInfo.Geometry;using MapInfo.Mapping;using MapInfo.Styles;using MapInfo.Data;using MapInfo.Text;using System.Drawing;

通过以上代码示例，可以快速实现MapInfo环境下的基础操作，包括图层的创建、几何对象的添加以及标注的显示。这些代码可以整合到一个类中，记得添加必要的命名空间声明。

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