GMap.NET是一個.net控件，開源、跨平臺、免費。地圖來源廣泛。可以用于WinForm、WPF、WM。

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要使用這個控件，就必須理解以下幾點：

1. What is the?map control?(GMapControl)? This is the control which renders the map.?

2. What is an?Overlay?(GMapOverlay)? This is a layer on top of the map control. You can have several layers on top of a map, each layer representing, say, a route with stops, a list of stores etc.

3. What are?Markers?(GMapMarker)? These are the points on a layer, each representing a specific geo location (Lat,Lon) e.g. each drop point on a route.

4. What is a?route?(GMapRoute)? This is the path or direction between two or more points.

5. WTF are tiles? – well here is something to read…Bing Maps Tile System.

1.向Windows Form添加一個GMap控件

直接把控件從工具箱拖到form上，調(diào)整大小，然后把默認(rèn)名字GMapControl1改為gmap

選擇控件，選擇屬性，打開屬性面板，除了控件的通用屬性外，還有GMap特定的屬性，

CanDragMap-----鼠標(biāo)右鍵拖動地圖

MarkersEnabled---顯示markers

PolygonsEnabled---顯示polygon

ShowTileGridLines---顯示坐標(biāo)格網(wǎng)

Zoom, MinZoom, MaxZoom---Google地圖的縮放水平從0-18，0是全球范圍，18是街道級別，全國級別的話，zoom設(shè)為5比較合適。

2.初始化地圖

給form添加一個onLoad事件，寫入如下代碼：

有如下四種方式設(shè)置地圖的默認(rèn)位置：

gmap.SetCurrentPositionByKeywords(“country”) - USA

gmap.SetCurrentPositionByKeywords(“state, country”) – Berlin, Germany

gmap.SetCurrentPositionByKeywords(“province, country”) – Alberta, Canada

?

CloudMadeMapProvider

GoogleMapProvider – map provider for Google Maps;有很多種類型的地圖

OpenCycleMapProvider

OpenStreetMapProvider

WikiMapiaMapProvider

YahooMapProvider